Altamira Gold Expands Mineralized Porphyry System at Maria Bonita Gold Deposit, 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
- Drill results, Other
- Extracted
- 2026-09-13 10:36:22 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Altamira Gold reported successful step-out drilling at the Maria Bonita deposit, with holes MBA038 and MBA039 intersecting wide zones of gold mineralization outside the current resource boundary. The results suggest the porphyry-hosted mineralized system extends into the surrounding volcanic tuffs. Conversely, scout drilling at the Mombaque prospect returned only narrow, low-grade intercepts.
Reasoning: Drilling at Maria Bonita successfully extended the known mineralized footprint to the north-west and into the wall rock, though the Mombaque target was not scalable.
Positive factors
- extension of mineralized system beyond existing resource boundaries
- mineralization identified in wall rock tuffs outside the porphyry
- wide intercepts (117m and 74m) confirm system scale
Negative factors
- Mombaque prospect results were disappointing/low-grade
Facts used in scoring: 4
Classification and evidence
Step-Out Extensionpositive
Mineralization extended beyond the previously known limit.
Why it applies: Intercepts MBA038 and MBA039 are outside the existing Maria Bonita gold resource.
Evidence · text
“Two drill holes completed to the north-west and outside of the Maria Bonita gold resource”
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: Release details laboratory (SGS Geosol), methods (fire assay, ICP), and QA/QC protocols (blanks, standards, duplicates).
Evidence · text
“Quality control of drill hole assays follows normal industry procedures of inserting control samples randomly”
Extracted facts
Stored fact records: 4. Some facts used in scoring do not have a stored record.
Drill Results (4)
MBA039Maria Bonita · goldGrade: 0.4Grade Unit: g/tIntercept: 117 mView all detailsHide details
Identity
- Hole ID
- MBA039
- Project
- Maria Bonita
- Commodity
- gold
- Region
- brazil
- Reported Region
- brazil
- Ticker
- ALTA
Geometry
- Grade
- 0.4
- Grade Unit
- g/t
- Intercept
- 117 m
- From
- 0 m
- To
- 117 m
- Intercept Depth
- 0 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- MBA039:0-117
- Mining Method
- open_pit
Location
- Location
- north-west of Maria Bonita
- Loc. Source
- document
QA/QC
- Laboratory
- SGS Geosol
- QA/QC Disclosed
- Yes
- QP Signed
- Yes
- QA/QC Methods
- standards, blanks, duplicates
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-23T00:00:00.000Z
Reasoning: Wide intercept of 117m at 0.4 g/t Au confirms extension of the system.
Positive factors
- wide intercept (117m)
- extends resource boundary
Evidence · text
“Drill hole MBA039 intersected 117m @ 0.4g/t gold from surface”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
MBA038Maria Bonita · goldGrade: 0.3Grade Unit: g/tIntercept: 74 mView all detailsHide details
Identity
- Hole ID
- MBA038
- Project
- Maria Bonita
- Commodity
- gold
- Region
- brazil
- Reported Region
- brazil
- Ticker
- ALTA
Geometry
- Grade
- 0.3
- Grade Unit
- g/t
- Intercept
- 74 m
- From
- 74 m
- To
- 148 m
- Intercept Depth
- 74 m
Classification
- Deposit Type
- porphyry
- Program
- exploration
- Sample Type
- drill
- Group ID
- MBA038:74-148
- Mining Method
- open_pit
Location
- Location
- north-west of Maria Bonita
- Loc. Source
- document
QA/QC
- Laboratory
- SGS Geosol
- QA/QC Disclosed
- Yes
- QP Signed
- Yes
- QA/QC Methods
- standards, blanks, duplicates
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-23T00:00:00.000Z
Reasoning: Significant because mineralization is preserved in the wall rock tuffs, increasing tonnage potential.
Positive factors
- mineralization in wall rock tuffs
- extends system beyond porphyry limits
Evidence · text
“Drill hole MBA038 returned 74m @ 0.3g/t gold from 74m downhole”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
MBQ001MombaqueView all detailsHide details
Identity
- Hole ID
- MBQ001
- Project
- Mombaque
- Region
- brazil
- Reported Region
- brazil
- Ticker
- ALTA
Classification
- Program
- exploration
- Sample Type
- drill
QA/QC
- QA/QC Disclosed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-23T00:00:00.000Z
Reasoning: Scout drilling at Mombaque returned only narrow zones of low-grade gold.
Negative factors
- low-grade results
- reduces likelihood of scalable system
Evidence · text
“Drill results (Figures 6 & 7 and Table 2) show only narrow zones of low-grade gold in tuffs and intrusives.”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
MBQ002MombaqueView all detailsHide details
Identity
- Hole ID
- MBQ002
- Project
- Mombaque
- Region
- brazil
- Reported Region
- brazil
- Ticker
- ALTA
Classification
- Program
- exploration
- Sample Type
- drill
QA/QC
- QA/QC Disclosed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-07-23T00:00:00.000Z
Reasoning: The magnetic felsic intrusive intersected in MBQ002 does not contain significant gold.
Negative factors
- no significant gold
Evidence · text
“The magnetic felsic intrusive intersected in the lower part of hole MBQ002 ... does not contain significant gold”
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
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.