# Altamira Gold Announces Maiden Mineral Resource Estimate for Maria Bonita Porphyry Gold Project, Cajueiro District, Brazil

Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/altamira-gold-announces-maiden-mineral-resource-estimate-for-maria-bonita-porphy--c85152ed-aafc-4b6f-a965-5bf440f53d5e

Original source: https://money.tmx.com/en/quote/ALTA/news/5268310211793601/altamira-gold-announces-maiden-mineral-resource-estimate-for-maria-bonita-porphy

Publisher: tmx

Original announcement: 2025-05-05T10:30:00.000Z

Analysis by Minestarters Atlas

Atlas analysis published: Unknown date

Atlas analysis updated: Unknown date

- Company: Altamira Gold Corp.

- Ticker: ALTA

- Exchange: TSX

- Region: Mato Grosso, Brazil

- Primary commodity: Gold

- Secondary commodities: None reported

- Document categories: Resource update, Other

- Extracted: 2026-08-21 08:24:38 UTC

Narrative sentiment: 0.80 · Bullish

## Minestarters Atlas summary

Altamira Gold has announced a maiden mineral resource estimate for the Maria Bonita porphyry gold project in Brazil, totaling approximately 50 million tonnes at 0.45 g/t gold. The resource is split nearly equally between Indicated and Inferred categories and highlights significant near-surface high-grade potential.

Reasoning: The announcement of a maiden resource of ~50Mt at ~0.45 g/t Au for a porphyry target is a major de-risking and scale-defining event for the company.

- Positive factor: Maiden resource establishment

- Positive factor: Significant tonnage \(approx 50Mt total\)

- Positive factor: District-scale potential with 8 additional targets

- Positive factor: High-grade near-surface sensitivity

- Negative factor: High proportion of Inferred resource \(approx 50%\)

- Negative factor: Porphyry gold grades are relatively low \(0.44-0.46 g/t\)

Facts used in scoring: 6

## Classification and evidence

**Maiden Resource**

Polarity: neutral

Definition: First formal MRE for the project — establishes baseline but typically exploration-stage with high Inferred component.

Why it applies: First formal MRE for the Maria Bonita project.

Evidence · text

> announce the results of an independently assessed, maiden mineral resource estimate

**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, PhD, MAIG is named as the Qualified Person.

Evidence · text

> Qualified Person Volodymyr Myadzel, PhD, MAIG... supervised the preparation of the technical information

**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 0.2 g/t gold cut-off is clearly stated for the main resource.

Evidence · text

> These resources were calculated using a 0.2 g/t gold cut-off grade.

**Inferred Resource**

Polarity: negative

Definition: Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.

Why it applies: A significant portion of the resource is in the Inferred category.

Evidence · text

> Total Inferred Resources of 25.64Mt @ 0.44g/t gold

## Extracted facts

Stored fact records: 6. Some facts used in scoring do not have a stored record.

## Resource Estimates (6)

### indicated

[Link to this fact](https://atlas-staging.minestarters.com/news/altamira-gold-announces-maiden-mineral-resource-estimate-for-maria-bonita-porphy--c85152ed-aafc-4b6f-a965-5bf440f53d5e#fact-resource-facts-0)

gold

Historical result

Needs review: historical\_restatement

#### Identity

- Commodity: gold
- Ticker: ALTA

#### Resource Data

- Category: indicated
- Tonnes: 24190000
- Grade: 0.46
- Grade Unit: g/t
- Contained Metal: 357800
- Contained Unit: oz

#### Review

- Needs Review: Yes
- Review Reason: historical\_restatement
- Historical: Yes

#### Dates

- Event date: 2025-05-05T00:00:00.000Z

Reasoning: Primary Indicated resource component of the maiden estimate.

- Positive factor: Maiden resource

Evidence · text

> total Indicated Resources of 24.19Mt @ 0.46g/t gold \(for a total of 357,800oz\)

### inferred

[Link to this fact](https://atlas-staging.minestarters.com/news/altamira-gold-announces-maiden-mineral-resource-estimate-for-maria-bonita-porphy--c85152ed-aafc-4b6f-a965-5bf440f53d5e#fact-resource-facts-1)

gold

Historical result

Needs review: historical\_restatement

#### Identity

- Commodity: gold
- Ticker: ALTA

#### Resource Data

- Category: inferred
- Tonnes: 25640000
- Grade: 0.44
- Grade Unit: g/t
- Contained Metal: 362400
- Contained Unit: oz

#### Review

- Needs Review: Yes
- Review Reason: historical\_restatement
- Historical: Yes

#### Dates

- Event date: 2025-05-05T00:00:00.000Z

Reasoning: Large Inferred component adds scale but lower geological confidence.

- Positive factor: Significant tonnage

- Negative factor: Speculative category

Evidence · text

> Total Inferred Resources of 25.64Mt @ 0.44g/t gold \(for a total of 362,400oz\)

### indicated

[Link to this fact](https://atlas-staging.minestarters.com/news/altamira-gold-announces-maiden-mineral-resource-estimate-for-maria-bonita-porphy--c85152ed-aafc-4b6f-a965-5bf440f53d5e#fact-resource-facts-2)

gold

#### Identity

- Commodity: gold
- Ticker: ALTA

#### Resource Data

- Category: indicated
- Tonnes: 2020000
- Grade: 0.59
- Grade Unit: g/t
- Contained Metal: 38000
- Contained Unit: oz

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-05-05T00:00:00.000Z

Reasoning: Near-surface saprolite component of the Indicated resource.

- Positive factor: Higher grade saprolite

Evidence · text

> near-surface saprolite Indicated Resources of 2,02Mt @ 0.59g/t gold \(for a total of 38,000oz\)

### inferred

[Link to this fact](https://atlas-staging.minestarters.com/news/altamira-gold-announces-maiden-mineral-resource-estimate-for-maria-bonita-porphy--c85152ed-aafc-4b6f-a965-5bf440f53d5e#fact-resource-facts-3)

gold

#### Identity

- Commodity: gold
- Ticker: ALTA

#### Resource Data

- Category: inferred
- Tonnes: 680000
- Grade: 0.4
- Grade Unit: g/t
- Contained Metal: 8700
- Contained Unit: oz

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-05-05T00:00:00.000Z

Reasoning: Near-surface saprolite component of the Inferred resource.

Evidence · text

> Inferred Resources of 0.68t @ 0.40g/t gold \(for a total of 8,700oz\)

### indicated

[Link to this fact](https://atlas-staging.minestarters.com/news/altamira-gold-announces-maiden-mineral-resource-estimate-for-maria-bonita-porphy--c85152ed-aafc-4b6f-a965-5bf440f53d5e#fact-resource-facts-4)

gold

#### Identity

- Commodity: gold
- Ticker: ALTA

#### Resource Data

- Category: indicated
- Tonnes: 7560000
- Grade: 0.72
- Grade Unit: g/t
- Contained Metal: 176250
- Contained Unit: oz

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-05-05T00:00:00.000Z

Reasoning: Indicated resource at a higher 0.5 g/t cut-off.

- Positive factor: Higher grade sensitivity

Evidence · text

> at a 0.5 g/t gold cut-off comprises Indicated Resources of 7.56Mt @ 0.72g/t gold \(176,250oz\)

### inferred

[Link to this fact](https://atlas-staging.minestarters.com/news/altamira-gold-announces-maiden-mineral-resource-estimate-for-maria-bonita-porphy--c85152ed-aafc-4b6f-a965-5bf440f53d5e#fact-resource-facts-5)

gold

#### Identity

- Commodity: gold
- Ticker: ALTA

#### Resource Data

- Category: inferred
- Tonnes: 5180000
- Grade: 0.92
- Grade Unit: g/t
- Contained Metal: 152940
- Contained Unit: oz

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-05-05T00:00:00.000Z

Reasoning: Inferred resource at a higher 0.5 g/t cut-off.

- Positive factor: High grade sensitivity

Evidence · text

> and Inferred Resources of 5.18Mt @ 0.92g/t gold \(152,940oz\)

## 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.