Great Panther Announces Updated Mineral Reserve and Mineral Resource Estimates for the Tucano Gold Mine
Original announcement by tmx on
- Company
- Great Panther Mining Limited
- Ticker
- GPR
- Exchange
- TSX
- Region
- Brazil
- Primary commodity
- Gold
- Secondary commodities
- None reported
- Document categories
- Resource update, Other
- Extracted
- 2026-09-16 03:29:32 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Great Panther has released updated 2021 Mineral Reserve and Mineral Resource Estimates for the Tucano Gold Mine in Brazil. The update highlights a 24% increase in open pit reserves and a 65% increase in open pit Measured and Indicated resources compared to the 2020 estimate.
Reasoning: The update shows significant growth in both open pit reserves and M&I resources, effectively extending mine life and replacing depletion.
Positive factors
- Significant tonnage growth in open pit reserves (+24%)
- Substantial M&I resource expansion (+65%)
- Successful replacement of mining depletion
- Increased mine life for open pit
Negative factors
- Underground estimates pending engineering studies
Facts used in scoring: 5
Classification and evidence
Tonnage Growthpositive
Tonnage increase reaching the strong tier vs prior estimate, with grade maintained or improved.
Why it applies: Open pit reserves increased by 24% since the 2020 MRMR.
Evidence · text
“a 24% increase in P&P open pit reserves since the previously reported MRMR estimate”
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: Estimates were prepared in accordance with NI 43-101 standards.
Evidence · text
“prepared in accordance with National Instrument 43-101”
QA/QC Disclosedpositive · Story-specific tag
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: Release details QA/QC protocols including blanks, standards, duplicates, and certified laboratory use.
Evidence · text
“includes the regular insertion of blanks, standards and duplicates”
Extracted facts
Stored fact records: 5. Some facts used in scoring do not have a stored record.
Resource Estimates (5)
provenTucano Gold Mine · goldTonnes: 2495000Grade: 1.4Grade Unit: g/tContained Metal: 112000Contained Unit: ozView all detailsHide details
Identity
- Project
- Tucano Gold Mine
- Commodity
- gold
- Region
- brazil
- Reported Region
- Brazil
- Ticker
- GPR
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Fernando A. Cornejo, Nicholas Winer, Carlos Pires
- Resource group id
- resource:5ec471fb40da2ba3cda5
- Deposit or zone
- Open pit
- Mining method
- combined
- Material type
- oxide
Resource Data
- Category
- proven
- Tonnes
- 2495000
- Grade
- 1.4
- Grade Unit
- g/t
- Contained Metal
- 112000
- Contained Unit
- oz
- Cutoff Grade
- 2.4
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2021-07-31
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2022-04-26T00:00:00.000Z
Reasoning: Proven reserve component of the open pit.
Evidence · table
“1.40”
Context: 2,495
Tags used in scoring
Proven Reservepositive
Measured Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "proven"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
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: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
probableTucano Gold Mine · goldTonnes: 74371000Grade: 1.08Grade Unit: g/tContained Metal: 259000Contained Unit: ozView all detailsHide details
Identity
- Project
- Tucano Gold Mine
- Commodity
- gold
- Region
- brazil
- Reported Region
- Brazil
- Ticker
- GPR
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Fernando A. Cornejo, Nicholas Winer, Carlos Pires
- Resource group id
- resource:6ef8c4b4fffcf328071d
- Deposit or zone
- Open pit
- Mining method
- combined
- Material type
- oxide
Resource Data
- Category
- probable
- Tonnes
- 74371000
- Grade
- 1.08
- Grade Unit
- g/t
- Contained Metal
- 259000
- Contained Unit
- oz
- Cutoff Grade
- 2.4
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2021-07-31
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2022-04-26T00:00:00.000Z
Reasoning: Probable reserve component of the open pit.
Evidence · table
“1.08”
Context: 7,4371
Tags used in scoring
Probable Reservepositive
Indicated Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "probable"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
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: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
measuredTucano Gold Mine · goldTonnes: 5651000Grade: 1.2Grade Unit: g/tContained Metal: 217000Contained Unit: ozView all detailsHide details
Identity
- Project
- Tucano Gold Mine
- Commodity
- gold
- Region
- brazil
- Reported Region
- Brazil
- Ticker
- GPR
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Fernando A. Cornejo, Nicholas Winer, Carlos Pires
- Resource group id
- resource:86250ea51833a37112f6
- Deposit or zone
- Open pit
- Mining method
- combined
- Material type
- oxide
Resource Data
- Category
- measured
- Tonnes
- 5651000
- Grade
- 1.2
- Grade Unit
- g/t
- Contained Metal
- 217000
- Contained Unit
- oz
- Cutoff Grade
- 2.4
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2021-07-31
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2022-04-26T00:00:00.000Z
Reasoning: Measured resource component of the open pit.
Evidence · table
“1.20”
Context: 5,651
Tags used in scoring
Measured Resourcepositive
Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves.
Why it applies: category is "measured"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
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: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
indicatedTucano Gold Mine · goldTonnes: 18863000Grade: 1.17Grade Unit: g/tContained Metal: 711000Contained Unit: ozView all detailsHide details
Identity
- Project
- Tucano Gold Mine
- Commodity
- gold
- Region
- brazil
- Reported Region
- Brazil
- Ticker
- GPR
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Fernando A. Cornejo, Nicholas Winer, Carlos Pires
- Resource group id
- resource:219d2925d0919ccb70a6
- Deposit or zone
- Open pit
- Mining method
- combined
- Material type
- oxide
Resource Data
- Category
- indicated
- Tonnes
- 18863000
- Grade
- 1.17
- Grade Unit
- g/t
- Contained Metal
- 711000
- Contained Unit
- oz
- Cutoff Grade
- 2.4
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2021-07-31
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2022-04-26T00:00:00.000Z
Reasoning: Indicated resource component of the open pit.
Evidence · table
“1.17”
Context: 18,863
Tags used in scoring
Indicated Resourcepositive
Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves.
Why it applies: category is "indicated"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
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: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
inferredTucano Gold Mine · goldTonnes: 1476000Grade: 1.1Grade Unit: g/tContained Metal: 52000Contained Unit: ozView all detailsHide details
Identity
- Project
- Tucano Gold Mine
- Commodity
- gold
- Region
- brazil
- Reported Region
- Brazil
- Ticker
- GPR
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Fernando A. Cornejo, Nicholas Winer, Carlos Pires
- Resource group id
- resource:11ec334eb8e0028d3517
- Deposit or zone
- Open pit
- Mining method
- combined
- Material type
- oxide
Resource Data
- Category
- inferred
- Tonnes
- 1476000
- Grade
- 1.1
- Grade Unit
- g/t
- Contained Metal
- 52000
- Contained Unit
- oz
- Cutoff Grade
- 2.4
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2021-07-31
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2022-04-26T00:00:00.000Z
Reasoning: Inferred resource component of the open pit.
Negative factors
- Inferred category implies limited geological confidence
Evidence · table
“1.10”
Context: 1,476
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
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: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
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.