Gunnison Copper Project PEA Technical Report Reporting Post-Tax NPV8 of ~US$2.0 Billion and IRR of 22.5% is Now Filed
Original announcement by tmx on
- Company
- Gunnison Copper Corp.
- Ticker
- GCU
- Exchange
- TSX
- Region
- Cochise Mining District, Arizona, United States
- Primary commodity
- Copper
- Secondary commodities
- Zinc, Silver
- Document categories
- Resource update, Metallurgy
- Extracted
- 2026-09-12 03:51:45 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Gunnison Copper Corp. has filed a National Instrument 43-101 compliant Preliminary Economic Assessment (PEA) for its 100%-owned Gunnison Copper Project in Arizona. The PEA outlines robust economics, including an after-tax NPV8 of approximately US$2.0 billion and an internal rate of return of 22.5% at a base case copper price of $4.60/lb. The project is expected to produce 3.2 billion lbs of copper over a 21-year mine life using open-pit mining and heap leach SXEW processing, supported by a significant Measured and Indicated mineral resource estimate.
Reasoning: The document reports a Preliminary Economic Assessment (PEA) for the Gunnison Copper Project, outlining robust economics with a post-tax NPV8 of ~US$2.0 billion and IRR of 22.5%. The PEA is supported by a significant Measured and Indicated mineral resource and high recoveries for oxide/enriched material. However, the PEA is preliminary and includes inferred resources, and primary sulfide recovery is weak for the chosen processing route.
Positive factors
- Robust PEA economics with high NPV and IRR at base case copper price
- Significant Measured and Indicated resource base for the main project
- High copper recovery for oxide/enriched material via heap leach SXEW
- NI 43-101 compliant technical report with multiple Qualified Persons
- Long mine life of 21 years with substantial copper production
Negative factors
- PEA is preliminary in nature and includes inferred mineral resources
- Primary sulfide copper recovery is at the lower end of expectations for heap leach
- Resource cut-off grades vary by material type within the combined resource, adding complexity
Low confidence — this extraction should be reviewed alongside the original source.
Facts used in scoring: 11
Classification and evidence
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: The technical report is explicitly stated as a National Instrument 43-101 technical report.
Evidence · text
“National Instrument 43-101 technical report”
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: The Technical Report was prepared under the supervision of John Woodson, PE, SME-RM, and received contributions from several other Qualified Persons.
Evidence · text
“The Technical Report was prepared under the supervision of John Woodson, PE, SME-RM, of M3 Engineering & Technology Corporation, Tucson, Arizona, who is a Qualified Person that is independent of the Company. The Technical Report also received contributions from the following additional Qualified Persons, who are also independent of the Company”
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: The mineral resources are reported with specific cut-off grades for different material types (0.05% total copper for oxide and transition, 0.1% for sulfide) and 0.07% Cu for Strong & Harris.
Evidence · text
“Mineral Resources are reported within an optimized pit at a 0.05% total copper cut-off for oxide and transition material, and 0.1% cut-off for sulfide.”
Resource Updateneutral
Revised estimate for an existing resource — compare to prior to assess progress.
Why it applies: The document refers to an 'updated Preliminary Economic Assessment' and 'updated Mineral Resource estimate'.
Evidence · text
“updated Preliminary Economic Assessment”
Measured Resourcepositive
Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves.
Why it applies: The resource estimate includes a Measured category of 191.5 million short tons at 0.37% Total Cu.
Evidence · table
“Measured”
Context: 191.5
Indicated Resourcepositive
Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves.
Why it applies: The resource estimate includes an Indicated category of 654.5 million short tons at 0.31% Total Cu.
Evidence · table
“Indicated”
Context: 654.5
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: The resource estimate includes an Inferred category of 94.0 million short tons at 0.21% Total Cu for the main project and 76.070 million short tons for Strong & Harris.
Evidence · table
“Inferred”
Context: 94.0
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: The project utilizes heap leach SXEW processing to produce copper cathode.
Evidence · text
“heap leach SXEW processing”
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: Oxide / Enriched Recoveries are reported at 90.2% CuTSol, which is exceptional for copper heap leach.
Evidence · table
“90.2%”
Context: Oxide / Enriched Recoveries
Low Recoverynegative
Recovery below the weak band for the commodity and processing route.
Why it applies: Primary Sulfide Recoveries are reported at 59.9% CuSu, which is weak for copper heap leach.
Evidence · table
“59.9%”
Context: Primary Sulfide Recoveries (years 10 to 21)
Multi-Domain Testedpositive
Variability across ore domains (oxide, transition, fresh) has been addressed.
Why it applies: 3 distinct composites were tested
Extracted facts
Stored fact records: 11. Some facts used in scoring do not have a stored record.
Resource Estimates (8)
measuredGunnison Copper Project · copperTonnes: 173700000Grade: 0.37Grade Unit: %Contained Metal: 1423Contained Unit: millions lbsView all detailsHide details
Identity
- Project
- Gunnison Copper Project
- Commodity
- copper
- Region
- usa_az
- Reported Region
- Cochise Mining District, Arizona, United States
- Ticker
- GCU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- John Woodson, Jeffrey Bickel, Jacob Richey, Tom Ryan, Dr. Terence P. McNulty, Dr. Abyl Sydykov, R. Douglas Bartlett, Tyler Peck
- Resource group id
- resource:d3fc86c4dc61006d898c
- Deposit or zone
- Combined Oxide, Transitional, and Sulfide Resources
Resource Data
- Category
- measured
- Tonnes
- 173700000
- Grade
- 0.37
- Grade Unit
- %
- Contained Metal
- 1423
- Contained Unit
- millions lbs
- Cutoff Grade
- 0.05
- Cutoff Unit
- % Cu
Prior Estimate
- Resource Date
- 2026-01-23
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-03-31T00:00:00.000Z
Reasoning: The Measured resource for the Gunnison Copper Project represents a high-confidence estimate with substantial tonnage and contained copper, contributing positively to the project's overall viability. The estimate is NI 43-101 compliant and QP signed.
Positive factors
- High confidence Measured resource category
- Significant tonnage and contained copper
- NI 43-101 compliant and QP signed
Negative factors
- Cut-off grade varies by material type (0.05% for oxide/transition, 0.1% for sulfide) within the combined resource
Evidence · table
“191.5”
Context: Measured
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
indicatedGunnison Copper Project · copperTonnes: 593800000Grade: 0.31Grade Unit: %Contained Metal: 3768Contained Unit: millions lbsView all detailsHide details
Identity
- Project
- Gunnison Copper Project
- Commodity
- copper
- Region
- usa_az
- Reported Region
- Cochise Mining District, Arizona, United States
- Ticker
- GCU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- John Woodson, Jeffrey Bickel, Jacob Richey, Tom Ryan, Dr. Terence P. McNulty, Dr. Abyl Sydykov, R. Douglas Bartlett, Tyler Peck
- Resource group id
- resource:ee184eda78ba226b5cd4
- Deposit or zone
- Combined Oxide, Transitional, and Sulfide Resources
Resource Data
- Category
- indicated
- Tonnes
- 593800000
- Grade
- 0.31
- Grade Unit
- %
- Contained Metal
- 3768
- Contained Unit
- millions lbs
- Cutoff Grade
- 0.05
- Cutoff Unit
- % Cu
Prior Estimate
- Resource Date
- 2026-01-23
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-03-31T00:00:00.000Z
Reasoning: The Indicated resource for the Gunnison Copper Project adds substantial tonnage and contained copper, supporting the project's scale and geological confidence. The estimate adheres to NI 43-101 standards and is QP signed.
Positive factors
- Large Indicated resource base, providing geological confidence
- Significant contained copper contributing to project scale
- NI 43-101 compliant and QP signed
Negative factors
- Cut-off grade varies by material type (0.05% for oxide/transition, 0.1% for sulfide) within the combined resource
Evidence · table
“654.5”
Context: Indicated
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
indicatedGunnison Copper Project · copperTonnes: 767600000Grade: 0.33Grade Unit: %Contained Metal: 5190Contained Unit: millions lbsView all detailsHide details
Identity
- Project
- Gunnison Copper Project
- Commodity
- copper
- Region
- usa_az
- Reported Region
- Cochise Mining District, Arizona, United States
- Ticker
- GCU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- John Woodson, Jeffrey Bickel, Jacob Richey, Tom Ryan, Dr. Terence P. McNulty, Dr. Abyl Sydykov, R. Douglas Bartlett, Tyler Peck
- Resource group id
- resource:89081fbc94b45221d5d7
- Deposit or zone
- Combined Oxide, Transitional, and Sulfide Resources
Resource Data
- Category
- indicated
- Tonnes
- 767600000
- Grade
- 0.33
- Grade Unit
- %
- Contained Metal
- 5190
- Contained Unit
- millions lbs
- Cutoff Grade
- 0.05
- Cutoff Unit
- % Cu
Prior Estimate
- Resource Date
- 2026-01-23
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-03-31T00:00:00.000Z
Reasoning: The combined Measured and Indicated resource for the Gunnison Copper Project is very large, providing a strong foundation for the PEA's robust economics. The estimate is NI 43-101 compliant and QP signed.
Positive factors
- Very large Measured and Indicated resource base, providing high geological confidence
- Substantial contained copper, underpinning the project's scale and economics
- NI 43-101 compliant and QP signed
Negative factors
- Cut-off grade varies by material type (0.05% for oxide/transition, 0.1% for sulfide) within the combined resource
Evidence · table
“846.1”
Context: Measured + Indicated
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
inferredGunnison Copper Project · copperTonnes: 85270000Grade: 0.21Grade Unit: %Contained Metal: 397Contained Unit: millions lbsView all detailsHide details
Identity
- Project
- Gunnison Copper Project
- Commodity
- copper
- Region
- usa_az
- Reported Region
- Cochise Mining District, Arizona, United States
- Ticker
- GCU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- John Woodson, Jeffrey Bickel, Jacob Richey, Tom Ryan, Dr. Terence P. McNulty, Dr. Abyl Sydykov, R. Douglas Bartlett, Tyler Peck
- Resource group id
- resource:10260f4876f221d019ae
- Deposit or zone
- Combined Oxide, Transitional, and Sulfide Resources
Resource Data
- Category
- inferred
- Tonnes
- 85270000
- Grade
- 0.21
- Grade Unit
- %
- Contained Metal
- 397
- Contained Unit
- millions lbs
- Cutoff Grade
- 0.05
- Cutoff Unit
- % Cu
Prior Estimate
- Resource Date
- 2026-01-23
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-03-31T00:00:00.000Z
Reasoning: The Inferred resource provides additional tonnage and contained copper but is speculative and requires further drilling to upgrade confidence. Its inclusion in the PEA is noted with caution.
Positive factors
- Adds to the overall resource base and potential for future conversion
- NI 43-101 compliant and QP signed
Negative factors
- Inferred category is speculative and cannot support economic studies alone
- Cut-off grade varies by material type (0.05% for oxide/transition, 0.1% for sulfide) within the combined resource
Evidence · table
“94.0”
Context: Inferred
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
inferredStrong & Harris · copperTonnes: 68990000Grade: 0.49Grade Unit: %Contained Metal: 740Contained Unit: millions lbsView all detailsHide details
Identity
- Project
- Strong & Harris
- Commodity
- copper
- Region
- usa_az
- Reported Region
- Cochise Mining District, Arizona, United States
- Ticker
- GCU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- John Woodson, Jeffrey Bickel, Jacob Richey, Tom Ryan, Dr. Terence P. McNulty, Dr. Abyl Sydykov, R. Douglas Bartlett, Tyler Peck
- Resource group id
- resource:1cad875a1f568bc7178a
- Deposit or zone
- Strong & Harris Mineral Resources
Resource Data
- Category
- inferred
- Tonnes
- 68990000
- Grade
- 0.49
- Grade Unit
- %
- Contained Metal
- 740
- Contained Unit
- millions lbs
- Cutoff Grade
- 0.07
- Cutoff Unit
- % Cu
Prior Estimate
- Resource Date
- 2026-01-23
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-03-31T00:00:00.000Z
Reasoning: The Inferred resource for Strong & Harris provides additional copper potential, with a higher grade than the main Gunnison Inferred resource, but remains speculative due to its category.
Positive factors
- Adds to the overall resource base and potential for future satellite deposits
- Higher copper grade than the main Gunnison Inferred resource
- NI 43-101 compliant and QP signed
Negative factors
- Inferred category is speculative and cannot support economic studies alone
Evidence · table
“76.070”
Context: Inferred
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
inferredStrong & Harris · copperTonnes: 68990000Grade: 0.32Grade Unit: %Contained Metal: 482.691Contained Unit: millions lbsView all detailsHide details
Identity
- Project
- Strong & Harris
- Commodity
- copper
- Region
- usa_az
- Reported Region
- Cochise Mining District, Arizona, United States
- Ticker
- GCU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- John Woodson, Jeffrey Bickel, Jacob Richey, Tom Ryan, Dr. Terence P. McNulty, Dr. Abyl Sydykov, R. Douglas Bartlett, Tyler Peck
- Resource group id
- resource:1cad875a1f568bc7178a
- Deposit or zone
- Strong & Harris Mineral Resources
Resource Data
- Category
- inferred
- Tonnes
- 68990000
- Grade
- 0.32
- Grade Unit
- %
- Contained Metal
- 482.691
- Contained Unit
- millions lbs
- Cutoff Grade
- 0.07
- Cutoff Unit
- % Cu
Prior Estimate
- Resource Date
- 2026-01-23
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-03-31T00:00:00.000Z
Reasoning: The Inferred copper oxide resource at Strong & Harris highlights a potentially leachable component, but its speculative category limits its current economic impact.
Positive factors
- Identifies copper oxide component within the Strong & Harris resource, potentially amenable to heap leach
- NI 43-101 compliant and QP signed
Negative factors
- Inferred category is speculative and cannot support economic studies alone
Evidence · table
“0.32”
Context: 76.070
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
inferredStrong & Harris · zincTonnes: 68990000Grade: 0.56Grade Unit: %Contained Metal: 855.707Contained Unit: millions lbsView all detailsHide details
Identity
- Project
- Strong & Harris
- Commodity
- zinc
- Region
- usa_az
- Reported Region
- Cochise Mining District, Arizona, United States
- Ticker
- GCU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- John Woodson, Jeffrey Bickel, Jacob Richey, Tom Ryan, Dr. Terence P. McNulty, Dr. Abyl Sydykov, R. Douglas Bartlett, Tyler Peck
- Resource group id
- resource:1cad875a1f568bc7178a
- Deposit or zone
- Strong & Harris Mineral Resources
Resource Data
- Category
- inferred
- Tonnes
- 68990000
- Grade
- 0.56
- Grade Unit
- %
- Contained Metal
- 855.707
- Contained Unit
- millions lbs
- Cutoff Grade
- 0.07
- Cutoff Unit
- % Cu
Prior Estimate
- Resource Date
- 2026-01-23
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-03-31T00:00:00.000Z
Reasoning: The Inferred zinc resource at Strong & Harris indicates polymetallic potential, but its speculative category and secondary nature to copper limit its immediate impact.
Positive factors
- Identifies a zinc component within the Strong & Harris resource, adding polymetallic potential
- NI 43-101 compliant and QP signed
Negative factors
- Inferred category is speculative and cannot support economic studies alone
- Zinc is a secondary commodity in a copper-focused project
Evidence · table
“0.56”
Context: 76.070
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
inferredStrong & Harris · silverTonnes: 68990000Contained Metal: 8.971Contained Unit: millions ozView all detailsHide details
Identity
- Project
- Strong & Harris
- Commodity
- silver
- Region
- usa_az
- Reported Region
- Cochise Mining District, Arizona, United States
- Ticker
- GCU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- John Woodson, Jeffrey Bickel, Jacob Richey, Tom Ryan, Dr. Terence P. McNulty, Dr. Abyl Sydykov, R. Douglas Bartlett, Tyler Peck
- Resource group id
- resource:1cad875a1f568bc7178a
- Deposit or zone
- Strong & Harris Mineral Resources
Resource Data
- Category
- inferred
- Tonnes
- 68990000
- Contained Metal
- 8.971
- Contained Unit
- millions oz
- Cutoff Grade
- 0.07
- Cutoff Unit
- % Cu
Prior Estimate
- Resource Date
- 2026-01-23
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-03-31T00:00:00.000Z
Reasoning: The Inferred silver resource at Strong & Harris indicates polymetallic potential, but its speculative category and secondary nature to copper limit its immediate impact.
Positive factors
- Identifies a silver component within the Strong & Harris resource, adding polymetallic potential
- NI 43-101 compliant and QP signed
Negative factors
- Inferred category is speculative and cannot support economic studies alone
- Silver is a secondary commodity in a copper-focused project
Evidence · table
“0.12”
Context: 76.070
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
Metallurgical Results (3)
heap leachGunnison Copper Project · copperRecovery: 68 %Head Grade: 0.43Head Grade Unit: % CuTView all detailsHide details
Identity
- Project
- Gunnison Copper Project
- Commodity
- copper
- Region
- usa_az
- Reported Region
- Cochise Mining District, Arizona, United States
- Ticker
- GCU
Test Work
- Program Status
- preliminary
- Test Type
- heap leach
- Processing Route
- heap leach SXEW
- Sample
- mineralized material placed on Heap
Recovery
- Recovery
- 68 %
- Recovery Basis
- actual_test
- Head Grade
- 0.43
- Head Grade Unit
- % CuT
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-03-31T00:00:00.000Z
Reasoning: The overall copper recovery of 68% for the heap leach SXEW process is strong, contributing positively to the project's economics.
Positive factors
- Strong overall copper recovery for a heap leach operation
- Supports the economic viability outlined in the PEA
Evidence · table
“68%”
Context: Recoveries
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
heap leachGunnison Copper Project · copperRecovery: 90.2 %View all detailsHide details
Identity
- Project
- Gunnison Copper Project
- Commodity
- copper
- Region
- usa_az
- Reported Region
- Cochise Mining District, Arizona, United States
- Ticker
- GCU
Test Work
- Program Status
- preliminary
- Test Type
- heap leach
- Processing Route
- heap leach SXEW
- Sample
- Oxide / Enriched
Recovery
- Recovery
- 90.2 %
- Recovery Basis
- actual_test
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-03-31T00:00:00.000Z
Reasoning: The 90.2% copper recovery for oxide/enriched material is exceptional for a heap leach SXEW process, indicating very favorable metallurgical characteristics for this ore type.
Positive factors
- Exceptional copper recovery for oxide/enriched material via heap leach SXEW
- Significantly de-risks the processing of a major ore component
Evidence · table
“90.2%”
Context: Oxide / Enriched Recoveries
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: 90.2% is at or above the exceptional band (80%)
heap leachGunnison Copper Project · copperRecovery: 59.9 %View all detailsHide details
Identity
- Project
- Gunnison Copper Project
- Commodity
- copper
- Region
- usa_az
- Reported Region
- Cochise Mining District, Arizona, United States
- Ticker
- GCU
Test Work
- Program Status
- preliminary
- Test Type
- heap leach
- Processing Route
- heap leach SXEW
- Sample
- Primary Sulfide (years 10 to 21)
Recovery
- Recovery
- 59.9 %
- Recovery Basis
- actual_test
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-03-31T00:00:00.000Z
Reasoning: The 59.9% copper recovery for primary sulfide material is weak for a heap leach SXEW process, suggesting challenges in extracting copper from this ore type and potentially impacting later mine life economics.
Negative factors
- Weak copper recovery for primary sulfide material via heap leach SXEW
- Indicates potential for lower metal output from this ore type later in mine life
Evidence · table
“59.9%”
Context: Primary Sulfide Recoveries (years 10 to 21)
Tags used in scoring
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: processing_route matches the heap_leach signal
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.