# Seabridge Gold Provides Updated Mineral Resource Estimates for KSM Project Canonical Atlas analysis: https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870 Original source: https://money.tmx.com/en/quote/SEA/news/5585163029038340/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project Publisher: tmx Original announcement: 2026-03-31T11:30:00.000Z Analysis by Minestarters Atlas Atlas analysis published: Unknown date Atlas analysis updated: Unknown date - Company: Seabridge Gold Inc. - Ticker: SEA - Exchange: TSX - Region: British Columbia - Primary commodity: Gold - Secondary commodities: Copper, Silver, Molybdenum - Document categories: Resource update - Extracted: 2026-09-14 22:50:34 UTC Narrative sentiment: 0.10 · Bullish ## Minestarters Atlas summary Seabridge Gold announced updated Mineral Resource Estimates for its KSM Project in northwestern British Columbia, effective March 30, 2026. The update shows significant increases in contained gold, copper, silver, and molybdenum across Measured, Indicated, and Inferred categories. These increases are attributed to revised metal price assumptions and operating costs, with the underlying mineral resource model remaining unchanged, and the company states the changes are not considered material. Reasoning: Seabridge Gold's updated KSM Project mineral resource estimates show substantial increases in contained gold, copper, silver, and molybdenum across all categories. However, these increases are primarily due to revised metal price assumptions and operating costs rather than new geological data, and the company explicitly states the changes are not considered material. - Positive factor: contained\_metal\_growth - Positive factor: qp\_signed - Positive factor: ni\_43\_101\_compliant - Negative factor: stale\_estimate - Negative factor: dilutive\_growth Low confidence — this extraction should be reviewed alongside the original source. Facts used in scoring: 72 ## Classification and evidence No classification tags are available. ## Extracted facts Stored fact records: 72. Some facts used in scoring do not have a stored record. ## Resource Estimates (72) ### measured [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-0) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:07ee28f962f3af23f2ee - Deposit or zone: Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: measured - Tonnes: 700000000 - Grade: 0.67 - Grade Unit: g/t - Contained Metal: 15.1 - Contained Unit: moz - Cutoff Grade: 11.85 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: High-grade gold in a large Measured open-pit resource. Evidence · table > 0.67 Context: 700,000 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### measured [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-1) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:07ee28f962f3af23f2ee - Deposit or zone: Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: measured - Tonnes: 700000000 - Grade: 0.19 - Grade Unit: % - Contained Metal: 2932 - Contained Unit: mlb - Cutoff Grade: 11.85 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade copper in a large Measured open-pit resource. Evidence · table > 0.19 Context: 700,000 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### measured [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-2) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:07ee28f962f3af23f2ee - Deposit or zone: Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: measured - Tonnes: 700000000 - Grade: 3.26 - Grade Unit: g/t - Contained Metal: 73.4 - Contained Unit: moz - Cutoff Grade: 11.85 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade silver in a large Measured open-pit resource. Evidence · table > 3.26 Context: 700,000 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### measured [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-3) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:07ee28f962f3af23f2ee - Deposit or zone: Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: measured - Tonnes: 700000000 - Grade: 52 - Grade Unit: ppm - Contained Metal: 80 - Contained Unit: mlb - Cutoff Grade: 11.85 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade molybdenum in a large Measured open-pit resource. Evidence · table > 52 Context: 700,000 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### measured [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-4) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:a18b3f7fe0b842dad312 - Deposit or zone: East Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: measured - Tonnes: 1105000000 - Grade: 0.62 - Grade Unit: g/t - Contained Metal: 22 - Contained Unit: moz - Cutoff Grade: 12.35 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: High-grade gold in a very large Measured open-pit resource. Evidence · table > 0.62 Context: 1,105,000 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### measured [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-5) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:a18b3f7fe0b842dad312 - Deposit or zone: East Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: measured - Tonnes: 1105000000 - Grade: 0.11 - Grade Unit: % - Contained Metal: 2680 - Contained Unit: mlb - Cutoff Grade: 12.35 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade copper in a very large Measured open-pit resource. Evidence · table > 0.11 Context: 1,105,000 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### measured [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-6) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:a18b3f7fe0b842dad312 - Deposit or zone: East Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: measured - Tonnes: 1105000000 - Grade: 1.78 - Grade Unit: g/t - Contained Metal: 63.2 - Contained Unit: moz - Cutoff Grade: 12.35 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a very large Measured open-pit resource. Evidence · table > 1.78 Context: 1,105,000 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### measured [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-7) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:a18b3f7fe0b842dad312 - Deposit or zone: East Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: measured - Tonnes: 1105000000 - Grade: 86 - Grade Unit: ppm - Contained Metal: 210 - Contained Unit: mlb - Cutoff Grade: 12.35 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Strong-grade molybdenum in a very large Measured open-pit resource. Evidence · table > 86 Context: 1,105,000 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### measured [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-8) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:b7b9c2b1a135bf94f8d2 - Deposit or zone: Total Measured - Mining method: open\_pit #### Resource Data - Category: measured - Tonnes: 1805000000 - Grade: 0.64 - Grade Unit: g/t - Contained Metal: 37.1 - Contained Unit: moz #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: High-grade gold in a very large Measured resource. Evidence · table > 0.64 Context: 1,805,000 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### measured [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-9) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:b7b9c2b1a135bf94f8d2 - Deposit or zone: Total Measured - Mining method: open\_pit #### Resource Data - Category: measured - Tonnes: 1805000000 - Grade: 0.14 - Grade Unit: % - Contained Metal: 5612 - Contained Unit: mlb #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade copper in a very large Measured resource. Evidence · table > 0.14 Context: 1,805,000 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### measured [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-10) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:b7b9c2b1a135bf94f8d2 - Deposit or zone: Total Measured - Mining method: open\_pit #### Resource Data - Category: measured - Tonnes: 1805000000 - Grade: 2.35 - Grade Unit: g/t - Contained Metal: 136.6 - Contained Unit: moz #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a very large Measured resource. Evidence · table > 2.35 Context: 1,805,000 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### measured [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-11) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:b7b9c2b1a135bf94f8d2 - Deposit or zone: Total Measured - Mining method: open\_pit #### Resource Data - Category: measured - Tonnes: 1805000000 - Grade: 73 - Grade Unit: ppm - Contained Metal: 290 - Contained Unit: mlb #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Strong-grade molybdenum in a very large Measured resource. Evidence · table > 73 Context: 1,805,000 #### Tags used in scoring **Measured Resource** Polarity: positive Definition: Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves. Why it applies: category is "measured" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-12) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:81fd0170754004a8454e - Deposit or zone: Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 1922000000 - Grade: 0.46 - Grade Unit: g/t - Contained Metal: 28.4 - Contained Unit: moz - Cutoff Grade: 11.85 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade gold in a very large Indicated open-pit resource. Evidence · table > 0.46 Context: 1,922,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-13) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:81fd0170754004a8454e - Deposit or zone: Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 1922000000 - Grade: 0.13 - Grade Unit: % - Contained Metal: 5508 - Contained Unit: mlb - Cutoff Grade: 11.85 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade copper in a very large Indicated open-pit resource. Evidence · table > 0.13 Context: 1,922,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-14) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:81fd0170754004a8454e - Deposit or zone: Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 1922000000 - Grade: 2.7 - Grade Unit: g/t - Contained Metal: 166.8 - Contained Unit: moz - Cutoff Grade: 11.85 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a very large Indicated open-pit resource. Evidence · table > 2.7 Context: 1,922,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-15) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:81fd0170754004a8454e - Deposit or zone: Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 1922000000 - Grade: 65 - Grade Unit: ppm - Contained Metal: 274 - Contained Unit: mlb - Cutoff Grade: 11.85 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Strong-grade molybdenum in a very large Indicated open-pit resource. Evidence · table > 65 Context: 1,922,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-16) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:3674a16bef730047fa40 - Deposit or zone: East Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 1069000000 - Grade: 0.36 - Grade Unit: g/t - Contained Metal: 12.4 - Contained Unit: moz - Cutoff Grade: 12.35 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade gold in a very large Indicated open-pit resource. Evidence · table > 0.36 Context: 1,069,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-17) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:3674a16bef730047fa40 - Deposit or zone: East Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 1069000000 - Grade: 0.08 - Grade Unit: % - Contained Metal: 1885 - Contained Unit: mlb - Cutoff Grade: 12.35 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade copper in a very large Indicated open-pit resource. Evidence · table > 0.08 Context: 1,069,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-18) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:3674a16bef730047fa40 - Deposit or zone: East Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 1069000000 - Grade: 1.5 - Grade Unit: g/t - Contained Metal: 52.9 - Contained Unit: moz - Cutoff Grade: 12.35 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a very large Indicated open-pit resource. Evidence · table > 1.5 Context: 1,069,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-19) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:3674a16bef730047fa40 - Deposit or zone: East Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 1069000000 - Grade: 73 - Grade Unit: ppm - Contained Metal: 172 - Contained Unit: mlb - Cutoff Grade: 12.35 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Strong-grade molybdenum in a very large Indicated open-pit resource. Evidence · table > 73 Context: 1,069,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-20) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:59d5380a3f1b58b14f36 - Deposit or zone: Sulphurets - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 477000000 - Grade: 0.53 - Grade Unit: g/t - Contained Metal: 8.1 - Contained Unit: moz - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade gold in a large Indicated open-pit resource. Evidence · table > 0.53 Context: 477,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-21) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:59d5380a3f1b58b14f36 - Deposit or zone: Sulphurets - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 477000000 - Grade: 0.2 - Grade Unit: % - Contained Metal: 2103 - Contained Unit: mlb - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade copper in a large Indicated open-pit resource. Evidence · table > 0.20 Context: 477,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-22) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:59d5380a3f1b58b14f36 - Deposit or zone: Sulphurets - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 477000000 - Grade: 1 - Grade Unit: g/t - Contained Metal: 15.3 - Contained Unit: moz - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a large Indicated open-pit resource. Evidence · table > 1.0 Context: 477,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-23) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:59d5380a3f1b58b14f36 - Deposit or zone: Sulphurets - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 477000000 - Grade: 50 - Grade Unit: ppm - Contained Metal: 53 - Contained Unit: mlb - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade molybdenum in a large Indicated open-pit resource. Evidence · table > 50 Context: 477,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-24) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:29740614b71ba1056778 - Deposit or zone: Kerr - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 396000000 - Grade: 0.21 - Grade Unit: g/t - Contained Metal: 2.7 - Contained Unit: moz - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade gold in a large Indicated open-pit resource. Evidence · table > 0.21 Context: 396,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-25) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:29740614b71ba1056778 - Deposit or zone: Kerr - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 396000000 - Grade: 0.38 - Grade Unit: % - Contained Metal: 3318 - Contained Unit: mlb - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Strong-grade copper in a large Indicated open-pit resource. Evidence · table > 0.38 Context: 396,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-26) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:29740614b71ba1056778 - Deposit or zone: Kerr - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 396000000 - Grade: 1.1 - Grade Unit: g/t - Contained Metal: 14 - Contained Unit: moz - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a large Indicated open-pit resource. Evidence · table > 1.1 Context: 396,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-27) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:29740614b71ba1056778 - Deposit or zone: Kerr - OP - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 396000000 - Grade: 4 - Grade Unit: ppm - Contained Metal: 4 - Contained Unit: mlb - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade molybdenum in a large Indicated open-pit resource. Evidence · table > 4 Context: 396,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-28) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:8ae57dc03b42a6c23923 - Deposit or zone: Kerr - UG - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 31000000 - Grade: 0.21 - Grade Unit: g/t - Contained Metal: 0.2 - Contained Unit: moz - Cutoff Grade: 20 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade gold in a small Indicated underground resource. Evidence · table > 0.21 Context: 31,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-29) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:8ae57dc03b42a6c23923 - Deposit or zone: Kerr - UG - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 31000000 - Grade: 0.4 - Grade Unit: % - Contained Metal: 273 - Contained Unit: mlb - Cutoff Grade: 20 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade copper in a small Indicated underground resource. Evidence · table > 0.40 Context: 31,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-30) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:8ae57dc03b42a6c23923 - Deposit or zone: Kerr - UG - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 31000000 - Grade: 1.5 - Grade Unit: g/t - Contained Metal: 1.5 - Contained Unit: moz - Cutoff Grade: 20 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a small Indicated underground resource. Evidence · table > 1.5 Context: 31,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-31) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:8ae57dc03b42a6c23923 - Deposit or zone: Kerr - UG - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 31000000 - Grade: 12 - Grade Unit: ppm - Contained Metal: 1 - Contained Unit: mlb - Cutoff Grade: 20 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade molybdenum in a small Indicated underground resource. Evidence · table > 12 Context: 31,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-32) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:7cbe423381c9810b65e6 - Deposit or zone: Iron Cap - UG - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 555000000 - Grade: 0.37 - Grade Unit: g/t - Contained Metal: 6.6 - Contained Unit: moz - Cutoff Grade: 18.5 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade gold in a large Indicated underground resource. Evidence · table > 0.37 Context: 555,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-33) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:7cbe423381c9810b65e6 - Deposit or zone: Iron Cap - UG - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 555000000 - Grade: 0.2 - Grade Unit: % - Contained Metal: 2447 - Contained Unit: mlb - Cutoff Grade: 18.5 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade copper in a large Indicated underground resource. Evidence · table > 0.20 Context: 555,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-34) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:7cbe423381c9810b65e6 - Deposit or zone: Iron Cap - UG - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 555000000 - Grade: 4.1 - Grade Unit: g/t - Contained Metal: 72.8 - Contained Unit: moz - Cutoff Grade: 18.5 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade silver in a large Indicated underground resource. Evidence · table > 4.1 Context: 555,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-35) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:7cbe423381c9810b65e6 - Deposit or zone: Iron Cap - UG - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 555000000 - Grade: 35 - Grade Unit: ppm - Contained Metal: 43 - Contained Unit: mlb - Cutoff Grade: 18.5 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade molybdenum in a large Indicated underground resource. Evidence · table > 35 Context: 555,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-36) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:9e5c23d0aff1e018e002 - Deposit or zone: Total Indicated - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 4450000000 - Grade: 0.41 - Grade Unit: g/t - Contained Metal: 58.4 - Contained Unit: moz #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade gold in a very large Indicated resource. Evidence · table > 0.41 Context: 4,450,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-37) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:9e5c23d0aff1e018e002 - Deposit or zone: Total Indicated - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 4450000000 - Grade: 0.16 - Grade Unit: % - Contained Metal: 15534 - Contained Unit: mlb #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade copper in a very large Indicated resource. Evidence · table > 0.16 Context: 4,450,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-38) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:9e5c23d0aff1e018e002 - Deposit or zone: Total Indicated - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 4450000000 - Grade: 2.3 - Grade Unit: g/t - Contained Metal: 323.3 - Contained Unit: moz #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a very large Indicated resource. Evidence · table > 2.3 Context: 4,450,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-39) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:9e5c23d0aff1e018e002 - Deposit or zone: Total Indicated - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 4450000000 - Grade: 56 - Grade Unit: ppm - Contained Metal: 547 - Contained Unit: mlb #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Strong-grade molybdenum in a very large Indicated resource. Evidence · table > 56 Context: 4,450,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-40) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:3ce7940333fbf1244e25 - Deposit or zone: Total Measured + Indicated - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 6255000000 - Grade: 0.48 - Grade Unit: g/t - Contained Metal: 95.5 - Contained Unit: moz #### Prior Estimate - Resource Date: 2026-03-30 - Prior Contained Metal: 88.7 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Significant increase in contained gold for the Measured and Indicated categories, driven by updated economic parameters. - Positive factor: contained\_metal\_growth Evidence · table > 0.48 Context: 6,255,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Contained Metal Growth** Polarity: positive Definition: True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes. Why it applies: 95.5 against 88.7 previously **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-41) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:3ce7940333fbf1244e25 - Deposit or zone: Total Measured + Indicated - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 6255000000 - Grade: 0.15 - Grade Unit: % - Contained Metal: 21146 - Contained Unit: mlb #### Prior Estimate - Resource Date: 2026-03-30 - Prior Contained Metal: 19646 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Significant increase in contained copper for the Measured and Indicated categories, driven by updated economic parameters. - Positive factor: contained\_metal\_growth Evidence · table > 0.15 Context: 6,255,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Contained Metal Growth** Polarity: positive Definition: True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes. Why it applies: 21146 against 19646 previously **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-42) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:3ce7940333fbf1244e25 - Deposit or zone: Total Measured + Indicated - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 6255000000 - Grade: 2.3 - Grade Unit: g/t - Contained Metal: 459.9 - Contained Unit: moz #### Prior Estimate - Resource Date: 2026-03-30 - Prior Contained Metal: 417.2 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Significant increase in contained silver for the Measured and Indicated categories, driven by updated economic parameters. - Positive factor: contained\_metal\_growth Evidence · table > 2.3 Context: 6,255,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Contained Metal Growth** Polarity: positive Definition: True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes. Why it applies: 459.9 against 417.2 previously **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-43) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:3ce7940333fbf1244e25 - Deposit or zone: Total Measured + Indicated - Mining method: open\_pit #### Resource Data - Category: indicated - Tonnes: 6255000000 - Grade: 61 - Grade Unit: ppm - Contained Metal: 837 - Contained Unit: mlb #### Prior Estimate - Resource Date: 2026-03-30 - Prior Contained Metal: 744 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Significant increase in contained molybdenum for the Measured and Indicated categories, driven by updated economic parameters. - Positive factor: contained\_metal\_growth Evidence · table > 61 Context: 6,255,000 #### Tags used in scoring **Indicated Resource** Polarity: positive Definition: Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves. Why it applies: category is "indicated" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Contained Metal Growth** Polarity: positive Definition: True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes. Why it applies: 837 against 744 previously **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-44) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:baf2e1948c3bff489b32 - Deposit or zone: Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 1980000000 - Grade: 0.26 - Grade Unit: g/t - Contained Metal: 16.6 - Contained Unit: moz - Cutoff Grade: 11.85 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade gold in a very large Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 0.26 Context: 1,980,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-45) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:baf2e1948c3bff489b32 - Deposit or zone: Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 1980000000 - Grade: 0.12 - Grade Unit: % - Contained Metal: 5238 - Contained Unit: mlb - Cutoff Grade: 11.85 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade copper in a very large Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 0.12 Context: 1,980,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-46) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:baf2e1948c3bff489b32 - Deposit or zone: Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 1980000000 - Grade: 2.36 - Grade Unit: g/t - Contained Metal: 150.2 - Contained Unit: moz - Cutoff Grade: 11.85 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a very large Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 2.36 Context: 1,980,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-47) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:baf2e1948c3bff489b32 - Deposit or zone: Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 1980000000 - Grade: 45.8 - Grade Unit: ppm - Contained Metal: 200 - Contained Unit: mlb - Cutoff Grade: 11.85 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade molybdenum in a very large Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 45.8 Context: 1,980,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-48) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:0b146ecde4c03d5978e0 - Deposit or zone: East Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 589000000 - Grade: 0.3 - Grade Unit: g/t - Contained Metal: 5.7 - Contained Unit: moz - Cutoff Grade: 12.35 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade gold in a large Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 0.30 Context: 589,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-49) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:0b146ecde4c03d5978e0 - Deposit or zone: East Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 589000000 - Grade: 0.06 - Grade Unit: % - Contained Metal: 779 - Contained Unit: mlb - Cutoff Grade: 12.35 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade copper in a large Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 0.06 Context: 589,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-50) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:0b146ecde4c03d5978e0 - Deposit or zone: East Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 589000000 - Grade: 1.83 - Grade Unit: g/t - Contained Metal: 34.7 - Contained Unit: moz - Cutoff Grade: 12.35 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a large Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 1.83 Context: 589,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-51) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:0b146ecde4c03d5978e0 - Deposit or zone: East Mitchell - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 589000000 - Grade: 58.1 - Grade Unit: ppm - Contained Metal: 75 - Contained Unit: mlb - Cutoff Grade: 12.35 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Strong-grade molybdenum in a large Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 58.1 Context: 589,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-52) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:aa84f18263acbaa7f575 - Deposit or zone: Sulphurets - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 326000000 - Grade: 0.39 - Grade Unit: g/t - Contained Metal: 4.1 - Contained Unit: moz - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade gold in a large Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 0.39 Context: 326,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-53) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:aa84f18263acbaa7f575 - Deposit or zone: Sulphurets - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 326000000 - Grade: 0.11 - Grade Unit: % - Contained Metal: 791 - Contained Unit: mlb - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade copper in a large Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 0.11 Context: 326,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-54) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:aa84f18263acbaa7f575 - Deposit or zone: Sulphurets - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 326000000 - Grade: 1.35 - Grade Unit: g/t - Contained Metal: 14.1 - Contained Unit: moz - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a large Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 1.35 Context: 326,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-55) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:aa84f18263acbaa7f575 - Deposit or zone: Sulphurets - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 326000000 - Grade: 26 - Grade Unit: ppm - Contained Metal: 19 - Contained Unit: mlb - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade molybdenum in a large Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 26.0 Context: 326,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-56) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:2b4c6bd4bbce3d706d3c - Deposit or zone: Kerr - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 106000000 - Grade: 0.24 - Grade Unit: g/t - Contained Metal: 0.8 - Contained Unit: moz - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade gold in a moderate Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 0.24 Context: 106,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-57) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:2b4c6bd4bbce3d706d3c - Deposit or zone: Kerr - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 106000000 - Grade: 0.18 - Grade Unit: % - Contained Metal: 421 - Contained Unit: mlb - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade copper in a moderate Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 0.18 Context: 106,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-58) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:2b4c6bd4bbce3d706d3c - Deposit or zone: Kerr - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 106000000 - Grade: 1.07 - Grade Unit: g/t - Contained Metal: 3.6 - Contained Unit: moz - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a moderate Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 1.07 Context: 106,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-59) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:2b4c6bd4bbce3d706d3c - Deposit or zone: Kerr - OP - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 106000000 - Grade: 4.9 - Grade Unit: ppm - Contained Metal: 1 - Contained Unit: mlb - Cutoff Grade: 9.9 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade molybdenum in a moderate Inferred open-pit resource. - Negative factor: inferred\_resource Evidence · table > 4.9 Context: 106,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-60) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:f1a63d9ffdd72f1fe6ee - Deposit or zone: Kerr - UG - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 2699000000 - Grade: 0.27 - Grade Unit: g/t - Contained Metal: 23.4 - Contained Unit: moz - Cutoff Grade: 20 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade gold in a very large Inferred underground resource. - Negative factor: inferred\_resource Evidence · table > 0.27 Context: 2,699,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-61) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:f1a63d9ffdd72f1fe6ee - Deposit or zone: Kerr - UG - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 2699000000 - Grade: 0.34 - Grade Unit: % - Contained Metal: 20231 - Contained Unit: mlb - Cutoff Grade: 20 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade copper in a very large Inferred underground resource. - Negative factor: inferred\_resource Evidence · table > 0.34 Context: 2,699,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-62) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:f1a63d9ffdd72f1fe6ee - Deposit or zone: Kerr - UG - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 2699000000 - Grade: 1.7 - Grade Unit: g/t - Contained Metal: 147.5 - Contained Unit: moz - Cutoff Grade: 20 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a very large Inferred underground resource. - Negative factor: inferred\_resource Evidence · table > 1.7 Context: 2,699,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-63) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:f1a63d9ffdd72f1fe6ee - Deposit or zone: Kerr - UG - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 2699000000 - Grade: 21.1 - Grade Unit: ppm - Contained Metal: 126 - Contained Unit: mlb - Cutoff Grade: 20 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade molybdenum in a very large Inferred underground resource. - Negative factor: inferred\_resource Evidence · table > 21.1 Context: 2,699,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-64) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:2e125c98f30405d06daf - Deposit or zone: Iron Cap - UG - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 2769000000 - Grade: 0.38 - Grade Unit: g/t - Contained Metal: 33.8 - Contained Unit: moz - Cutoff Grade: 18.5 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade gold in a very large Inferred underground resource. - Negative factor: inferred\_resource Evidence · table > 0.38 Context: 2,769,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-65) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:2e125c98f30405d06daf - Deposit or zone: Iron Cap - UG - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 2769000000 - Grade: 0.25 - Grade Unit: % - Contained Metal: 15262 - Contained Unit: mlb - Cutoff Grade: 18.5 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade copper in a very large Inferred underground resource. - Negative factor: inferred\_resource Evidence · table > 0.25 Context: 2,769,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-66) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:2e125c98f30405d06daf - Deposit or zone: Iron Cap - UG - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 2769000000 - Grade: 2.47 - Grade Unit: g/t - Contained Metal: 219.9 - Contained Unit: moz - Cutoff Grade: 18.5 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Weak-grade silver in a very large Inferred underground resource. - Negative factor: inferred\_resource Evidence · table > 2.47 Context: 2,769,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-67) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:2e125c98f30405d06daf - Deposit or zone: Iron Cap - UG - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 2769000000 - Grade: 30.3 - Grade Unit: ppm - Contained Metal: 185 - Contained Unit: mlb - Cutoff Grade: 18.5 - Cutoff Unit: $/t NSR #### Prior Estimate - Resource Date: 2026-03-30 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Moderate-grade molybdenum in a very large Inferred underground resource. - Negative factor: inferred\_resource Evidence · table > 30.3 Context: 2,769,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: cutoff\_grade is stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-68) KSM Project · gold #### Identity - Project: KSM Project - Commodity: gold - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:804a865ab2cb42b278f3 - Deposit or zone: Total Inferred - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 8469000000 - Grade: 0.31 - Grade Unit: g/t - Contained Metal: 84.4 - Contained Unit: moz #### Prior Estimate - Resource Date: 2026-03-30 - Prior Contained Metal: 71.5 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Significant increase in contained gold for the Inferred category, driven by updated economic parameters. - Positive factor: contained\_metal\_growth - Negative factor: inferred\_resource Evidence · table > 0.31 Context: 8,469,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Contained Metal Growth** Polarity: positive Definition: True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes. Why it applies: 84.4 against 71.5 previously **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-69) KSM Project · copper #### Identity - Project: KSM Project - Commodity: copper - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:804a865ab2cb42b278f3 - Deposit or zone: Total Inferred - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 8469000000 - Grade: 0.23 - Grade Unit: % - Contained Metal: 42722 - Contained Unit: mlb #### Prior Estimate - Resource Date: 2026-03-30 - Prior Contained Metal: 38522 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Significant increase in contained copper for the Inferred category, driven by updated economic parameters. - Positive factor: contained\_metal\_growth - Negative factor: inferred\_resource Evidence · table > 0.23 Context: 8,469,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Contained Metal Growth** Polarity: positive Definition: True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes. Why it applies: 42722 against 38522 previously **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-70) KSM Project · silver #### Identity - Project: KSM Project - Commodity: silver - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:804a865ab2cb42b278f3 - Deposit or zone: Total Inferred - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 8469000000 - Grade: 2.1 - Grade Unit: g/t - Contained Metal: 570 - Contained Unit: moz #### Prior Estimate - Resource Date: 2026-03-30 - Prior Contained Metal: 461.2 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Significant increase in contained silver for the Inferred category, driven by updated economic parameters. - Positive factor: contained\_metal\_growth - Negative factor: inferred\_resource Evidence · table > 2.1 Context: 8,469,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Contained Metal Growth** Polarity: positive Definition: True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes. Why it applies: 570 against 461.2 previously **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/seabridge-gold-provides-updated-mineral-resource-estimates-for-ksm-project--72d4c342-8b9a-4bfe-8522-b19235a9d870#fact-resource-facts-71) KSM Project · molybdenum #### Identity - Project: KSM Project - Commodity: molybdenum - Region: canada\_bc - Reported Region: Northwest British Columbia - Ticker: SEA #### Resource scope - Estimate type: resource - Effective date: 2022-08-08T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Henry Kim P.Geo. - Resource group id: resource:804a865ab2cb42b278f3 - Deposit or zone: Total Inferred - Mining method: open\_pit #### Resource Data - Category: inferred - Tonnes: 8469000000 - Grade: 32.5 - Grade Unit: ppm - Contained Metal: 606 - Contained Unit: mlb #### Prior Estimate - Resource Date: 2026-03-30 - Prior Contained Metal: 466 #### Metal Equivalent - Assumptions Disclosed: Yes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-31T00:00:00.000Z Reasoning: Significant increase in contained molybdenum for the Inferred category, driven by updated economic parameters. - Positive factor: contained\_metal\_growth - Negative factor: inferred\_resource Evidence · table > 32.5 Context: 8,469,000 #### Tags used in scoring **Inferred Resource** Polarity: negative Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone. Why it applies: category is "inferred" **Cut-off Undisclosed** Polarity: negative Definition: High-grade interval reported without stating the cut-off grade used for compositing. Why it applies: no cutoff\_grade was stated **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: qp\_signed is true **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: reporting\_standards includes ni\_43\_101 **Contained Metal Growth** Polarity: positive Definition: True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes. Why it applies: 606 against 466 previously **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: the release compares against a previous estimate **PEA-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study. Why it applies: the release names the study this estimate supports **DFS-Supporting** Polarity: neutral Definition: Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence. Why it applies: the release names the study this estimate supports ## How Atlas produces this analysis Minestarters Atlas uses automated extraction to summarize mining announcements, identify reported measurements, and classify supporting evidence. Sentiment reflects the extracted narrative and classification rules; it is an interpretation, not a reported measurement. Evidence quotes and context are provided where available. Missing data, low-confidence results, and review flags indicate limitations. Check the original publisher announcement before relying on an interpretation.