PRU increases Nyanzaga Project Ore Reserves to 4.0Moz
Original announcement by tmx on
- Company
- Perseus Mining Limited
- Ticker
- PRU
- Exchange
- TSX
- Region
- Tanzania
- Primary commodity
- Gold
- Secondary commodities
- None reported
- Document categories
- Resource update
- Extracted
- 2026-09-14 18:53:23 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Perseus Mining has updated the Nyanzaga Gold Project ore reserves to 4.0 Moz, representing a 73% increase from the April 2025 estimate. The update is supported by 82,700m of recent drilling and a revised large-scale open-pit mine design, extending the projected mine life to 16 years.
Reasoning: Significant expansion of ore reserves (from 2.3 Moz to 4.0 Moz) driven by successful infill and extension drilling and pit optimization.
Positive factors
- 73% increase in ore reserves compared to April 2025
- Mine life extended to 16 years
- Significant drilling campaign (82,700m) underpinning the update
- Strong investment metrics (28.8% IRR, $864M NPV)
Facts used in scoring: 7
Classification and evidence
Tonnage Growthpositive
Tonnage increase reaching the strong tier vs prior estimate, with grade maintained or improved.
Why it applies: Ore reserves increased by 73% from 2.3 Moz to 4.0 Moz.
Evidence · text
“This represents a 73% increase to the 2.3 Moz Ore Reserve reported in April 2025”
JORC Compliantpositive
Resource estimate prepared in compliance with JORC Code (Australia) — high reporting standard.
Why it applies: The reserve is classified in accordance with the JORC Code (2012).
Evidence · text
“The Ore Reserve is classified as Probable in accordance with the JORC Code (2012)”
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: The release states preparation in accordance with NI 43-101 standards.
Evidence · text
“and have been prepared in accordance with the standards set out in ... NI 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: Competent Persons Daniel Saunders and Adrian Ralph are named and responsible for the report.
Evidence · text
“prepared by Mr Daniel Saunders, a Competent Person”
Extracted facts
Stored fact records: 7. Some facts used in scoring do not have a stored record.
Resource Estimates (7)
probableNyanzaga Gold Project · goldTonnes: 90900000Grade: 1.38Grade Unit: g/tContained Metal: 4046Contained Unit: ’000 ozView all detailsHide details
Identity
- Project
- Nyanzaga Gold Project
- Commodity
- gold
- Region
- tanzania
- Reported Region
- Tanzania
- Ticker
- PRU
Resource scope
- Estimate type
- reserve
- Reporting standards
- jorc, ni_43_101
- QP Signed
- Yes
- Qualified person names
- Daniel Saunders, Adrian Ralph
- Resource group id
- resource:b6431643bca0dbab984e
- Deposit or zone
- Nyanzaga Gold Project
- Mining method
- open_pit
- Ownership percent
- 80 %
- Resource basis
- attributable
Resource Data
- Category
- probable
- Tonnes
- 90900000
- Grade
- 1.38
- Grade Unit
- g/t
- Contained Metal
- 4046
- Contained Unit
- ’000 oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-02-20
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-19T00:00:00.000Z
Reasoning: Large scale probable reserve update.
Positive factors
- Significant tonnage and metal growth
Evidence · text
“The Probable Ore Reserve for the NGP is estimated as 90.9 Mt, grading 1.38 g/t Au and containing 4.0 Moz of gold”
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
JORC Compliantpositive
Resource estimate prepared in compliance with JORC Code (Australia) — high reporting standard.
Why it applies: reporting_standards includes jorc
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
indicatedNyanzaga Gold Project · goldTonnes: 110400000Grade: 1.33Grade Unit: g/tContained Metal: 4715Contained Unit: ’000 ozView all detailsHide details
Identity
- Project
- Nyanzaga Gold Project
- Commodity
- gold
- Region
- tanzania
- Reported Region
- Tanzania
- Ticker
- PRU
Resource scope
- Estimate type
- resource
- Reporting standards
- jorc, ni_43_101
- QP Signed
- Yes
- Qualified person names
- Daniel Saunders, Adrian Ralph
- Resource group id
- resource:91a2afc0a5557d1cf090
- Deposit or zone
- Nyanzaga Gold Project
- Mining method
- open_pit
- Ownership percent
- 80 %
- Resource basis
- attributable
Resource Data
- Category
- indicated
- Tonnes
- 110400000
- Grade
- 1.33
- Grade Unit
- g/t
- Contained Metal
- 4715
- Contained Unit
- ’000 oz
- Cutoff Grade
- 0.25
- Cutoff Unit
- g/t gold
Prior Estimate
- Resource Date
- 2026-02-20
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-19T00:00:00.000Z
Reasoning: Substantial indicated resource supporting the reserve.
Positive factors
- Large M&I resource base
Evidence · text
“The combined M&I Mineral Resource for the NGP is estimated at 110.4 Mt grading 1.33 g/t Au, containing 4.7 Moz of gold.”
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
JORC Compliantpositive
Resource estimate prepared in compliance with JORC Code (Australia) — high reporting standard.
Why it applies: reporting_standards includes jorc
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
inferredNyanzaga Gold Project · goldTonnes: 6500000Grade: 1.6Grade Unit: g/tContained Metal: 343Contained Unit: kozView all detailsHide details
Identity
- Project
- Nyanzaga Gold Project
- Commodity
- gold
- Region
- tanzania
- Reported Region
- Tanzania
- Ticker
- PRU
Resource scope
- Estimate type
- resource
- Reporting standards
- jorc, ni_43_101
- QP Signed
- Yes
- Qualified person names
- Daniel Saunders, Adrian Ralph
- Resource group id
- resource:9d57e73a37705f8ddf3e
- Deposit or zone
- Nyanzaga Gold Project
- Mining method
- open_pit
- Ownership percent
- 80 %
- Resource basis
- attributable
Resource Data
- Category
- inferred
- Tonnes
- 6500000
- Grade
- 1.6
- Grade Unit
- g/t
- Contained Metal
- 343
- Contained Unit
- koz
Prior Estimate
- Resource Date
- 2026-02-20
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-19T00:00:00.000Z
Reasoning: Inferred resource provides additional upside but lacks geological confidence.
Positive factors
- Higher grade than M&I
Negative factors
- Speculative category
Evidence · text
“A further 6.5 Mt of material grading 1.6 g/t Au, containing 343 koz of gold is classified as Inferred Mineral Resources”
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 Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was 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
JORC Compliantpositive
Resource estimate prepared in compliance with JORC Code (Australia) — high reporting standard.
Why it applies: reporting_standards includes jorc
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
indicatedTusker · goldTonnes: 100700000Grade: 1.37Grade Unit: g/tView all detailsHide details
Identity
- Project
- Tusker
- Commodity
- gold
- Ticker
- PRU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, jorc
- Resource group id
- resource:8eec3529a7cee59d17d6
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 100700000
- Grade
- 1.37
- Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-19T00:00:00.000Z
Reasoning: Expanded from portfolio resource summary table.
Negative factors
- Fact expanded from resource table columns (model omitted this commodity).
Evidence · table
“1.37”
Context: 100.7
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 Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
JORC Compliantpositive
Resource estimate prepared in compliance with JORC Code (Australia) — high reporting standard.
Why it applies: reporting_standards includes jorc
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
No Contained Metalnegative
Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting.
Why it applies: contained_metal was not reported
inferredTusker · goldTonnes: 5500000Grade: 1.8Grade Unit: g/tView all detailsHide details
Identity
- Project
- Tusker
- Commodity
- gold
- Ticker
- PRU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, jorc
- Resource group id
- resource:1c9524ae366c86ac98b1
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 5500000
- Grade
- 1.8
- Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-19T00:00:00.000Z
Reasoning: Expanded from portfolio resource summary table.
Negative factors
- Fact expanded from resource table columns (model omitted this commodity).
Evidence · table
“1.8”
Context: 5.5
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 Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
JORC Compliantpositive
Resource estimate prepared in compliance with JORC Code (Australia) — high reporting standard.
Why it applies: reporting_standards includes jorc
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
No Contained Metalnegative
Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting.
Why it applies: contained_metal was not reported
indicatedKilimani · goldTonnes: 9700000Grade: 0.9Grade Unit: g/tView all detailsHide details
Identity
- Project
- Kilimani
- Commodity
- gold
- Ticker
- PRU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, jorc
- Resource group id
- resource:1276edecd117d6706d18
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 9700000
- Grade
- 0.9
- Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-19T00:00:00.000Z
Reasoning: Expanded from portfolio resource summary table.
Negative factors
- Fact expanded from resource table columns (model omitted this commodity).
Evidence · table
“0.90”
Context: 9.7
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 Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
JORC Compliantpositive
Resource estimate prepared in compliance with JORC Code (Australia) — high reporting standard.
Why it applies: reporting_standards includes jorc
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
No Contained Metalnegative
Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting.
Why it applies: contained_metal was not reported
inferredKilimani · goldTonnes: 1000000Grade: 1Grade Unit: g/tView all detailsHide details
Identity
- Project
- Kilimani
- Commodity
- gold
- Ticker
- PRU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, jorc
- Resource group id
- resource:a2ad046584d912ab142c
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 1000000
- Grade
- 1
- Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-02-19T00:00:00.000Z
Reasoning: Expanded from portfolio resource summary table.
Negative factors
- Fact expanded from resource table columns (model omitted this commodity).
Evidence · table
“1.0”
Context: 1.0
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 Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
JORC Compliantpositive
Resource estimate prepared in compliance with JORC Code (Australia) — high reporting standard.
Why it applies: reporting_standards includes jorc
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
No Contained Metalnegative
Tonnage and grade reported but contained metal not calculated or disclosed — incomplete reporting.
Why it applies: contained_metal was not reported
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.