# Altamira Gold Announces Significant Increase in Mineral Resources at the Maria Bonita Porphyry Gold Deposit, Cajueiro District, Brazil Canonical Atlas analysis: https://atlas-extractions.minestarters.com/news/altamira-gold-announces-significant-increase-in-mineral-resources-at-the-maria-b--fe28a10d-3cd9-41d3-b9df-ab740a8827b8 Original source: https://www.newsfilecorp.com/release/315137/Altamira-Gold-Announces-Significant-Increase-in-Mineral-Resources-at-the-Maria-Bonita-Porphyry-Gold-Deposit-Cajueiro-District-Brazil Publisher: newsfile Original announcement: 2026-09-21T12:29:00.000Z Analysis by Minestarters Atlas Atlas analysis published: Unknown date Atlas analysis updated: Unknown date - Company: Altamira Gold Corp. - Ticker: ALTA - Exchange: Unavailable - Region: Brazil - Primary commodity: Gold - Secondary commodities: None reported - Document categories: Resource update - Extracted: 2026-09-21 12:33:18 UTC Narrative sentiment: 0.80 · Bullish ## Minestarters Atlas summary Altamira Gold Corp. has announced an updated Mineral Resource Estimate for the Maria Bonita porphyry gold deposit in Brazil, showing a 90% increase in total tonnage and an 82% increase in contained gold compared to the 2025 maiden estimate. The Indicated resource now stands at 25Mt @ 0.50g/t gold, while Inferred resources have expanded to 70Mt @ 0.41g/t gold. Reasoning: The update shows massive scale expansion for the Maria Bonita deposit, with both tonnage and contained ounces increasing significantly compared to the maiden estimate. - Positive factor: Significant tonnage growth \(90%\) - Positive factor: Substantial contained gold increase \(82%\) - Positive factor: Strong Inferred category growth \(150%\) - Positive factor: Expansion of high-grade sector - Positive factor: Open mineralized system Facts used in scoring: 4 ## Classification and evidence **Tonnage Growth** Polarity: positive Definition: Tonnage increase reaching the strong tier vs prior estimate, with grade maintained or improved. Why it applies: Total resource tonnage increased by 90% compared to the maiden estimate. Evidence · text > total resource tonnage increasing by 90% **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: Contained gold increased by 82% compared to the maiden estimate. Evidence · text > contained gold by 82% **Category Upgrade** Polarity: positive Definition: Resource confidence improved — Inferred upgraded to Indicated, or Indicated to Measured. De-risking signal. Why it applies: The release highlights significant growth in both Indicated and Inferred categories. Evidence · text > represents a 150% increase in the contained ounces in the Inferred category and a 12% increase in contained ounces in the Indicated category **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: Volodymyr Myadzel and Fernando Benegas are named as Qualified Persons. Evidence · text > under the direction of Volodymyr Myadzel, PhD, MAIG, a consultant to the Company and a Qualified Person **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: The MRE is reported at a cut-off grade of 0.24 g/t gold. Evidence · text > reported at a cut-off grade of 0.24 g/t gold **Resource Update** Polarity: neutral Definition: Revised estimate for an existing resource — compare to prior to assess progress. Why it applies: The source explicitly discloses a revised resource estimate Evidence · text > updated Mineral Resource Estimate ## Extracted facts Stored fact records: 4. 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/altamira-gold-announces-significant-increase-in-mineral-resources-at-the-maria-b--fe28a10d-3cd9-41d3-b9df-ab740a8827b8#fact-resource-facts-0) Maria Bonita · gold #### Identity - Project: Maria Bonita - Commodity: gold - Region: brazil - Reported Region: Brazil - Ticker: ALTA #### Resource scope - Estimate type: resource - Effective date: 2026-09-16T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Volodymyr Myadzel, Fernando Benegas - Resource group id: resource:0a30bcf2b2f5a43e720a - Deposit or zone: Maria Bonita - Mining method: open\_pit - Material type: fresh #### Resource Data - Category: indicated - Tonnes: 25000000 - Grade: 0.5 - Grade Unit: g/t - Contained Metal: 403877 - Contained Unit: oz - Cutoff Grade: 0.24 - Cutoff Unit: g/t gold #### Prior Estimate - Resource Date: 2026-09-16 #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-21T00:00:00.000Z Reasoning: Strong Indicated resource for a porphyry deposit. - Positive factor: Significant tonnage and grade maintenance Evidence · text > Indicated Resources of 25Mt @ 0.50g/t gold \(403,877oz contained\) #### 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 ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/altamira-gold-announces-significant-increase-in-mineral-resources-at-the-maria-b--fe28a10d-3cd9-41d3-b9df-ab740a8827b8#fact-resource-facts-1) Maria Bonita · gold #### Identity - Project: Maria Bonita - Commodity: gold - Region: brazil - Reported Region: Brazil - Ticker: ALTA #### Resource scope - Estimate type: resource - Effective date: 2026-09-16T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Volodymyr Myadzel, Fernando Benegas - Resource group id: resource:021aa7b8b77894f24bf4 - Deposit or zone: Maria Bonita - Mining method: open\_pit - Material type: fresh #### Resource Data - Category: inferred - Tonnes: 70000000 - Grade: 0.41 - Grade Unit: g/t - Contained Metal: 908477 - Contained Unit: oz - Cutoff Grade: 0.24 - Cutoff Unit: g/t gold #### Prior Estimate - Resource Date: 2026-09-16 #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-21T00:00:00.000Z Reasoning: Large scale expansion in the Inferred category. - Positive factor: Massive expansion of Inferred scale Evidence · text > Inferred Resources of 70Mt @ 0.41g/t gold \(908,477oz\) #### 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 ### indicated [Link to this fact](https://atlas-extractions.minestarters.com/news/altamira-gold-announces-significant-increase-in-mineral-resources-at-the-maria-b--fe28a10d-3cd9-41d3-b9df-ab740a8827b8#fact-resource-facts-2) Maria Bonita · gold #### Identity - Project: Maria Bonita - Commodity: gold - Region: brazil - Reported Region: Brazil - Ticker: ALTA #### Resource scope - Estimate type: resource - Effective date: 2026-09-16T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Volodymyr Myadzel, Fernando Benegas - Resource group id: resource:9e56f768a445029223fd - Deposit or zone: Maria Bonita - Mining method: open\_pit - Material type: saprolite #### Resource Data - Category: indicated - Tonnes: 1490000 - Grade: 0.65 - Grade Unit: g/t - Contained Metal: 30899 - Contained Unit: oz - Cutoff Grade: 0.24 - Cutoff Unit: g/t gold #### Prior Estimate - Resource Date: 2026-09-16 #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-21T00:00:00.000Z Reasoning: Near-surface saprolite resource provides early access potential. - Positive factor: Higher grade near-surface component Evidence · text > saprolite Indicated resources of 1.49Mt @ 0.65g/t \(30,899oz\) #### 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 ### inferred [Link to this fact](https://atlas-extractions.minestarters.com/news/altamira-gold-announces-significant-increase-in-mineral-resources-at-the-maria-b--fe28a10d-3cd9-41d3-b9df-ab740a8827b8#fact-resource-facts-3) Maria Bonita · gold #### Identity - Project: Maria Bonita - Commodity: gold - Region: brazil - Reported Region: Brazil - Ticker: ALTA #### Resource scope - Estimate type: resource - Effective date: 2026-09-16T00:00:00.000Z - Reporting standards: ni\_43\_101 - QP Signed: Yes - Qualified person names: Volodymyr Myadzel, Fernando Benegas - Resource group id: resource:d730c7558d5cdca4beb9 - Deposit or zone: Maria Bonita - Mining method: open\_pit - Material type: saprolite #### Resource Data - Category: inferred - Tonnes: 1420000 - Grade: 0.38 - Grade Unit: g/t - Contained Metal: 17172 - Contained Unit: oz - Cutoff Grade: 0.24 - Cutoff Unit: g/t gold #### Prior Estimate - Resource Date: 2026-09-16 #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-21T00:00:00.000Z Reasoning: Near-surface saprolite component. Evidence · text > Inferred Resources of 1.42Mt@0.38g/t \(17,172oz\) #### 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 ## 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.