Lion Copper and Gold Corp. Announces Positive Pea Results for Its Yerington, Nevada Copper Project That Includes the Use of Rio Tinto's Nuton Technologies
Original announcement by tmx on
- Company
- Lion Copper and Gold Corp.
- Ticker
- LEO
- Exchange
- TSX
- Region
- Nevada
- Primary commodity
- Copper
- Secondary commodities
- None reported
- Document categories
- Resource update, Economic study, Metallurgy
- Extracted
- 2026-09-18 07:14:24 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Lion Copper and Gold Corp. announced positive Preliminary Economic Assessment (PEA) results for its Yerington Copper Project in Nevada, featuring a post-tax NPV7% of US$356 million and an IRR of 17.4% at a copper price of $3.85/lb. The PEA outlines a 12-year open pit mine life utilizing Rio Tinto's Nuton technologies for processing primary sulfide copper, eliminating the need for a concentrator and tailings impoundment. The release also includes updated mineral resource estimates for the Yerington Deposit, W-3 Stockpile, and VLT, alongside historical estimates for the MacArthur Deposit.
Reasoning: The document announces positive PEA results for the Yerington Copper Project, highlighting strong economics and the use of innovative Nuton technologies for sulfide processing. It also provides updated mineral resource estimates for Yerington, W-3 Stockpile, and VLT, along with historical estimates for MacArthur, and detailed metallurgical recovery projections. The PEA's preliminary nature and reliance on inferred resources are noted.
Positive factors
- Positive PEA results with strong post-tax IRR and NPV
- Utilization of innovative Nuton technologies for sulfide processing, eliminating concentrator and tailings
- Low overall open pit strip ratio
- Significant contained copper in resource estimates across multiple deposits
- High copper recoveries projected for both oxide and sulfide materials
Negative factors
- PEA is preliminary in nature and includes inferred mineral resources
- MacArthur resource estimate is historical and not updated in this release
- No explicit disclosure of the PEA's effective base date, only the publication date
Low confidence — this extraction should be reviewed alongside the original source.
Facts used in scoring: 32
Classification and evidence
PEA Onlyneutral
Only Class 4 / Initial Assessment economics available. Not bankable.
Why it applies: The economic assessment is explicitly stated as a Preliminary Economic Assessment (PEA).
Evidence · text
“Preliminary Economic Assessment (" PEA ")”
Inferred Heavy Feednegative
Material Inferred share of LOM mill feed, or the share is undisclosed.
Why it applies: The PEA explicitly states it 'includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves'.
Evidence · text
“The PEA is preliminary in nature, includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves”
High IRRpositive
Post-tax real unlevered IRR in the strong tier or better.
Why it applies: The post-tax IRR of 17.4% is in the strong tier for economic studies.
Evidence · table
“17.4”
Context: IRR
Fast Paybackpositive
Payback in the strong tier or better, on the required basis.
Why it applies: The post-tax payback period of 5.0 years is in the moderate tier.
Evidence · table
“5.0”
Context: Payback Period
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 are named as responsible for the PEA Technical Report and have reviewed the news release.
Evidence · text
“The Qualified Persons (QPs), as that term is defined in NI 43-101, responsible for the preparation of the PEA Technical Report, include: Gordon Zurowski, P.Eng., Principal Mine Engineer (AGP Mining Consultants Inc.) Tim Maunula, P.Geo, Principal Resource Geologist (T. Maunula & Associates Consulting Inc.) - Yerington Mineral Resource estimate Herb Welhener, MMSA-QPM, Vice President (Independent Mining Consultants, Inc.) - MacArthur Mineral Resource estimate Adrien Butler, P.E., Senior Civil Engineer (NewFields) Jeff Woods, QP, Principal Process Engineer (Woods Process Services, LLC)”
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: The PEA was prepared in accordance with Canadian National Instrument 43-101.
Evidence · text
“prepared in accordance with the requirements set forth by Canadian National Instrument 43-101 (" NI 43-101 ")”
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: The projected copper recovery for Yerington Sulfide-Nuton is 74%, which is strong for a heap leach process.
Evidence · table
“74%”
Context: Yerington Sulfide-Nuton
Pilot Scale Completepositive
Pilot or demonstration plant testing completed under continuous operation.
Why it applies: The Nuton technologies are described as a 'proprietary catalytic bio-heap leaching innovation' and are being evaluated, with further testing slated to confirm metallurgical performance.
Evidence · text
“Nuton technologies are being evaluated to enable the unlocking of primary sulfide copper resources in a more cost-efficient, environmentally friendly manner, and affording the unique opportunity to produce copper cathode on-site for domestic consumption. ... Further testing of Nuton technologies is slated to confirm metallurgical performance through replicate trials, with completion anticipated in 2024.”
Resource Updateneutral
Revised estimate for an existing resource — compare to prior to assess progress.
Why it applies: The document provides updated mineral resource estimates for the Yerington Deposit, W-3 Stockpile, and VLT.
Evidence · text
“The updated Mineral Resources for the Yerington Deposit are: Measured Resources of 62.9 Mtons at 0.30% TCu; Indicated Resources of 94.7 Mtons at 0.27% TCu; and Inferred Resources of 113.2 Mtons at 0.22% TCu (Table 6).”
Stale Estimatenegative
Effective date is >2 years old — data currency concern, may not reflect current geological understanding.
Why it applies: The MacArthur Mineral Resource estimate has an effective date of February 25, 2022, which is more than two years old.
Evidence · text
“The effective date of the MacArthur Mineral Resource estimate is February 25, 2022.”
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: A current resource fact retains the disclosed cut-off grade
Heap Leach Routeneutral
Processing via heap leach — lower CAPEX and OPEX, lower recovery expected.
Why it applies: the document describes a heap_leach route ("heap leach")
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: the document describes a mill_cil route ("concentrator")
Multi-Domain Testedpositive
Variability across ore domains (oxide, transition, fresh) has been addressed.
Why it applies: 6 distinct composites were tested
Extracted facts
Stored fact records: 30. Some facts used in scoring do not have a stored record.
Resource Estimates (23)
measuredYerington Deposit · copperTonnes: 20230000Grade: 0.25Grade Unit: %Contained Metal: 99367000Contained Unit: lbsView all detailsHide details
Identity
- Project
- Yerington Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2023-05-01T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Tim Maunula
- Resource group id
- resource:abf7f940c3ebc3c967fe
- Deposit or zone
- Yerington Deposit
- Material type
- oxide
Resource Data
- Category
- measured
- Tonnes
- 20230000
- Grade
- 0.25
- Grade Unit
- %
- Contained Metal
- 99367000
- Contained Unit
- lbs
- Cutoff Grade
- 0.038
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2023-05-01
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Measured Oxide resource of 20.23 Mtons at 0.25% TCu represents a high-confidence portion of the Yerington Deposit, contributing significantly to the project's overall resource base.
Positive factors
- Measured category indicates high confidence
- Good contained copper for oxide material
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
measuredYerington Deposit · copperTonnes: 42671000Grade: 0.32Grade Unit: %Contained Metal: 274578000Contained Unit: lbsView all detailsHide details
Identity
- Project
- Yerington Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2023-05-01T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Tim Maunula
- Resource group id
- resource:f847c01eae7601e70bf9
- Deposit or zone
- Yerington Deposit
- Material type
- sulphide
Resource Data
- Category
- measured
- Tonnes
- 42671000
- Grade
- 0.32
- Grade Unit
- %
- Contained Metal
- 274578000
- Contained Unit
- lbs
- Cutoff Grade
- 0.126
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2023-05-01
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Measured Sulfide resource of 42.67 Mtons at 0.32% TCu is a significant, high-confidence component of the Yerington Deposit, especially given the planned Nuton processing for sulfides.
Positive factors
- Measured category indicates high confidence
- Higher grade and contained copper for sulfide material
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
measuredYerington Deposit · copperTonnes: 62901000Grade: 0.3Grade Unit: %Contained Metal: 373945000Contained Unit: lbsView all detailsHide details
Identity
- Project
- Yerington Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2023-05-01T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Tim Maunula
- Resource group id
- resource:8a314529cdea6bfb521b
- Deposit or zone
- Yerington Deposit
Resource Data
- Category
- measured
- Tonnes
- 62901000
- Grade
- 0.3
- Grade Unit
- %
- Contained Metal
- 373945000
- Contained Unit
- lbs
Prior Estimate
- Resource Date
- 2023-05-01
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The total Measured resource of 62.9 Mtons at 0.30% TCu provides a solid, high-confidence foundation for the Yerington project.
Positive factors
- Large Measured resource base for the Yerington Deposit
- High confidence in the resource estimate
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 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
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
indicatedYerington Deposit · copperTonnes: 13749000Grade: 0.22Grade Unit: %Contained Metal: 60166000Contained Unit: lbsView all detailsHide details
Identity
- Project
- Yerington Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2023-05-01T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Tim Maunula
- Resource group id
- resource:5162107302d3e5969ecb
- Deposit or zone
- Yerington Deposit
- Material type
- oxide
Resource Data
- Category
- indicated
- Tonnes
- 13749000
- Grade
- 0.22
- Grade Unit
- %
- Contained Metal
- 60166000
- Contained Unit
- lbs
- Cutoff Grade
- 0.038
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2023-05-01
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Indicated Oxide resource of 13.75 Mtons at 0.22% TCu adds to the project's resource base with reasonable confidence, supporting future economic studies.
Positive factors
- Indicated category provides reasonable geological confidence
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
indicatedYerington Deposit · copperTonnes: 80960000Grade: 0.28Grade Unit: %Contained Metal: 457921000Contained Unit: lbsView all detailsHide details
Identity
- Project
- Yerington Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2023-05-01T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Tim Maunula
- Resource group id
- resource:21e1fefb808637761ce2
- Deposit or zone
- Yerington Deposit
- Material type
- sulphide
Resource Data
- Category
- indicated
- Tonnes
- 80960000
- Grade
- 0.28
- Grade Unit
- %
- Contained Metal
- 457921000
- Contained Unit
- lbs
- Cutoff Grade
- 0.126
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2023-05-01
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Indicated Sulfide resource of 80.96 Mtons at 0.28% TCu is a substantial component, providing reasonable confidence for future mine planning, especially with the Nuton technology.
Positive factors
- Large Indicated Sulfide resource
- Reasonable geological confidence
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
indicatedYerington Deposit · copperTonnes: 94709000Grade: 0.27Grade Unit: %Contained Metal: 518087000Contained Unit: lbsView all detailsHide details
Identity
- Project
- Yerington Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2023-05-01T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Tim Maunula
- Resource group id
- resource:0296152d4d5aa40a0f1b
- Deposit or zone
- Yerington Deposit
Resource Data
- Category
- indicated
- Tonnes
- 94709000
- Grade
- 0.27
- Grade Unit
- %
- Contained Metal
- 518087000
- Contained Unit
- lbs
Prior Estimate
- Resource Date
- 2023-05-01
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The total Indicated resource of 94.71 Mtons at 0.27% TCu significantly contributes to the project's overall resource, providing a good level of confidence for ongoing development.
Positive factors
- Substantial Indicated resource base for the Yerington Deposit
- Reasonable confidence for future studies
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
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
inferredYerington Deposit · copperTonnes: 33347000Grade: 0.18Grade Unit: %Contained Metal: 122221000Contained Unit: lbsView all detailsHide details
Identity
- Project
- Yerington Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2023-05-01T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Tim Maunula
- Resource group id
- resource:ba105102cfcbce3b11a4
- Deposit or zone
- Yerington Deposit
- Material type
- oxide
Resource Data
- Category
- inferred
- Tonnes
- 33347000
- Grade
- 0.18
- Grade Unit
- %
- Contained Metal
- 122221000
- Contained Unit
- lbs
- Cutoff Grade
- 0.038
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2023-05-01
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Inferred Oxide resource of 33.35 Mtons at 0.18% TCu provides exploration upside but has lower confidence and cannot be used for economic studies alone.
Negative factors
- Inferred category indicates lower geological confidence
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
inferredYerington Deposit · copperTonnes: 79881000Grade: 0.24Grade Unit: %Contained Metal: 385938000Contained Unit: lbsView all detailsHide details
Identity
- Project
- Yerington Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2023-05-01T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Tim Maunula
- Resource group id
- resource:d13958ba90c61bb0cb15
- Deposit or zone
- Yerington Deposit
- Material type
- sulphide
Resource Data
- Category
- inferred
- Tonnes
- 79881000
- Grade
- 0.24
- Grade Unit
- %
- Contained Metal
- 385938000
- Contained Unit
- lbs
- Cutoff Grade
- 0.126
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2023-05-01
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Inferred Sulfide resource of 79.88 Mtons at 0.24% TCu represents a significant target for future drilling to upgrade its confidence, especially with the Nuton processing technology.
Positive factors
- Large Inferred Sulfide resource provides future potential
Negative factors
- Inferred category indicates lower geological confidence
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
inferredYerington Deposit · copperTonnes: 113229000Grade: 0.22Grade Unit: %Contained Metal: 508159000Contained Unit: lbsView all detailsHide details
Identity
- Project
- Yerington Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2023-05-01T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Tim Maunula
- Resource group id
- resource:4810adf30f584a131393
- Deposit or zone
- Yerington Deposit
Resource Data
- Category
- inferred
- Tonnes
- 113229000
- Grade
- 0.22
- Grade Unit
- %
- Contained Metal
- 508159000
- Contained Unit
- lbs
Prior Estimate
- Resource Date
- 2023-05-01
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The total Inferred resource of 113.23 Mtons at 0.22% TCu represents a substantial exploration target, but its speculative nature means it cannot be directly incorporated into current economic studies.
Positive factors
- Significant total Inferred resource for the Yerington Deposit
Negative factors
- Inferred category limits current economic applicability
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
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
inferredW-3 Stockpile · copperTonnes: 14100000Grade: 0.11Grade Unit: %Contained Metal: 30571000Contained Unit: lbsView all detailsHide details
Identity
- Project
- W-3 Stockpile
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2023-07-31T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Tim Maunula
- Resource group id
- resource:03df0024390684262115
- Deposit or zone
- W-3 Stockpile
- Material type
- oxide
Resource Data
- Category
- inferred
- Tonnes
- 14100000
- Grade
- 0.11
- Grade Unit
- %
- Contained Metal
- 30571000
- Contained Unit
- lbs
- Cutoff Grade
- 0.04
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2023-07-31
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Inferred resource in the W-3 Stockpile represents potential value from historical operations, but its low grade and inferred classification mean it requires further evaluation.
Positive factors
- Identified resource in existing stockpile
Negative factors
- Inferred category indicates lower confidence
- Low grade for oxide material
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
inferredVat-Leached Tailings · copperTonnes: 33160000Grade: 0.09Grade Unit: %Contained Metal: 62622000Contained Unit: lbsView all detailsHide details
Identity
- Project
- Vat-Leached Tailings
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2023-07-31T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Tim Maunula
- Resource group id
- resource:1c28648435fde7a91ef9
- Deposit or zone
- Vat-Leached Tailings
- Material type
- oxide
Resource Data
- Category
- inferred
- Tonnes
- 33160000
- Grade
- 0.09
- Grade Unit
- %
- Contained Metal
- 62622000
- Contained Unit
- lbs
- Cutoff Grade
- 0.04
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2023-07-31
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Inferred resource in the Vat-Leached Tailings represents potential value from historical processing, but its very low grade and inferred classification require significant de-risking.
Positive factors
- Identified resource in existing tailings
Negative factors
- Inferred category indicates lower confidence
- Very low grade for oxide material
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
measuredMacArthur Deposit · copperTonnes: 116666000Grade: 0.18Grade Unit: %Contained Metal: 420929000Contained Unit: lbsHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- MacArthur Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2022-02-25T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Herb Welhener
- Resource group id
- resource:1b70c3932e75b9dba38a
- Deposit or zone
- MacArthur Deposit
Resource Data
- Category
- measured
- Tonnes
- 116666000
- Grade
- 0.18
- Grade Unit
- %
- Contained Metal
- 420929000
- Contained Unit
- lbs
Prior Estimate
- Resource Date
- 2022-02-25
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2022-02-25T00:00:00.000Z
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Measured resource of 116.67 Mtons at 0.18% TCu for MacArthur is substantial but is historical, reducing its novelty and requiring an update for current project evaluation.
Positive factors
- Large Measured resource base for MacArthur Deposit
Negative factors
- Estimate is historical, effective date is over two years old
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 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
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
indicatedMacArthur Deposit · copperTonnes: 183665000Grade: 0.158Grade Unit: %Contained Metal: 579479000Contained Unit: lbsHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- MacArthur Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2022-02-25T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Herb Welhener
- Resource group id
- resource:a0206d0890bf76690694
- Deposit or zone
- MacArthur Deposit
Resource Data
- Category
- indicated
- Tonnes
- 183665000
- Grade
- 0.158
- Grade Unit
- %
- Contained Metal
- 579479000
- Contained Unit
- lbs
Prior Estimate
- Resource Date
- 2022-02-25
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2022-02-25T00:00:00.000Z
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Indicated resource of 183.67 Mtons at 0.158% TCu for MacArthur is substantial but is historical, reducing its novelty and requiring an update for current project evaluation.
Positive factors
- Large Indicated resource base for MacArthur Deposit
Negative factors
- Estimate is historical, effective date is over two years old
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
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
inferredMacArthur Deposit · copperTonnes: 156450000Grade: 0.151Grade Unit: %Contained Metal: 471714000Contained Unit: lbsHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- MacArthur Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2022-02-25T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Herb Welhener
- Resource group id
- resource:3a7c3d15fa437600ff62
- Deposit or zone
- MacArthur Deposit
Resource Data
- Category
- inferred
- Tonnes
- 156450000
- Grade
- 0.151
- Grade Unit
- %
- Contained Metal
- 471714000
- Contained Unit
- lbs
Prior Estimate
- Resource Date
- 2022-02-25
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2022-02-25T00:00:00.000Z
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Inferred resource of 156.45 Mtons at 0.151% TCu for MacArthur is a large exploration target, but its historical nature and inferred classification reduce its current utility for economic studies.
Positive factors
- Significant Inferred resource base for MacArthur Deposit
Negative factors
- Estimate is historical, effective date is over two years old
- Inferred category indicates lower confidence
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
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
measuredMacArthur Deposit · copperTonnes: 82983000Grade: 0.184Grade Unit: %Contained Metal: 305303000Contained Unit: lbsHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- MacArthur Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2022-02-25T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Herb Welhener
- Resource group id
- resource:4e0ceb0065649646e4b8
- Deposit or zone
- MacArthur
Resource Data
- Category
- measured
- Tonnes
- 82983000
- Grade
- 0.184
- Grade Unit
- %
- Contained Metal
- 305303000
- Contained Unit
- lbs
- Cutoff Grade
- 0.06
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2022-02-25
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2022-02-25T00:00:00.000Z
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Measured resource for the MacArthur domain is a significant, high-confidence component, but its historical nature means it needs to be updated for current project planning.
Positive factors
- Large Measured resource for the MacArthur domain
Negative factors
- Estimate is historical, effective date is over two years old
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
measuredMacArthur Deposit · copperTonnes: 25149000Grade: 0.176Grade Unit: %Contained Metal: 88507000Contained Unit: lbsHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- MacArthur Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2022-02-25T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Herb Welhener
- Resource group id
- resource:950195ca39912fca10c8
- Deposit or zone
- North Ridge
Resource Data
- Category
- measured
- Tonnes
- 25149000
- Grade
- 0.176
- Grade Unit
- %
- Contained Metal
- 88507000
- Contained Unit
- lbs
- Cutoff Grade
- 0.06
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2022-02-25
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2022-02-25T00:00:00.000Z
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Measured resource for the North Ridge domain is a high-confidence component, but its historical nature means it needs to be updated for current project planning.
Positive factors
- Measured resource for the North Ridge domain
Negative factors
- Estimate is historical, effective date is over two years old
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
measuredMacArthur Deposit · copperTonnes: 8534000Grade: 0.159Grade Unit: %Contained Metal: 27119000Contained Unit: lbsHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- MacArthur Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2022-02-25T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Herb Welhener
- Resource group id
- resource:4dd114fb4af5f4e2d5a5
- Deposit or zone
- Gallagher
Resource Data
- Category
- measured
- Tonnes
- 8534000
- Grade
- 0.159
- Grade Unit
- %
- Contained Metal
- 27119000
- Contained Unit
- lbs
- Cutoff Grade
- 0.06
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2022-02-25
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2022-02-25T00:00:00.000Z
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Measured resource for the Gallagher domain is a high-confidence component, but its historical nature means it needs to be updated for current project planning.
Positive factors
- Measured resource for the Gallagher domain
Negative factors
- Estimate is historical, effective date is over two years old
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
indicatedMacArthur Deposit · copperTonnes: 77171000Grade: 0.151Grade Unit: %Contained Metal: 233446000Contained Unit: lbsHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- MacArthur Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2022-02-25T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Herb Welhener
- Resource group id
- resource:4aaffcbd4a5755a82b31
- Deposit or zone
- MacArthur
Resource Data
- Category
- indicated
- Tonnes
- 77171000
- Grade
- 0.151
- Grade Unit
- %
- Contained Metal
- 233446000
- Contained Unit
- lbs
- Cutoff Grade
- 0.06
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2022-02-25
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2022-02-25T00:00:00.000Z
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Indicated resource for the MacArthur domain is a significant component, but its historical nature means it needs to be updated for current project planning.
Positive factors
- Large Indicated resource for the MacArthur domain
Negative factors
- Estimate is historical, effective date is over two years old
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
indicatedMacArthur Deposit · copperTonnes: 78305000Grade: 0.166Grade Unit: %Contained Metal: 259558000Contained Unit: lbsHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- MacArthur Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2022-02-25T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Herb Welhener
- Resource group id
- resource:cdf01abd78a7143fe7d0
- Deposit or zone
- North Ridge
Resource Data
- Category
- indicated
- Tonnes
- 78305000
- Grade
- 0.166
- Grade Unit
- %
- Contained Metal
- 259558000
- Contained Unit
- lbs
- Cutoff Grade
- 0.06
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2022-02-25
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2022-02-25T00:00:00.000Z
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Indicated resource for the North Ridge domain is a significant component, but its historical nature means it needs to be updated for current project planning.
Positive factors
- Large Indicated resource for the North Ridge domain
Negative factors
- Estimate is historical, effective date is over two years old
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
indicatedMacArthur Deposit · copperTonnes: 28189000Grade: 0.153Grade Unit: %Contained Metal: 86475000Contained Unit: lbsHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- MacArthur Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2022-02-25T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Herb Welhener
- Resource group id
- resource:374381f03c7d2a858a2b
- Deposit or zone
- Gallagher
Resource Data
- Category
- indicated
- Tonnes
- 28189000
- Grade
- 0.153
- Grade Unit
- %
- Contained Metal
- 86475000
- Contained Unit
- lbs
- Cutoff Grade
- 0.06
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2022-02-25
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2022-02-25T00:00:00.000Z
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Indicated resource for the Gallagher domain is a component of the overall resource, but its historical nature means it needs to be updated for current project planning.
Positive factors
- Indicated resource for the Gallagher domain
Negative factors
- Estimate is historical, effective date is over two years old
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
inferredMacArthur Deposit · copperTonnes: 30815000Grade: 0.158Grade Unit: %Contained Metal: 97490000Contained Unit: lbsHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- MacArthur Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2022-02-25T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Herb Welhener
- Resource group id
- resource:13a8b623b0f40ca6b3f1
- Deposit or zone
- MacArthur
Resource Data
- Category
- inferred
- Tonnes
- 30815000
- Grade
- 0.158
- Grade Unit
- %
- Contained Metal
- 97490000
- Contained Unit
- lbs
- Cutoff Grade
- 0.06
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2022-02-25
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2022-02-25T00:00:00.000Z
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Inferred resource for the MacArthur domain is a significant target, but its historical nature and inferred classification reduce its current utility for economic studies.
Positive factors
- Inferred resource for the MacArthur domain
Negative factors
- Estimate is historical, effective date is over two years old
- Inferred category indicates lower confidence
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
inferredMacArthur Deposit · copperTonnes: 62593000Grade: 0.154Grade Unit: %Contained Metal: 192187000Contained Unit: lbsHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- MacArthur Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2022-02-25T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Herb Welhener
- Resource group id
- resource:f1058330e8ab94caf68a
- Deposit or zone
- North Ridge
Resource Data
- Category
- inferred
- Tonnes
- 62593000
- Grade
- 0.154
- Grade Unit
- %
- Contained Metal
- 192187000
- Contained Unit
- lbs
- Cutoff Grade
- 0.06
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2022-02-25
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2022-02-25T00:00:00.000Z
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Inferred resource for the North Ridge domain is a significant target, but its historical nature and inferred classification reduce its current utility for economic studies.
Positive factors
- Large Inferred resource for the North Ridge domain
Negative factors
- Estimate is historical, effective date is over two years old
- Inferred category indicates lower confidence
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
inferredMacArthur Deposit · copperTonnes: 63042000Grade: 0.144Grade Unit: %Contained Metal: 182037000Contained Unit: lbsHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- MacArthur Deposit
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Resource scope
- Estimate type
- resource
- Effective date
- 2022-02-25T00:00:00.000Z
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Herb Welhener
- Resource group id
- resource:9713386636d51af03b94
- Deposit or zone
- Gallagher
Resource Data
- Category
- inferred
- Tonnes
- 63042000
- Grade
- 0.144
- Grade Unit
- %
- Contained Metal
- 182037000
- Contained Unit
- lbs
- Cutoff Grade
- 0.06
- Cutoff Unit
- %
Prior Estimate
- Resource Date
- 2022-02-25
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2022-02-25T00:00:00.000Z
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: The Inferred resource for the Gallagher domain is a significant target, but its historical nature and inferred classification reduce its current utility for economic studies.
Positive factors
- Significant Inferred resource for the Gallagher domain
Negative factors
- Estimate is historical, effective date is over two years old
- Inferred category indicates lower confidence
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 (7)
heap leachYerington Copper Project · copperRecovery: 82 %View all detailsHide details
Identity
- Project
- Yerington Copper Project
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Test Work
- Program Status
- preliminary
- Test Type
- heap leach
- Processing Route
- heap leach
- Sample
- MacArthur Oxide
Recovery
- Recovery
- 82 %
- Recovery Basis
- actual_test
Reagents
- Reagent Notes
- Sized to 6" minus ROM
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: An 82% recovery for MacArthur Oxide material via heap leach is a strong result, indicating efficient extraction for this ore type.
Positive factors
- High recovery for oxide material via heap leach
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: 82% is at or above the exceptional band (80%)
heap leachYerington Copper Project · copperRecovery: 54 %View all detailsHide details
Identity
- Project
- Yerington Copper Project
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Test Work
- Program Status
- preliminary
- Test Type
- heap leach
- Processing Route
- heap leach
- Sample
- Gallagher Oxide
Recovery
- Recovery
- 54 %
- Recovery Basis
- actual_test
Reagents
- Reagent Notes
- Sized to 6" minus
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: A 54% recovery for Gallagher Oxide material is low for a heap leach process, suggesting potential challenges or lower amenability for this specific domain.
Negative factors
- Recovery is below the weak band for heap leach oxide copper
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 leachYerington Copper Project · copperRecovery: 53 %View all detailsHide details
Identity
- Project
- Yerington Copper Project
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Test Work
- Program Status
- preliminary
- Test Type
- heap leach
- Processing Route
- heap leach
- Sample
- North Area Oxide
Recovery
- Recovery
- 53 %
- Recovery Basis
- actual_test
Reagents
- Reagent Notes
- Sized to 6" minus
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: A 53% recovery for North Area Oxide material is low for a heap leach process, similar to Gallagher, indicating potential processing challenges for this domain.
Negative factors
- Recovery is below the weak band for heap leach oxide copper
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 leachYerington Copper Project · copperRecovery: 70 %View all detailsHide details
Identity
- Project
- Yerington Copper Project
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Test Work
- Program Status
- preliminary
- Test Type
- heap leach
- Processing Route
- heap leach
- Sample
- Yerington Oxide
Recovery
- Recovery
- 70 %
- Recovery Basis
- actual_test
Reagents
- Reagent Notes
- ROM
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: A 70% recovery for Yerington Oxide material via ROM heap leach is a moderate result, indicating reasonable amenability to this processing method.
Positive factors
- Recovery is within the moderate band for heap leach oxide copper
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 leachYerington Copper Project · copperRecovery: 68 %View all detailsHide details
Identity
- Project
- Yerington Copper Project
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Test Work
- Program Status
- preliminary
- Test Type
- heap leach
- Processing Route
- heap leach
- Sample
- W3 Oxide
Recovery
- Recovery
- 68 %
- Recovery Basis
- actual_test
Reagents
- Reagent Notes
- ROM
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: A 68% recovery for W3 Oxide material via ROM heap leach is a moderate result, indicating reasonable amenability to this processing method.
Positive factors
- Recovery is within the moderate band for heap leach oxide copper
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 leachYerington Copper Project · copperRecovery: 75 %View all detailsHide details
Identity
- Project
- Yerington Copper Project
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Test Work
- Program Status
- preliminary
- Test Type
- heap leach
- Processing Route
- heap leach
- Sample
- VLT Oxide
Recovery
- Recovery
- 75 %
- Recovery Basis
- actual_test
Reagents
- Reagent Notes
- ROM
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: A 75% recovery for VLT Oxide material via ROM heap leach is a strong result, indicating good amenability to this processing method.
Positive factors
- Recovery is strong for heap leach oxide copper
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 leachYerington Copper Project · copperRecovery: 74 %View all detailsHide details
Identity
- Project
- Yerington Copper Project
- Commodity
- copper
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- LEO
Test Work
- Program Status
- preliminary
- Test Type
- heap leach
- Processing Route
- Tertiary Crushed Agglomerated Conveyor Stacked: Nuton Process
- Sample
- Yerington Sulfide-Nuton
Recovery
- Recovery
- 74 %
- Recovery Basis
- actual_test
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2024-01-30T00:00:00.000Z
Reasoning: A 74% recovery for sulfide material using the Nuton process is a strong and novel result, as it enables heap leaching of sulfides, which traditionally require more complex processing. This is a key de-risking factor for the project.
Positive factors
- Strong recovery for sulfide material using innovative Nuton technology
- Nuton process eliminates need for concentrator and tailings impoundment
Negative factors
- Test work remains ongoing and subject to refinement
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.