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, Production
- Extracted
- 2026-08-23 15:15:02 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 substantial growth in open pit reserves and resources, effectively replacing depletion and extending mine life.
Positive factors
- Significant increase in open pit reserves (24%)
- Significant increase in open pit M&I resources (65%)
- Successful replacement of mining depletion
- Extension of open pit mine life
Negative factors
- Underground estimates pending engineering studies
Facts used in scoring: 9
Classification and evidence
Tonnage Growthpositive
Significant tonnage increase (≥15%) vs prior estimate with grade maintained or improved.
Why it applies: Open pit reserves increased by 24% and M&I resources by 65% since the 2020 MRMR.
Evidence · text
“open pit Mineral Reserves and open pit Measured and Indicated Resources increased by 24% and 65%, respectively”
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
“The estimates were prepared in accordance with National Instrument 43-101”
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: Multiple Qualified Persons (QP) and Competent Persons (CP) are named and have supervised the estimates.
Evidence · text
“Nicholas Winer, Fellow AusIMM, and Carlos Pires, Chartered Professional, Fellow AusIMM (CP), supervised the preparation”
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: Cut-off grades for reserves and resource wireframes are explicitly stated in the notes.
Evidence · text
“cut-off grades that vary from 0.40 g/t Au to 0.45 g/t Au for oxide ore”
Extracted facts
Stored fact records: 9. Some facts used in scoring do not have a stored record.
Resource Estimates (9)
provengoldTonnes: 2495000Grade: 1.4Grade Unit: g/tContained Metal: 112000Contained Unit: ozView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- GPR
Resource Data
- Category
- proven
- Tonnes
- 2495000
- Grade
- 1.4
- Grade Unit
- g/t
- Contained Metal
- 112000
- Contained Unit
- oz
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
provengoldTonnes: 189000Grade: 3.78Grade Unit: g/tContained Metal: 23000Contained Unit: ozView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- GPR
Resource Data
- Category
- proven
- Tonnes
- 189000
- Grade
- 3.78
- Grade Unit
- g/t
- Contained Metal
- 23000
- Contained Unit
- oz
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2022-04-26T00:00:00.000Z
Reasoning: Proven reserve component of the underground.
Evidence · table
“3.78”
Context: 189
probablegoldTonnes: 7437000Grade: 1.08Grade Unit: g/tContained Metal: 259000Contained Unit: ozView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- GPR
Resource Data
- Category
- probable
- Tonnes
- 7437000
- Grade
- 1.08
- Grade Unit
- g/t
- Contained Metal
- 259000
- Contained Unit
- oz
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
probablegoldTonnes: 1976000Grade: 4.17Grade Unit: g/tContained Metal: 265000Contained Unit: ozView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- GPR
Resource Data
- Category
- probable
- Tonnes
- 1976000
- Grade
- 4.17
- Grade Unit
- g/t
- Contained Metal
- 265000
- Contained Unit
- oz
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2022-04-26T00:00:00.000Z
Reasoning: Probable reserve component of the underground.
Evidence · table
“4.17”
Context: 1,976
measuredgoldTonnes: 5651000Grade: 1.2Grade Unit: g/tContained Metal: 217000Contained Unit: ozView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- GPR
Resource Data
- Category
- measured
- Tonnes
- 5651000
- Grade
- 1.2
- Grade Unit
- g/t
- Contained Metal
- 217000
- Contained Unit
- oz
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
indicatedgoldTonnes: 18863000Grade: 1.17Grade Unit: g/tContained Metal: 711000Contained Unit: ozView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- GPR
Resource Data
- Category
- indicated
- Tonnes
- 18863000
- Grade
- 1.17
- Grade Unit
- g/t
- Contained Metal
- 711000
- Contained Unit
- oz
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
indicatedgoldTonnes: 2493000Grade: 4.41Grade Unit: g/tContained Metal: 353000Contained Unit: ozView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- GPR
Resource Data
- Category
- indicated
- Tonnes
- 2493000
- Grade
- 4.41
- Grade Unit
- g/t
- Contained Metal
- 353000
- Contained Unit
- oz
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2022-04-26T00:00:00.000Z
Reasoning: Indicated resource component of the underground.
Evidence · table
“4.41”
Context: 2,493
inferredgoldTonnes: 1476000Grade: 1.1Grade Unit: g/tContained Metal: 52000Contained Unit: ozView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- GPR
Resource Data
- Category
- inferred
- Tonnes
- 1476000
- Grade
- 1.1
- Grade Unit
- g/t
- Contained Metal
- 52000
- Contained Unit
- oz
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2022-04-26T00:00:00.000Z
Reasoning: Inferred resource component of the open pit.
Evidence · table
“1.10”
Context: 1,476
inferredgoldTonnes: 5306000Grade: 2.73Grade Unit: g/tContained Metal: 466000Contained Unit: ozView all detailsHide details
Identity
- Commodity
- gold
- Ticker
- GPR
Resource Data
- Category
- inferred
- Tonnes
- 5306000
- Grade
- 2.73
- Grade Unit
- g/t
- Contained Metal
- 466000
- Contained Unit
- oz
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2022-04-26T00:00:00.000Z
Reasoning: Inferred resource component of the underground.
Evidence · table
“2.73”
Context: 5,306
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.