# Altamira Gold Announces Significant Increase in Mineral Resources at the Maria Bonita Porphyry Gold Deposit, Cajueiro District, Brazil Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/altamira-gold-announces-significant-increase-in-mineral-resources-at-the-maria-b--acdb5a97-6c87-434a-aaf2-ac467c5d84dd 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: 2026-09-21T13:19:08.705Z Atlas analysis updated: 2026-09-21T13:19:08.705Z - 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 13:19:09 UTC Narrative sentiment: 1.00 · Bullish ## Minestarters Atlas summary Altamira Gold has announced a significant update to the Maria Bonita porphyry gold resource in Brazil, reporting a 90% increase in total tonnage compared to the 2025 maiden estimate. The updated resource includes 25Mt of Indicated and 70Mt of Inferred resources at a 0.24 g/t gold cut-off, driven by successful step-out drilling. Reasoning: The update shows massive scale expansion in both tonnage and contained gold, significantly de-risking the project's potential as a bulk-tonnage porphyry asset. - Positive factor: Tonnage growth of 90% vs maiden estimate - Positive factor: Contained gold growth of 82% vs maiden estimate - Positive factor: Significant expansion in Inferred category \(150% increase\) - Positive factor: High-grade sector growth at 0.5 g/t cut-off - Positive factor: QA/QC disclosed with SGS Geosol and standard methods - Positive factor: QP/CP sign-off by Volodymyr Myadzel and Fernando Benegas - Negative factor: Apparent width only \(true widths not yet determined\) Facts used in scoring: 4 ## Classification and evidence **Tonnage Growth** Polarity: positive Definition: Significant tonnage increase \(≥15%\) vs prior estimate with grade maintained or improved. Why it applies: Total resource tonnage increased by 90% compared to the 2025 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% **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 was prepared in accordance with NI 43-101 standards. Evidence · text > updated Mineral Resource Estimate \("MRE"\) for the Maria Bonita porphyry gold deposit **QA/QC Disclosed** Polarity: positive Story-specific tag Definition: Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods \(blanks, standards, duplicates\). Why it applies: The release details laboratory \(SGS Geosol\), methods \(fire assay, ICP\), and QC protocols \(blanks, standards, duplicates\). Evidence · text > half core is submitted to SGS Geosol... inserting control samples randomly... field duplicates, independent reference samples and "blank" samples. **Apparent Width Only** Polarity: negative Story-specific tag Definition: Interval given as downhole width with no true width or drill orientation — apparent width may overstate true thickness. Why it applies: The document explicitly states that true widths have not yet been determined. Evidence · text > True widths have not yet been determined. ## 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-staging.minestarters.com/news/altamira-gold-announces-significant-increase-in-mineral-resources-at-the-maria-b--acdb5a97-6c87-434a-aaf2-ac467c5d84dd#fact-resource-facts-0) Cajueiro Project · gold #### Identity - Project: Cajueiro Project - 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:604caeb51faeff21bf6a - Deposit or zone: Maria Bonita - Mining method: open\_pit - Material type: fresh - Resource basis: gross #### 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 #### Lab - Laboratory: SGS Geosol #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-21T00:00:00.000Z Reasoning: Strong Indicated resource component 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-staging.minestarters.com/news/altamira-gold-announces-significant-increase-in-mineral-resources-at-the-maria-b--acdb5a97-6c87-434a-aaf2-ac467c5d84dd#fact-resource-facts-1) Cajueiro Project · gold #### Identity - Project: Cajueiro Project - 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:0149a29c905cf4b05d87 - Deposit or zone: Maria Bonita - Mining method: open\_pit - Material type: fresh - Resource basis: gross #### 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 #### Lab - Laboratory: SGS Geosol #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-21T00:00:00.000Z Reasoning: Large scale expansion of the resource footprint. - Positive factor: 150% increase in contained ounces vs maiden 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-staging.minestarters.com/news/altamira-gold-announces-significant-increase-in-mineral-resources-at-the-maria-b--acdb5a97-6c87-434a-aaf2-ac467c5d84dd#fact-resource-facts-2) Cajueiro Project · gold #### Identity - Project: Cajueiro Project - 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:07e667da8e42d6dee610 - Deposit or zone: Maria Bonita - Mining method: open\_pit - Material type: saprolite - Resource basis: gross #### 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 #### Lab - Laboratory: SGS Geosol #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-21T00:00:00.000Z Reasoning: Provides high-grade near-surface component. - Positive factor: Near-surface saprolite resource identified 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-staging.minestarters.com/news/altamira-gold-announces-significant-increase-in-mineral-resources-at-the-maria-b--acdb5a97-6c87-434a-aaf2-ac467c5d84dd#fact-resource-facts-3) Cajueiro Project · gold #### Identity - Project: Cajueiro Project - 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:9f889243e25b53c06ad1 - Deposit or zone: Maria Bonita - Mining method: open\_pit - Material type: saprolite - Resource basis: gross #### 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 #### Lab - Laboratory: SGS Geosol #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-21T00:00:00.000Z Reasoning: Near-surface 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.