# Grande Portage Resources Reports Positive Results from Preliminary Strength Testing of Mine Backfill Materials Canonical Atlas analysis: https://atlas-extractions.minestarters.com/news/grande-portage-resources-reports-positive-results-from-preliminary-strength-test--7c88aad8-1a03-43cc-98cb-d13948e95427 Original source: https://money.tmx.com/en/quote/GPG/news/6446637191569929/grande-portage-resources-reports-positive-results-from-preliminary-strength-test Publisher: tmx Original announcement: 2026-07-06T08:00:00.000Z Analysis by Minestarters Atlas Atlas analysis published: Unknown date Atlas analysis updated: Unknown date - Company: Grande Portage Resources Ltd. - Ticker: GPG - Exchange: TSX - Region: Alaska - Primary commodity: Gold - Secondary commodities: Silver - Document categories: Resource update, Metallurgy - Extracted: 2026-09-16 02:36:04 UTC Narrative sentiment: 0.60 · Bullish ## Minestarters Atlas summary Grande Portage Resources has reported successful preliminary strength testing of cemented rockfill \(CRF\) for its New Amalga Gold Project, meeting criteria for planned overhand longhole stoping. The results support a small-footprint underground mining strategy that utilizes waste rock as backfill to minimize surface environmental impact. The company also restated its Indicated and Inferred gold and silver resources. Reasoning: The announcement provides positive metallurgical de-risking via backfill strength testing and restates a robust gold-silver resource. - Positive factor: Successful preliminary backfill strength testing - Positive factor: Supports small-footprint underground mining strategy - Positive factor: Reduces environmental permitting risk and reclamation obligations - Positive factor: Strong existing resource base - Negative factor: Testing is preliminary and limited to 4% cement binder Facts used in scoring: 5 ## Classification and evidence **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: Kyle Mehalek, P.E., is named as the QP who reviewed and approved the technical disclosure. Evidence · text > Kyle Mehalek, P.E.., is the QP within the meaning of NI 43-101 and has reviewed and approved the technical disclosure in this release. **NI 43-101 Compliant** Polarity: positive Definition: Resource estimate prepared in compliance with NI 43-101 \(Canada\) — high reporting standard. Why it applies: The resource estimate and technical disclosures are prepared in compliance with NI 43-101. Evidence · text > The Company's updated NI43-101 Mineral Resource Estimate \(MRE\) **Single Domain Only** Polarity: negative Definition: Testing limited to one composite or domain — representativeness not established. Why it applies: only one composite was tested ## Extracted facts Stored fact records: 5. Some facts used in scoring do not have a stored record. ## Resource Estimates (4) ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/grande-portage-resources-reports-positive-results-from-preliminary-strength-test--7c88aad8-1a03-43cc-98cb-d13948e95427#fact-resource-facts-0) New Amalga Gold Project · gold #### Identity - Project: New Amalga Gold Project - Commodity: gold - Region: usa\_ak - Reported Region: Alaska - Ticker: GPG #### Resource scope - Estimate type: resource - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Dr. David R. Webb - Resource group id: resource:b33960b6778273c8c227 - Deposit or zone: New Amalga - Mining method: underground - Resource basis: attributable #### Resource Data - Category: indicated - Tonnes: 4726000 - Grade: 9.47 - Grade Unit: g/t - Contained Metal: 1438500 - Contained Unit: oz - Cutoff Grade: 2.5 - Cutoff Unit: g/t Au #### Prior Estimate - Resource Date: 2024-07-17 #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-07-06T00:00:00.000Z Reasoning: Indicated gold resource with high grade and significant contained metal. - Positive factor: High grade - Positive factor: Large scale Evidence · text > Indicated Resource of 1,438,500 ounces of gold at an average grade of 9.47 g/t Au \(4,726,000 tonnes\) #### 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 **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/grande-portage-resources-reports-positive-results-from-preliminary-strength-test--7c88aad8-1a03-43cc-98cb-d13948e95427#fact-resource-facts-1) New Amalga Gold Project · gold #### Identity - Project: New Amalga Gold Project - Commodity: gold - Region: usa\_ak - Reported Region: Alaska - Ticker: GPG #### Resource scope - Estimate type: resource - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Dr. David R. Webb - Resource group id: resource:540e872842e2a7b3a3e9 - Deposit or zone: New Amalga - Mining method: underground - Resource basis: attributable #### Resource Data - Category: inferred - Tonnes: 1813000 - Grade: 8.85 - Grade Unit: g/t - Contained Metal: 515700 - Contained Unit: oz - Cutoff Grade: 2.5 - Cutoff Unit: g/t Au #### Prior Estimate - Resource Date: 2024-07-17 #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-07-06T00:00:00.000Z Reasoning: Inferred gold resource supporting project scale. - Positive factor: Solid grade for inferred category - Negative factor: Inferred category limits confidence Evidence · text > Inferred Resource of 515,700 ounces of gold at an average grade of 8.85 g/t Au \(1,813,000 tonnes\) #### 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 **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/grande-portage-resources-reports-positive-results-from-preliminary-strength-test--7c88aad8-1a03-43cc-98cb-d13948e95427#fact-resource-facts-2) New Amalga Gold Project · silver #### Identity - Project: New Amalga Gold Project - Commodity: silver - Region: usa\_ak - Reported Region: Alaska - Ticker: GPG #### Resource scope - Estimate type: resource - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Dr. David R. Webb - Resource group id: resource:b33960b6778273c8c227 - Deposit or zone: New Amalga - Mining method: underground - Resource basis: attributable #### Resource Data - Category: indicated - Tonnes: 4726000 - Grade: 5.86 - Grade Unit: g/t - Contained Metal: 891600 - Contained Unit: oz - Cutoff Grade: 2.5 - Cutoff Unit: g/t Au #### Prior Estimate - Resource Date: 2024-07-17 #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-07-06T00:00:00.000Z Reasoning: Indicated silver resource providing byproduct value. - Positive factor: Significant silver byproduct Evidence · text > Indicated Resource of 891,600 ounces of silver at an average grade of 5.86 g/t Ag \(4,726,000 tonnes\) #### 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 **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/grande-portage-resources-reports-positive-results-from-preliminary-strength-test--7c88aad8-1a03-43cc-98cb-d13948e95427#fact-resource-facts-3) New Amalga Gold Project · silver #### Identity - Project: New Amalga Gold Project - Commodity: silver - Region: usa\_ak - Reported Region: Alaska - Ticker: GPG #### Resource scope - Estimate type: resource - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Dr. David R. Webb - Resource group id: resource:540e872842e2a7b3a3e9 - Deposit or zone: New Amalga - Mining method: underground - Resource basis: attributable #### Resource Data - Category: inferred - Tonnes: 1813000 - Grade: 7.33 - Grade Unit: g/t - Contained Metal: 390600 - Contained Unit: oz - Cutoff Grade: 2.5 - Cutoff Unit: g/t Au #### Prior Estimate - Resource Date: 2024-07-17 #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-07-06T00:00:00.000Z Reasoning: Inferred silver resource. - Positive factor: Significant silver byproduct - Negative factor: Inferred category limits confidence Evidence · text > Inferred Resource of 390,600 ounces of silver at an average grade of 7.33 g/t silver \(1,813,000 tonnes\) #### 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 **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 ## Metallurgical Results (1) ### backfill strength testing [Link to this fact](https://atlas-extractions.minestarters.com/news/grande-portage-resources-reports-positive-results-from-preliminary-strength-test--7c88aad8-1a03-43cc-98cb-d13948e95427#fact-metallurgical-facts-4) New Amalga Gold Project · gold #### Identity - Project: New Amalga Gold Project - Commodity: gold - Region: usa\_ak - Reported Region: Alaska - Ticker: GPG #### Test Work - Program Status: preliminary - Test Type: backfill strength testing - Processing Route: cemented rockfill \(CRF\) - Sample: CRF samples using 4% cement binder #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-07-06T00:00:00.000Z Reasoning: Successful preliminary testing of backfill material for planned mining method. - Positive factor: Met or exceeded strength criteria - Positive factor: Supports planned mining method Evidence · text > All samples met or exceeded the preliminary strength criteria selected for overhand longhole stoping ## 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.