Altamira Gold Announces Maiden Mineral Resource Estimate for Maria Bonita Porphyry Gold Project, Cajueiro District, Brazil
Original announcement by tmx on
- 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
Analysis by Minestarters Atlas
Minestarters Atlas analysis
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 factors
- Maiden resource establishment
- Significant tonnage (approx 50Mt total)
- District-scale potential with 8 additional targets
- High-grade near-surface sensitivity
Negative factors
- High proportion of Inferred resource (approx 50%)
- Porphyry gold grades are relatively low (0.44-0.46 g/t)
Facts used in scoring: 6
Classification and evidence
Maiden Resourceneutral
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 Signedpositive
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 Disclosedpositive
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 Resourcenegative
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)
indicatedgoldTonnes: 24190000Grade: 0.46Grade Unit: g/tContained Metal: 357800Contained Unit: ozHistorical resultNeeds review: historical_restatementView all detailsHide details
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 factors
- Maiden resource
Evidence · text
“total Indicated Resources of 24.19Mt @ 0.46g/t gold (for a total of 357,800oz)”
inferredgoldTonnes: 25640000Grade: 0.44Grade Unit: g/tContained Metal: 362400Contained Unit: ozHistorical resultNeeds review: historical_restatementView all detailsHide details
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 factors
- Significant tonnage
Negative factors
- Speculative category
Evidence · text
“Total Inferred Resources of 25.64Mt @ 0.44g/t gold (for a total of 362,400oz)”
indicatedgoldTonnes: 2020000Grade: 0.59Grade Unit: g/tContained Metal: 38000Contained Unit: ozView all detailsHide details
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 factors
- Higher grade saprolite
Evidence · text
“near-surface saprolite Indicated Resources of 2,02Mt @ 0.59g/t gold (for a total of 38,000oz)”
inferredgoldTonnes: 680000Grade: 0.4Grade Unit: g/tContained Metal: 8700Contained Unit: ozView all detailsHide details
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)”
indicatedgoldTonnes: 7560000Grade: 0.72Grade Unit: g/tContained Metal: 176250Contained Unit: ozView all detailsHide details
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 factors
- 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)”
inferredgoldTonnes: 5180000Grade: 0.92Grade Unit: g/tContained Metal: 152940Contained Unit: ozView all detailsHide details
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 factors
- 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.