Minera Alamos Announces Positive Pre-Feasibility Study for the Copperstone Gold Project in Arizona
Original announcement by tmx on
- Company
- Minera Alamos Inc.
- Ticker
- MAI
- Exchange
- TSX
- Region
- Arizona
- Primary commodity
- Gold
- Secondary commodities
- None reported
- Document categories
- Resource update
- Extracted
- 2026-08-21 22:39:51 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Minera Alamos announced positive results from a Pre-Feasibility Study for its Copperstone Gold Project in Arizona, revealing robust economics with an after-tax NPV5% of $374 million and an IRR of 108% at a base case gold price of $3,500/oz. The study outlines a 6.3-year mine life producing 291 koz gold at an AISC of $1,314/oz, supported by a 110% increase in Measured & Indicated Resources to 630 koz gold and maiden Proven & Probable Reserves of 303 koz gold. The company's board has approved fast-track construction, with initial gold production anticipated by mid-2027.
Reasoning: The Pre-Feasibility Study for the Copperstone Gold Project demonstrates robust economics and a clear path to production, supported by a high-confidence resource with 91% Measured & Indicated categories and maiden Proven & Probable Reserves. The project benefits from exceptional gold recovery and is fully permitted, leading to a board-approved construction decision, despite the contained gold ounces being relatively small.
Positive factors
- Strong project economics
- Maiden Proven & Probable Reserves
- Exceptional M&I confidence (91%)
- Exceptional gold recovery (96%)
- Fully permitted for construction
- Board approved construction decision
- Significant increase in M&I resources (110% contained gold growth)
Negative factors
- Relatively small contained gold ounces (all categories below 500 koz threshold)
Low confidence — this extraction should be reviewed alongside the original source.
Facts used in scoring: 8
Classification and evidence
Resource Updateneutral
Revised estimate for an existing resource — compare to prior to assess progress.
Why it applies: The document reports 'Increased Measured & Indicated Resources to 4,054 kt grading 4.83 grams per tonne gold ("g/t") and containing 630 koz gold, representing a 110% increase in contained gold ounces compared to the previous mineral resource estimate.'
Evidence · text
“Increased Measured & Indicated ("M&I") Resources to 4,054 kt grading 4.83 grams per tonne gold ("g/t") and containing 630 koz gold, representing a 110% increase in contained gold ounces compared to the previous mineral resource estimate.”
Contained Metal Growthpositive
True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes.
Why it applies: The document states a '110% increase in contained gold ounces compared to the previous mineral resource estimate.'
Evidence · text
“110% increase in contained gold ounces compared to the previous mineral resource estimate.”
Maiden Reservepositive · Story-specific tag
No canonical definition is currently available.
Why it applies: The document announces 'Maiden Proven & Probable Reserves are 1,934 kt grading 4.87 g/t and containing 303 koz gold.'
Evidence · text
“Maiden Proven & Probable Reserves are 1,934 kt grading 4.87 g/t and containing 303 koz gold.”
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: Scott Zelligan, P. Geo. and Peter Szkilnyk, P.Eng. are named as Qualified Persons responsible for the MRE and Reserve estimates, respectively.
Evidence · text
“Scott Zelligan, P. Geo. is responsible for reviewing and approving the Copperstone mine underground Mineral Resource Estimate. Mr. Zelligan is a Qualified Person ("QP") as set out in NI 43-101”
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: The PFS and associated technical report are explicitly stated to be prepared in accordance with National Instrument 43-101.
Evidence · text
“A technical report for the Copperstone PFS is being prepared in accordance with National Instrument 43-101 ("NI 43-101")”
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: The mineral resource and reserve estimates are reported with a clear cut-off grade of '0.064 oz/ton gold (2.2 g/t Au)'.
Evidence · text
“The MRE is reported at an underground mining cut-off of 0.064 oz/ton gold (2.2 g/t Au).”
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: The document is an announcement of the results of a Pre-Feasibility Study (PFS).
Evidence · text
“results of a pre-feasibility study (the "PFS")”
High Recoverypositive · Story-specific tag
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: The projected overall gold recovery of 96% is above the exceptional band (95%) for a mill processing route.
Evidence · text
“projected overall gold recovery of approximately 96%.”
Mill Routeneutral · Story-specific tag
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: The process plant design incorporates 'crushing, grinding, flotation, and cyanide leaching circuits'.
Evidence · text
“The proposed flowsheet will incorporate crushing, grinding, flotation, and cyanide leaching circuits”
Underground Miningneutral · Story-specific tag
No canonical definition is currently available.
Why it applies: The project is described as an 'underground gold mining project' and 'underground accessible Resources were considered'.
Evidence · text
“underground gold mining project”
Extracted facts
Stored fact records: 8. Some facts used in scoring do not have a stored record.
Resource Estimates (8)
measuredCopperstone · goldTonnes: 2198000Grade: 5.08Grade Unit: g/tContained Metal: 359000Contained Unit: ozView all detailsHide details
Identity
- Project
- Copperstone
- Commodity
- gold
- Region
- usa_az
- Reported Region
- Arizona
- Ticker
- MAI
Resource Data
- Category
- measured
- Tonnes
- 2198000
- Grade
- 5.08
- Grade Unit
- g/t
- Contained Metal
- 359000
- Contained Unit
- oz
- Cutoff Grade
- 2.2
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-05-27T00:00:00.000Z
Reasoning: The Measured resource shows a strong gold grade for an underground project, contributing to the overall positive PFS economics, but the total contained gold ounces are relatively small.
Positive factors
- High grade for underground mining
- Part of a high-confidence resource estimate
- NI 43-101 compliant
- QP signed
Negative factors
- Contained gold ounces are below the weak threshold for contained metal scale
Evidence · table
“5.08”
Context: 2,198
indicatedCopperstone · goldTonnes: 1856000Grade: 4.54Grade Unit: g/tContained Metal: 271000Contained Unit: ozView all detailsHide details
Identity
- Project
- Copperstone
- Commodity
- gold
- Region
- usa_az
- Reported Region
- Arizona
- Ticker
- MAI
Resource Data
- Category
- indicated
- Tonnes
- 1856000
- Grade
- 4.54
- Grade Unit
- g/t
- Contained Metal
- 271000
- Contained Unit
- oz
- Cutoff Grade
- 2.2
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-05-27T00:00:00.000Z
Reasoning: The Indicated resource shows a strong gold grade for an underground project, contributing to the overall positive PFS economics, but the total contained gold ounces are relatively small.
Positive factors
- High grade for underground mining
- Part of a high-confidence resource estimate
- NI 43-101 compliant
- QP signed
Negative factors
- Contained gold ounces are below the weak threshold for contained metal scale
Evidence · table
“4.54”
Context: 1,856
indicatedCopperstone · goldTonnes: 4054000Grade: 4.83Grade Unit: g/tContained Metal: 630000Contained Unit: ozView all detailsHide details
Identity
- Project
- Copperstone
- Commodity
- gold
- Region
- usa_az
- Reported Region
- Arizona
- Ticker
- MAI
Resource Data
- Category
- indicated
- Tonnes
- 4054000
- Grade
- 4.83
- Grade Unit
- g/t
- Contained Metal
- 630000
- Contained Unit
- oz
- Cutoff Grade
- 2.2
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-05-27T00:00:00.000Z
Reasoning: The total Measured & Indicated resource shows a strong gold grade for an underground project and represents exceptional confidence, but the total contained gold ounces are relatively small.
Positive factors
- High grade for underground mining
- Part of a high-confidence resource estimate
- NI 43-101 compliant
- QP signed
- Exceptional M&I confidence (91%)
Negative factors
- Contained gold ounces are below the weak threshold for contained metal scale
Evidence · table
“4.83”
Context: 4,054
inferredCopperstone · goldTonnes: 401000Grade: 4.04Grade Unit: g/tContained Metal: 52000Contained Unit: ozView all detailsHide details
Identity
- Project
- Copperstone
- Commodity
- gold
- Region
- usa_az
- Reported Region
- Arizona
- Ticker
- MAI
Resource Data
- Category
- inferred
- Tonnes
- 401000
- Grade
- 4.04
- Grade Unit
- g/t
- Contained Metal
- 52000
- Contained Unit
- oz
- Cutoff Grade
- 2.2
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-05-27T00:00:00.000Z
Reasoning: The Inferred resource shows a strong gold grade for an underground project, but its contained gold ounces are very small and it represents a lower confidence category.
Positive factors
- High grade for underground mining
- NI 43-101 compliant
- QP signed
Negative factors
- Contained gold ounces are below the weak threshold for contained metal scale
- Inferred category has lower geological confidence
Evidence · table
“4.04”
Context: 401
provenCopperstone · goldTonnes: 1052000Grade: 5.06Grade Unit: g/tContained Metal: 172000Contained Unit: ozView all detailsHide details
Identity
- Project
- Copperstone
- Commodity
- gold
- Region
- usa_az
- Reported Region
- Arizona
- Ticker
- MAI
Resource Data
- Category
- proven
- Tonnes
- 1052000
- Grade
- 5.06
- Grade Unit
- g/t
- Contained Metal
- 172000
- Contained Unit
- oz
- Cutoff Grade
- 2.2
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-05-27T00:00:00.000Z
Reasoning: The Proven reserve shows a strong gold grade for an underground project and is part of the maiden reserve estimate, but the total contained gold ounces are relatively small.
Positive factors
- High grade for underground mining
- Maiden reserve estimate
- NI 43-101 compliant
- QP signed
Negative factors
- Contained gold ounces are below the weak threshold for contained metal scale
Evidence · table
“5.06”
Context: 1,052
probableCopperstone · goldTonnes: 882000Grade: 4.61Grade Unit: g/tContained Metal: 131000Contained Unit: ozView all detailsHide details
Identity
- Project
- Copperstone
- Commodity
- gold
- Region
- usa_az
- Reported Region
- Arizona
- Ticker
- MAI
Resource Data
- Category
- probable
- Tonnes
- 882000
- Grade
- 4.61
- Grade Unit
- g/t
- Contained Metal
- 131000
- Contained Unit
- oz
- Cutoff Grade
- 2.2
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-05-27T00:00:00.000Z
Reasoning: The Probable reserve shows a strong gold grade for an underground project and is part of the maiden reserve estimate, but the total contained gold ounces are relatively small.
Positive factors
- High grade for underground mining
- Maiden reserve estimate
- NI 43-101 compliant
- QP signed
Negative factors
- Contained gold ounces are below the weak threshold for contained metal scale
Evidence · table
“4.61”
Context: 882
probableCopperstone · goldTonnes: 1934000Grade: 4.87Grade Unit: g/tContained Metal: 303000Contained Unit: ozView all detailsHide details
Identity
- Project
- Copperstone
- Commodity
- gold
- Region
- usa_az
- Reported Region
- Arizona
- Ticker
- MAI
Resource Data
- Category
- probable
- Tonnes
- 1934000
- Grade
- 4.87
- Grade Unit
- g/t
- Contained Metal
- 303000
- Contained Unit
- oz
- Cutoff Grade
- 2.2
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-05-27T00:00:00.000Z
Reasoning: The maiden Proven & Probable reserve estimate shows a strong gold grade for an underground project, representing a significant de-risking step, but the total contained gold ounces are relatively small.
Positive factors
- High grade for underground mining
- Maiden Proven & Probable Reserves
- NI 43-101 compliant
- QP signed
Negative factors
- Contained gold ounces are below the weak threshold for contained metal scale
Evidence · table
“4.87”
Context: 1,934
Fact 8Copperstone · goldView all detailsHide details
Identity
- Project
- Copperstone
- Commodity
- gold
- Region
- usa_az
- Reported Region
- Arizona
- Ticker
- MAI
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-05-27T00:00:00.000Z
Reasoning: The projected 96% gold recovery for the mill processing route is exceptional and significantly de-risks the project's metallurgical performance.
Positive factors
- Exceptional gold recovery for a mill processing route
Evidence · text
“projected overall gold recovery of approximately 96%.”
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.