NEVGOLD ANNOUNCES MINERAL RESOURCE: ANTIMONY OF 29,600 TONNES MEASURED & INDICATED (0.26%) AND 48,100 TONNES INFERRED (0.18%); 100% OXIDE GOLD OF 181,400 OZS MEASURED & INDICATED AND 1,203,500 OZS INFERRED; STRATEGIC U.S. ANTIMONY RESOURCE
Original announcement by tmx on
- Company
- NevGold Corp.
- Ticker
- NAU
- Exchange
- TSX
- Region
- Nevada
- Primary commodity
- Antimony
- Secondary commodities
- Gold, Silver
- Document categories
- Resource update
- Extracted
- 2026-09-12 14:39:35 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
NevGold Corp. announced a maiden Mineral Resource Estimate for its Limo Butte Project in Nevada, defining 29,600 tonnes of Measured & Indicated antimony (0.26%) and 48,100 tonnes of Inferred antimony (0.18%). The estimate also includes 181,400 ounces of Measured & Indicated oxide gold (0.37 g/t) and 1,203,500 ounces of Inferred oxide gold (0.32 g/t). This MRE establishes a strategic U.S. antimony resource and provides a pathway for potential near-term antimony production from already mined surface material, with significant expansion potential identified for future drilling.
Reasoning: NevGold announced its maiden Mineral Resource Estimate for the Limo Butte Project, establishing a significant gold-antimony resource in Nevada. The MRE includes substantial Measured and Indicated resources for both commodities, with a focus on strategic antimony supply and oxide gold. The estimate is NI 43-101 compliant and provides a strong foundation for future project development, including potential near-term antimony production.
Positive factors
- Maiden Mineral Resource Estimate for gold and antimony
- Defines a strategic U.S. antimony resource
- Includes Measured, Indicated, and Inferred categories for both commodities
- 100% oxide gold amenable to heap leaching
- NI 43-101 compliant and signed off by a Qualified Person
- Potential for near-term antimony production from surface material
- Significant potential for resource expansion with ongoing drill programs
Negative factors
- High proportion of Inferred resources (87% of total gold ounces, 72% of total antimony tonnes)
- No prior MRE for direct comparison of growth metrics
Low confidence — this extraction should be reviewed alongside the original source.
Facts used in scoring: 73
Classification and evidence
Maiden Resourceneutral
First formal MRE for the project — establishes baseline but typically exploration-stage with high Inferred component. No prior estimate exists, so every change band is not applicable.
Why it applies: The document explicitly states this is NevGold's 'maiden gold-antimony Mineral Resource Estimate'.
Evidence · text
“NevGold is pleased to announce its maiden gold-antimony Mineral Resource Estimate (“ MRE ”)”
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: Mr. Greg Mosher (P.Geo., M.Sc. Applied), Principal of GMRS, is named as an independent 'Qualified Person' under NI 43-101 and is responsible for the MRE.
Evidence · text
“Mr. Greg Mosher (P.Geo., M.Sc. Applied), Principal of GMRS is an independent “Qualified Person” under NI 43-101 and is responsible for the MRE.”
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: The mineral resources have been estimated in accordance with Canadian Institute of Mining, Metallurgy and Petroleum definitions, as required under National Instrument 43-101.
Evidence · text
“All mineral resources have been estimated in accordance with Canadian Institute of Mining, Metallurgy and Petroleum definitions, as required under 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 document clearly states various cut-off grades used for the resource estimate, including 0.30 g/t AuEq., 0.15 g/t Au, and 0.1% Sb.
Evidence · text
“Mineral Resources for Leach Pads, Pre-Strip Dump, Resurrection, and Cadillac Valley are reported at a cut-off grade of 0.30 g/t AuEq.”
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: A significant portion of the resource is classified as Inferred, including 1,203,500 oz of gold and 48,100 tonnes of antimony.
Evidence · text
“1,203,500 OZS INFERRED; STRATEGIC U.S. ANTIMONY RESOURCE”
Measured Resourcepositive
Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves.
Why it applies: The MRE includes Measured resources, such as 9,500 oz gold and 2,600 tonnes antimony in the Leach Pads zone.
Evidence · table
“Measured”
Context: Leach Pads
Indicated Resourcepositive
Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves.
Why it applies: The MRE includes Indicated resources, such as 171,900 oz gold and 27,000 tonnes antimony across various zones.
Evidence · table
“Indicated”
Context: Leach Pads
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: The company states 'Preliminary Economic Assessment (“PEA”) on Resurrection Ridge, Cadillac Valley, and Northern Zones focused on gold-antimony' as a next step.
Evidence · text
“Preliminary Economic Assessment (“PEA”) on Resurrection Ridge, Cadillac Valley, and Northern Zones focused on gold-antimony”
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: The company states 'Further metallurgical testwork to advance the Project to a Prefeasibility Study (“PFS”)' as a next step.
Evidence · text
“Further metallurgical testwork to advance the Project to a Prefeasibility Study (“PFS”) on the near-term antimony production scenario”
Extracted facts
Stored fact records: 73. Some facts used in scoring do not have a stored record.
Resource Estimates (73)
measuredLimo Butte · goldTonnes: 1000000Grade: 0.31Grade Unit: g/tContained Metal: 9500Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:90c985faa1065a5e4f66
- Deposit or zone
- Leach Pads
- Mining method
- open_pit
Resource Data
- Category
- measured
- Tonnes
- 1000000
- Grade
- 0.31
- Grade Unit
- g/t
- Contained Metal
- 9500
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured resource for gold in the Leach Pads zone, contributing to the overall project's initial resource definition.
Positive factors
- Maiden Measured resource for gold
- Part of a strategic dual-commodity MRE
Evidence · table
“0.31”
Context: 1.0
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
measuredLimo Butte · silverTonnes: 1000000Grade: 2.8Grade Unit: g/tContained Metal: 87000Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:90c985faa1065a5e4f66
- Deposit or zone
- Leach Pads
- Mining method
- open_pit
Resource Data
- Category
- measured
- Tonnes
- 1000000
- Grade
- 2.8
- Grade Unit
- g/t
- Contained Metal
- 87000
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured resource for silver in the Leach Pads zone, providing byproduct potential within the overall resource.
Positive factors
- Maiden Measured resource for silver
- Byproduct credit in a dual-commodity MRE
Evidence · table
“2.80”
Context: 1.0
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
measuredLimo Butte · antimonyTonnes: 1000000Grade: 0.26Grade Unit: %Contained Metal: 2600Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:90c985faa1065a5e4f66
- Deposit or zone
- Leach Pads
- Mining method
- open_pit
Resource Data
- Category
- measured
- Tonnes
- 1000000
- Grade
- 0.26
- Grade Unit
- %
- Contained Metal
- 2600
- Contained Unit
- t
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured resource for antimony in the Leach Pads zone, representing a component of the strategic U.S. antimony resource.
Positive factors
- Maiden Measured resource for strategic antimony
- Contributes to potential near-term production from surface material
Evidence · table
“0.26%”
Context: 1.0
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · goldTonnes: 1200000Grade: 0.29Grade Unit: g/tContained Metal: 11600Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:d3191bbeee227ee46769
- Deposit or zone
- Leach Pads
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 1200000
- Grade
- 0.29
- Grade Unit
- g/t
- Contained Metal
- 11600
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for gold in the Leach Pads zone, contributing to the project's initial resource definition.
Positive factors
- Maiden Indicated resource for gold
- Adds to the overall gold resource base
Evidence · table
“0.29”
Context: 1.2
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · silverTonnes: 1200000Grade: 2.43Grade Unit: g/tContained Metal: 96700Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:d3191bbeee227ee46769
- Deposit or zone
- Leach Pads
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 1200000
- Grade
- 2.43
- Grade Unit
- g/t
- Contained Metal
- 96700
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for silver in the Leach Pads zone, adding to the project's byproduct potential.
Positive factors
- Maiden Indicated resource for silver
- Provides byproduct potential
Evidence · table
“2.43”
Context: 1.2
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · antimonyTonnes: 1200000Grade: 0.3Grade Unit: %Contained Metal: 3700Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:d3191bbeee227ee46769
- Deposit or zone
- Leach Pads
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 1200000
- Grade
- 0.3
- Grade Unit
- %
- Contained Metal
- 3700
- Contained Unit
- t
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for antimony in the Leach Pads zone, adding to the strategic U.S. antimony resource.
Positive factors
- Maiden Indicated resource for strategic antimony
- Contributes to potential near-term production from surface material
Evidence · table
“0.30%”
Context: 1.2
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · goldTonnes: 90000Grade: 0.3Grade Unit: g/tContained Metal: 900Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:92632e8794bcf5c1e752
- Deposit or zone
- Pre-Strip Dump
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 90000
- Grade
- 0.3
- Grade Unit
- g/t
- Contained Metal
- 900
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for gold in the Pre-Strip Dump zone, contributing to the initial resource definition from existing material.
Positive factors
- Maiden Indicated resource for gold
- From already mined material
Evidence · table
“0.30”
Context: 0.09
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · silverTonnes: 90000Grade: 0.13Grade Unit: g/tContained Metal: 400Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:92632e8794bcf5c1e752
- Deposit or zone
- Pre-Strip Dump
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 90000
- Grade
- 0.13
- Grade Unit
- g/t
- Contained Metal
- 400
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for silver in the Pre-Strip Dump zone, adding to the project's byproduct potential.
Positive factors
- Maiden Indicated resource for silver
- Provides byproduct potential
Evidence · table
“0.13”
Context: 0.09
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · antimonyTonnes: 90000Grade: 0.65Grade Unit: %Contained Metal: 600Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:92632e8794bcf5c1e752
- Deposit or zone
- Pre-Strip Dump
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 90000
- Grade
- 0.65
- Grade Unit
- %
- Contained Metal
- 600
- Contained Unit
- t
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for antimony in the Pre-Strip Dump zone, contributing to the strategic U.S. antimony resource from existing material.
Positive factors
- Maiden Indicated resource for strategic antimony
- Higher grade antimony from already mined material
Evidence · table
“0.65%”
Context: 0.09
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · goldTonnes: 12900000Grade: 0.38Grade Unit: g/tContained Metal: 159400Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:da132a9cc76c1ca88d96
- Deposit or zone
- Resurrection
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 12900000
- Grade
- 0.38
- Grade Unit
- g/t
- Contained Metal
- 159400
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for gold in the Resurrection zone, representing the largest Indicated gold component of the MRE.
Positive factors
- Maiden Indicated resource for gold
- Largest Indicated gold component in the MRE
Evidence · table
“0.38”
Context: 12.9
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · silverTonnes: 12900000Grade: 0.91Grade Unit: g/tContained Metal: 378100Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:da132a9cc76c1ca88d96
- Deposit or zone
- Resurrection
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 12900000
- Grade
- 0.91
- Grade Unit
- g/t
- Contained Metal
- 378100
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for silver in the Resurrection zone, providing significant byproduct potential.
Positive factors
- Maiden Indicated resource for silver
- Significant byproduct potential
Evidence · table
“0.91”
Context: 12.9
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · antimonyTonnes: 12900000Grade: 0.19Grade Unit: %Contained Metal: 24900Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:da132a9cc76c1ca88d96
- Deposit or zone
- Resurrection
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 12900000
- Grade
- 0.19
- Grade Unit
- %
- Contained Metal
- 24900
- Contained Unit
- t
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for antimony in the Resurrection zone, representing the largest Indicated antimony component of the MRE.
Positive factors
- Maiden Indicated resource for strategic antimony
- Largest Indicated antimony component in the MRE
Evidence · table
“0.19%”
Context: 12.9
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · goldTonnes: 15200000Grade: 0.37Grade Unit: g/tContained Metal: 181400Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:1b71f8b181607908d139
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 15200000
- Grade
- 0.37
- Grade Unit
- g/t
- Contained Metal
- 181400
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden total Measured & Indicated resource for gold, providing a substantial base of higher-confidence gold ounces for the project.
Positive factors
- Maiden Measured & Indicated resource for gold
- Significant gold ounces in higher confidence categories
Evidence · table
“0.37”
Context: 15.2
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · silverTonnes: 15200000Grade: 1.15Grade Unit: g/tContained Metal: 562200Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:1b71f8b181607908d139
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 15200000
- Grade
- 1.15
- Grade Unit
- g/t
- Contained Metal
- 562200
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden total Measured & Indicated resource for silver, offering substantial byproduct potential in higher confidence categories.
Positive factors
- Maiden Measured & Indicated resource for silver
- Significant byproduct potential in higher confidence categories
Evidence · table
“1.15”
Context: 15.2
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · antimonyTonnes: 15200000Grade: 0.21Grade Unit: %Contained Metal: 31800Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:1b71f8b181607908d139
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 15200000
- Grade
- 0.21
- Grade Unit
- %
- Contained Metal
- 31800
- Contained Unit
- t
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden total Measured & Indicated resource for antimony, establishing a substantial strategic antimony base in higher confidence categories.
Positive factors
- Maiden Measured & Indicated resource for strategic antimony
- Significant antimony tonnes in higher confidence categories
Evidence · table
“0.21%”
Context: 15.2
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · goldTonnes: 50000Grade: 0.28Grade Unit: g/tContained Metal: 400Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:4ec10cfa03eacaa0658e
- Deposit or zone
- Pre-Strip Dump
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 50000
- Grade
- 0.28
- Grade Unit
- g/t
- Contained Metal
- 400
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for gold in the Pre-Strip Dump zone, contributing to the overall resource from existing material.
Positive factors
- Maiden Inferred resource for gold
- From already mined material
Negative factors
- Lower confidence category
Evidence · table
“0.28”
Context: 0.05
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · silverTonnes: 50000Grade: 0.03Grade Unit: g/tContained Metal: 40Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:4ec10cfa03eacaa0658e
- Deposit or zone
- Pre-Strip Dump
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 50000
- Grade
- 0.03
- Grade Unit
- g/t
- Contained Metal
- 40
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for silver in the Pre-Strip Dump zone, adding to the overall resource with low grade.
Positive factors
- Maiden Inferred resource for silver
Negative factors
- Lower confidence category
- Very low grade
Evidence · table
“0.03”
Context: 0.05
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · antimonyTonnes: 50000Grade: 0.99Grade Unit: %Contained Metal: 500Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:4ec10cfa03eacaa0658e
- Deposit or zone
- Pre-Strip Dump
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 50000
- Grade
- 0.99
- Grade Unit
- %
- Contained Metal
- 500
- Contained Unit
- t
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for antimony in the Pre-Strip Dump zone, contributing to the strategic U.S. antimony resource with high grade.
Positive factors
- Maiden Inferred resource for strategic antimony
- High grade antimony from already mined material
Negative factors
- Lower confidence category
Evidence · table
“0.99%”
Context: 0.05
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · goldTonnes: 28500000Grade: 0.29Grade Unit: g/tContained Metal: 261600Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:f93714e3b7998cf40e78
- Deposit or zone
- Resurrection
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 28500000
- Grade
- 0.29
- Grade Unit
- g/t
- Contained Metal
- 261600
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for gold in the Resurrection zone, adding significant gold ounces to the overall resource.
Positive factors
- Maiden Inferred resource for gold
- Significant gold ounces
Negative factors
- Lower confidence category
Evidence · table
“0.29”
Context: 28.5
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off 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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · silverTonnes: 28500000Grade: 0.87Grade Unit: g/tContained Metal: 799100Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:f93714e3b7998cf40e78
- Deposit or zone
- Resurrection
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 28500000
- Grade
- 0.87
- Grade Unit
- g/t
- Contained Metal
- 799100
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for silver in the Resurrection zone, providing significant byproduct potential.
Positive factors
- Maiden Inferred resource for silver
- Significant byproduct potential
Negative factors
- Lower confidence category
Evidence · table
“0.87”
Context: 28.5
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off 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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · antimonyTonnes: 28500000Grade: 0.12Grade Unit: %Contained Metal: 34600Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:f93714e3b7998cf40e78
- Deposit or zone
- Resurrection
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 28500000
- Grade
- 0.12
- Grade Unit
- %
- Contained Metal
- 34600
- Contained Unit
- t
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for antimony in the Resurrection zone, adding significant antimony tonnes to the strategic U.S. resource.
Positive factors
- Maiden Inferred resource for strategic antimony
- Significant antimony tonnes
Negative factors
- Lower confidence category
Evidence · table
“0.12%”
Context: 28.5
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off 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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · goldTonnes: 57200000Grade: 0.37Grade Unit: g/tContained Metal: 686500Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:0f0d8c9c43ae478f1a7e
- Deposit or zone
- Cadillac Valley
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 57200000
- Grade
- 0.37
- Grade Unit
- g/t
- Contained Metal
- 686500
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for gold in the Cadillac Valley zone, representing the largest Inferred gold component of the MRE.
Positive factors
- Maiden Inferred resource for gold
- Largest Inferred gold component in the MRE
Negative factors
- Lower confidence category
Evidence · table
“0.37”
Context: 57.2
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · silverTonnes: 57200000Grade: 0.49Grade Unit: g/tContained Metal: 895700Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:0f0d8c9c43ae478f1a7e
- Deposit or zone
- Cadillac Valley
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 57200000
- Grade
- 0.49
- Grade Unit
- g/t
- Contained Metal
- 895700
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for silver in the Cadillac Valley zone, providing significant byproduct potential.
Positive factors
- Maiden Inferred resource for silver
- Significant byproduct potential
Negative factors
- Lower confidence category
Evidence · table
“0.49”
Context: 57.2
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · antimonyTonnes: 57200000Grade: 0.07Grade Unit: %Contained Metal: 40600Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:0f0d8c9c43ae478f1a7e
- Deposit or zone
- Cadillac Valley
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 57200000
- Grade
- 0.07
- Grade Unit
- %
- Contained Metal
- 40600
- Contained Unit
- t
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for antimony in the Cadillac Valley zone, representing the largest Inferred antimony component of the MRE.
Positive factors
- Maiden Inferred resource for strategic antimony
- Largest Inferred antimony component in the MRE
Negative factors
- Lower confidence category
Evidence · table
“0.07%”
Context: 57.2
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · goldTonnes: 31700000Grade: 0.25Grade Unit: g/tContained Metal: 255000Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:7fbd01d4a43bf622f201
- Deposit or zone
- Northern Zones
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 31700000
- Grade
- 0.25
- Grade Unit
- g/t
- Contained Metal
- 255000
- Contained Unit
- oz
- Cutoff Grade
- 0.15
- Cutoff Unit
- g/t Au
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for gold in the Northern Zones, adding significant gold ounces to the overall resource, with a lower gold-only cut-off.
Positive factors
- Maiden Inferred resource for gold
- Significant gold ounces
Negative factors
- Lower confidence category
- No antimony data currently available
Evidence · table
“0.25”
Context: 31.7
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · goldTonnes: 117500000Grade: 0.32Grade Unit: g/tContained Metal: 1203500Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:9ad8dd32a1e7bb4198ee
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 117500000
- Grade
- 0.32
- Grade Unit
- g/t
- Contained Metal
- 1203500
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden total Inferred resource for gold, representing a very large gold endowment with significant future potential.
Positive factors
- Maiden Inferred resource for gold
- Very large gold ounces, indicating significant potential
Negative factors
- Lower confidence category
Evidence · table
“0.32”
Context: 117.5
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off 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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · silverTonnes: 117500000Grade: 0.61Grade Unit: g/tContained Metal: 1694840Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:9ad8dd32a1e7bb4198ee
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 117500000
- Grade
- 0.61
- Grade Unit
- g/t
- Contained Metal
- 1694840
- Contained Unit
- oz
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden total Inferred resource for silver, indicating very large byproduct potential for the project.
Positive factors
- Maiden Inferred resource for silver
- Very large byproduct potential
Negative factors
- Lower confidence category
Evidence · table
“0.61”
Context: 117.5
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off 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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · antimonyTonnes: 117500000Grade: 0.09Grade Unit: %Contained Metal: 75700Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:9ad8dd32a1e7bb4198ee
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 117500000
- Grade
- 0.09
- Grade Unit
- %
- Contained Metal
- 75700
- Contained Unit
- t
- Cutoff Grade
- 0.3
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden total Inferred resource for antimony, representing a very large strategic antimony endowment with significant future potential.
Positive factors
- Maiden Inferred resource for strategic antimony
- Very large antimony tonnes, indicating significant potential
Negative factors
- Lower confidence category
Evidence · table
“0.09%”
Context: 117.5
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off 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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
measuredLimo Butte · goldTonnes: 1000000Grade: 0.31Grade Unit: g/tContained Metal: 9500Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:90c985faa1065a5e4f66
- Deposit or zone
- Leach Pads
- Mining method
- open_pit
Resource Data
- Category
- measured
- Tonnes
- 1000000
- Grade
- 0.31
- Grade Unit
- g/t
- Contained Metal
- 9500
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured resource for gold in the Leach Pads zone, reported within the antimony sub-domain, contributing to the overall project's initial resource definition.
Positive factors
- Maiden Measured resource for gold within antimony sub-domain
- Part of a strategic dual-commodity MRE
Evidence · table
“0.31”
Context: 1.0
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
measuredLimo Butte · silverTonnes: 1000000Grade: 2.8Grade Unit: g/tContained Metal: 87000Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:90c985faa1065a5e4f66
- Deposit or zone
- Leach Pads
- Mining method
- open_pit
Resource Data
- Category
- measured
- Tonnes
- 1000000
- Grade
- 2.8
- Grade Unit
- g/t
- Contained Metal
- 87000
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured resource for silver in the Leach Pads zone, reported within the antimony sub-domain, providing byproduct potential.
Positive factors
- Maiden Measured resource for silver within antimony sub-domain
- Byproduct credit in a dual-commodity MRE
Evidence · table
“2.80”
Context: 1.0
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
measuredLimo Butte · antimonyTonnes: 1000000Grade: 0.26Grade Unit: %Contained Metal: 2600Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:90c985faa1065a5e4f66
- Deposit or zone
- Leach Pads
- Mining method
- open_pit
Resource Data
- Category
- measured
- Tonnes
- 1000000
- Grade
- 0.26
- Grade Unit
- %
- Contained Metal
- 2600
- Contained Unit
- t
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured resource for antimony in the Leach Pads zone, reported within the antimony sub-domain, representing a component of the strategic U.S. antimony resource.
Positive factors
- Maiden Measured resource for strategic antimony within antimony sub-domain
- Contributes to potential near-term production from surface material
Evidence · table
“0.26%”
Context: 1.0
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · goldTonnes: 1200000Grade: 0.29Grade Unit: g/tContained Metal: 11600Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:d3191bbeee227ee46769
- Deposit or zone
- Leach Pads
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 1200000
- Grade
- 0.29
- Grade Unit
- g/t
- Contained Metal
- 11600
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for gold in the Leach Pads zone, reported within the antimony sub-domain, contributing to the project's initial resource definition.
Positive factors
- Maiden Indicated resource for gold within antimony sub-domain
- Adds to the overall gold resource base
Evidence · table
“0.29”
Context: 1.2
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · silverTonnes: 1200000Grade: 2.44Grade Unit: g/tContained Metal: 96700Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:d3191bbeee227ee46769
- Deposit or zone
- Leach Pads
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 1200000
- Grade
- 2.44
- Grade Unit
- g/t
- Contained Metal
- 96700
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for silver in the Leach Pads zone, reported within the antimony sub-domain, adding to the project's byproduct potential.
Positive factors
- Maiden Indicated resource for silver within antimony sub-domain
- Provides byproduct potential
Evidence · table
“2.44”
Context: 1.2
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · antimonyTonnes: 1200000Grade: 0.3Grade Unit: %Contained Metal: 3700Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:d3191bbeee227ee46769
- Deposit or zone
- Leach Pads
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 1200000
- Grade
- 0.3
- Grade Unit
- %
- Contained Metal
- 3700
- Contained Unit
- t
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for antimony in the Leach Pads zone, reported within the antimony sub-domain, adding to the strategic U.S. antimony resource.
Positive factors
- Maiden Indicated resource for strategic antimony within antimony sub-domain
- Contributes to potential near-term production from surface material
Evidence · table
“0.30%”
Context: 1.2
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · goldTonnes: 90000Grade: 0.3Grade Unit: g/tContained Metal: 900Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:92632e8794bcf5c1e752
- Deposit or zone
- Pre-Strip Dump
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 90000
- Grade
- 0.3
- Grade Unit
- g/t
- Contained Metal
- 900
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for gold in the Pre-Strip Dump zone, reported within the antimony sub-domain, contributing to the initial resource definition from existing material.
Positive factors
- Maiden Indicated resource for gold within antimony sub-domain
- From already mined material
Evidence · table
“0.30”
Context: 0.09
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · silverTonnes: 90000Grade: 0.13Grade Unit: g/tContained Metal: 400Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:92632e8794bcf5c1e752
- Deposit or zone
- Pre-Strip Dump
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 90000
- Grade
- 0.13
- Grade Unit
- g/t
- Contained Metal
- 400
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for silver in the Pre-Strip Dump zone, reported within the antimony sub-domain, adding to the project's byproduct potential.
Positive factors
- Maiden Indicated resource for silver within antimony sub-domain
- Provides byproduct potential
Evidence · table
“0.13”
Context: 0.09
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · antimonyTonnes: 90000Grade: 0.65Grade Unit: %Contained Metal: 600Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:92632e8794bcf5c1e752
- Deposit or zone
- Pre-Strip Dump
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 90000
- Grade
- 0.65
- Grade Unit
- %
- Contained Metal
- 600
- Contained Unit
- t
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for antimony in the Pre-Strip Dump zone, reported within the antimony sub-domain, contributing to the strategic U.S. antimony resource from existing material.
Positive factors
- Maiden Indicated resource for strategic antimony within antimony sub-domain
- Higher grade antimony from already mined material
Evidence · table
“0.65%”
Context: 0.09
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · goldTonnes: 9100000Grade: 0.37Grade Unit: g/tContained Metal: 107500Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:f42f579dc5900dbd347a
- Deposit or zone
- Resurrection
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 9100000
- Grade
- 0.37
- Grade Unit
- g/t
- Contained Metal
- 107500
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for gold in the Resurrection zone, reported within the antimony sub-domain, representing a significant gold component of the MRE.
Positive factors
- Maiden Indicated resource for gold within antimony sub-domain
- Significant gold ounces
Evidence · table
“0.37”
Context: 9.1
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · silverTonnes: 9100000Grade: 0.97Grade Unit: g/tContained Metal: 283500Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:f42f579dc5900dbd347a
- Deposit or zone
- Resurrection
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 9100000
- Grade
- 0.97
- Grade Unit
- g/t
- Contained Metal
- 283500
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for silver in the Resurrection zone, reported within the antimony sub-domain, providing significant byproduct potential.
Positive factors
- Maiden Indicated resource for silver within antimony sub-domain
- Significant byproduct potential
Evidence · table
“0.97”
Context: 9.1
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · antimonyTonnes: 9100000Grade: 0.25Grade Unit: %Contained Metal: 22700Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:f42f579dc5900dbd347a
- Deposit or zone
- Resurrection
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 9100000
- Grade
- 0.25
- Grade Unit
- %
- Contained Metal
- 22700
- Contained Unit
- t
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Indicated resource for antimony in the Resurrection zone, reported within the antimony sub-domain, representing a significant antimony component of the MRE.
Positive factors
- Maiden Indicated resource for strategic antimony within antimony sub-domain
- Significant antimony tonnes
Evidence · table
“0.25%”
Context: 9.1
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · goldTonnes: 11300000Grade: 0.36Grade Unit: g/tContained Metal: 129500Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:393a1737a0c0da836fbc
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 11300000
- Grade
- 0.36
- Grade Unit
- g/t
- Contained Metal
- 129500
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden total Measured & Indicated resource for gold, reported within the antimony sub-domain, providing a substantial base of higher-confidence gold ounces.
Positive factors
- Maiden Measured & Indicated resource for gold within antimony sub-domain
- Significant gold ounces in higher confidence categories
Evidence · table
“0.36”
Context: 11.3
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · silverTonnes: 11300000Grade: 1.28Grade Unit: g/tContained Metal: 467600Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:393a1737a0c0da836fbc
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 11300000
- Grade
- 1.28
- Grade Unit
- g/t
- Contained Metal
- 467600
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden total Measured & Indicated resource for silver, reported within the antimony sub-domain, offering substantial byproduct potential.
Positive factors
- Maiden Measured & Indicated resource for silver within antimony sub-domain
- Significant byproduct potential in higher confidence categories
Evidence · table
“1.28”
Context: 11.3
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · antimonyTonnes: 11300000Grade: 0.26Grade Unit: %Contained Metal: 29600Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:393a1737a0c0da836fbc
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 11300000
- Grade
- 0.26
- Grade Unit
- %
- Contained Metal
- 29600
- Contained Unit
- t
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden total Measured & Indicated resource for antimony, reported within the antimony sub-domain, establishing a substantial strategic antimony base.
Positive factors
- Maiden Measured & Indicated resource for strategic antimony within antimony sub-domain
- Significant antimony tonnes in higher confidence categories
Evidence · table
“0.26%”
Context: 11.3
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · goldTonnes: 40000Grade: 0.28Grade Unit: g/tContained Metal: 400Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:306797daea922d5df451
- Deposit or zone
- Pre-Strip Dump
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 40000
- Grade
- 0.28
- Grade Unit
- g/t
- Contained Metal
- 400
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for gold in the Pre-Strip Dump zone, reported within the antimony sub-domain, contributing to the overall resource from existing material.
Positive factors
- Maiden Inferred resource for gold within antimony sub-domain
- From already mined material
Negative factors
- Lower confidence category
Evidence · table
“0.28”
Context: 0.04
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · silverTonnes: 40000Grade: 0.03Grade Unit: g/tContained Metal: 40Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:306797daea922d5df451
- Deposit or zone
- Pre-Strip Dump
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 40000
- Grade
- 0.03
- Grade Unit
- g/t
- Contained Metal
- 40
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for silver in the Pre-Strip Dump zone, reported within the antimony sub-domain, adding to the overall resource with low grade.
Positive factors
- Maiden Inferred resource for silver within antimony sub-domain
Negative factors
- Lower confidence category
- Very low grade
Evidence · table
“0.03”
Context: 0.04
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · antimonyTonnes: 40000Grade: 1.02Grade Unit: %Contained Metal: 500Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:306797daea922d5df451
- Deposit or zone
- Pre-Strip Dump
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 40000
- Grade
- 1.02
- Grade Unit
- %
- Contained Metal
- 500
- Contained Unit
- t
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for antimony in the Pre-Strip Dump zone, reported within the antimony sub-domain, contributing to the strategic U.S. antimony resource with high grade.
Positive factors
- Maiden Inferred resource for strategic antimony within antimony sub-domain
- High grade antimony from already mined material
Negative factors
- Lower confidence category
Evidence · table
“1.02%”
Context: 0.04
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · goldTonnes: 14100000Grade: 0.19Grade Unit: g/tContained Metal: 87300Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:6d0b9239e6f59555ed6e
- Deposit or zone
- Resurrection
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 14100000
- Grade
- 0.19
- Grade Unit
- g/t
- Contained Metal
- 87300
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for gold in the Resurrection zone, reported within the antimony sub-domain, adding significant gold ounces to the overall resource.
Positive factors
- Maiden Inferred resource for gold within antimony sub-domain
- Significant gold ounces
Negative factors
- Lower confidence category
Evidence · table
“0.19”
Context: 14.1
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · silverTonnes: 14100000Grade: 0.61Grade Unit: g/tContained Metal: 275700Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:6d0b9239e6f59555ed6e
- Deposit or zone
- Resurrection
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 14100000
- Grade
- 0.61
- Grade Unit
- g/t
- Contained Metal
- 275700
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for silver in the Resurrection zone, reported within the antimony sub-domain, providing significant byproduct potential.
Positive factors
- Maiden Inferred resource for silver within antimony sub-domain
- Significant byproduct potential
Negative factors
- Lower confidence category
Evidence · table
“0.61”
Context: 14.1
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · antimonyTonnes: 14100000Grade: 0.2Grade Unit: %Contained Metal: 27600Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:6d0b9239e6f59555ed6e
- Deposit or zone
- Resurrection
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 14100000
- Grade
- 0.2
- Grade Unit
- %
- Contained Metal
- 27600
- Contained Unit
- t
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for antimony in the Resurrection zone, reported within the antimony sub-domain, adding significant antimony tonnes to the strategic U.S. resource.
Positive factors
- Maiden Inferred resource for strategic antimony within antimony sub-domain
- Significant antimony tonnes
Negative factors
- Lower confidence category
Evidence · table
“0.20%”
Context: 14.1
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · goldTonnes: 12700000Grade: 0.26Grade Unit: g/tContained Metal: 108400Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:957b924033c46257ecff
- Deposit or zone
- Cadillac Valley
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 12700000
- Grade
- 0.26
- Grade Unit
- g/t
- Contained Metal
- 108400
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for gold in the Cadillac Valley zone, reported within the antimony sub-domain, adding significant gold ounces to the overall resource.
Positive factors
- Maiden Inferred resource for gold within antimony sub-domain
- Significant gold ounces
Negative factors
- Lower confidence category
Evidence · table
“0.26”
Context: 12.7
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · silverTonnes: 12700000Grade: 0.53Grade Unit: g/tContained Metal: 218100Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:957b924033c46257ecff
- Deposit or zone
- Cadillac Valley
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 12700000
- Grade
- 0.53
- Grade Unit
- g/t
- Contained Metal
- 218100
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for silver in the Cadillac Valley zone, reported within the antimony sub-domain, providing significant byproduct potential.
Positive factors
- Maiden Inferred resource for silver within antimony sub-domain
- Significant byproduct potential
Negative factors
- Lower confidence category
Evidence · table
“0.53”
Context: 12.7
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · antimonyTonnes: 12700000Grade: 0.16Grade Unit: %Contained Metal: 20000Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:957b924033c46257ecff
- Deposit or zone
- Cadillac Valley
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 12700000
- Grade
- 0.16
- Grade Unit
- %
- Contained Metal
- 20000
- Contained Unit
- t
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for antimony in the Cadillac Valley zone, reported within the antimony sub-domain, adding significant antimony tonnes to the strategic U.S. resource.
Positive factors
- Maiden Inferred resource for strategic antimony within antimony sub-domain
- Significant antimony tonnes
Negative factors
- Lower confidence category
Evidence · table
“0.16%”
Context: 12.7
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · goldTonnes: 26900000Grade: 0.23Grade Unit: g/tContained Metal: 196100Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:58cfcb33730376b92117
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 26900000
- Grade
- 0.23
- Grade Unit
- g/t
- Contained Metal
- 196100
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden total Inferred resource for gold, reported within the antimony sub-domain, representing a large gold endowment with significant future potential.
Positive factors
- Maiden Inferred resource for gold within antimony sub-domain
- Large gold ounces, indicating significant potential
Negative factors
- Lower confidence category
Evidence · table
“0.23”
Context: 26.9
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · silverTonnes: 26900000Grade: 0.57Grade Unit: g/tContained Metal: 493840Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:58cfcb33730376b92117
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 26900000
- Grade
- 0.57
- Grade Unit
- g/t
- Contained Metal
- 493840
- Contained Unit
- oz
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden total Inferred resource for silver, reported within the antimony sub-domain, indicating large byproduct potential for the project.
Positive factors
- Maiden Inferred resource for silver within antimony sub-domain
- Large byproduct potential
Negative factors
- Lower confidence category
Evidence · table
“0.57”
Context: 26.9
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · antimonyTonnes: 26900000Grade: 0.18Grade Unit: %Contained Metal: 48100Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:58cfcb33730376b92117
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 26900000
- Grade
- 0.18
- Grade Unit
- %
- Contained Metal
- 48100
- Contained Unit
- t
- Cutoff Grade
- 0.1
- Cutoff Unit
- % Sb
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden total Inferred resource for antimony, reported within the antimony sub-domain, representing a large strategic antimony endowment with significant future potential.
Positive factors
- Maiden Inferred resource for strategic antimony within antimony sub-domain
- Large antimony tonnes, indicating significant potential
Negative factors
- Lower confidence category
Evidence · table
“0.18%”
Context: 26.9
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · goldTonnes: 8900000Grade: 0.51Grade Unit: g/tContained Metal: 144200Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:348d67635810fe9c8f90
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 8900000
- Grade
- 0.51
- Grade Unit
- g/t
- Contained Metal
- 144200
- Contained Unit
- oz
- Cutoff Grade
- 0.6
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured & Indicated resource for gold at a higher cut-off grade, showing improved gold grade for a smaller tonnage.
Positive factors
- Maiden Measured & Indicated resource for gold at higher cut-off
- Higher gold grade
Evidence · table
“0.51”
Context: 8.9
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · silverTonnes: 8900000Grade: 1.41Grade Unit: g/tContained Metal: 400000Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:348d67635810fe9c8f90
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 8900000
- Grade
- 1.41
- Grade Unit
- g/t
- Contained Metal
- 400000
- Contained Unit
- oz
- Cutoff Grade
- 0.6
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured & Indicated resource for silver at a higher cut-off grade, showing improved silver grade for a smaller tonnage.
Positive factors
- Maiden Measured & Indicated resource for silver at higher cut-off
- Higher silver grade
Evidence · table
“1.41”
Context: 8.9
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · antimonyTonnes: 8900000Grade: 0.28Grade Unit: %Contained Metal: 25100Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:348d67635810fe9c8f90
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 8900000
- Grade
- 0.28
- Grade Unit
- %
- Contained Metal
- 25100
- Contained Unit
- t
- Cutoff Grade
- 0.6
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured & Indicated resource for antimony at a higher cut-off grade, showing improved antimony grade for a smaller tonnage.
Positive factors
- Maiden Measured & Indicated resource for strategic antimony at higher cut-off
- Higher antimony grade
Evidence · table
“0.28%”
Context: 8.9
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · goldTonnes: 51800000Grade: 0.41Grade Unit: g/tContained Metal: 690700Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:f0414df01b6e8ad01802
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 51800000
- Grade
- 0.41
- Grade Unit
- g/t
- Contained Metal
- 690700
- Contained Unit
- oz
- Cutoff Grade
- 0.6
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for gold at a higher cut-off grade, showing improved gold grade for a smaller tonnage.
Positive factors
- Maiden Inferred resource for gold at higher cut-off
- Higher gold grade
Negative factors
- Lower confidence category
Evidence · table
“0.41”
Context: 51.8
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · silverTonnes: 51800000Grade: 1.08Grade Unit: g/tContained Metal: 700220Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:f0414df01b6e8ad01802
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 51800000
- Grade
- 1.08
- Grade Unit
- g/t
- Contained Metal
- 700220
- Contained Unit
- oz
- Cutoff Grade
- 0.6
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for silver at a higher cut-off grade, showing improved silver grade for a smaller tonnage.
Positive factors
- Maiden Inferred resource for silver at higher cut-off
- Higher silver grade
Negative factors
- Lower confidence category
Evidence · table
“1.08”
Context: 51.8
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · antimonyTonnes: 51800000Grade: 0.14Grade Unit: %Contained Metal: 28600Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:f0414df01b6e8ad01802
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 51800000
- Grade
- 0.14
- Grade Unit
- %
- Contained Metal
- 28600
- Contained Unit
- t
- Cutoff Grade
- 0.6
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for antimony at a higher cut-off grade, showing improved antimony grade for a smaller tonnage.
Positive factors
- Maiden Inferred resource for strategic antimony at higher cut-off
- Higher antimony grade
Negative factors
- Lower confidence category
Evidence · table
“0.14%”
Context: 51.8
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · goldTonnes: 11300000Grade: 0.44Grade Unit: g/tContained Metal: 160600Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:393a1737a0c0da836fbc
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 11300000
- Grade
- 0.44
- Grade Unit
- g/t
- Contained Metal
- 160600
- Contained Unit
- oz
- Cutoff Grade
- 0.45
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured & Indicated resource for gold at an intermediate cut-off grade, showing good gold grade for a moderate tonnage.
Positive factors
- Maiden Measured & Indicated resource for gold at intermediate cut-off
- Good gold grade
Evidence · table
“0.44”
Context: 11.3
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · silverTonnes: 11300000Grade: 1.28Grade Unit: g/tContained Metal: 463100Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:393a1737a0c0da836fbc
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 11300000
- Grade
- 1.28
- Grade Unit
- g/t
- Contained Metal
- 463100
- Contained Unit
- oz
- Cutoff Grade
- 0.45
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured & Indicated resource for silver at an intermediate cut-off grade, showing good silver grade for a moderate tonnage.
Positive factors
- Maiden Measured & Indicated resource for silver at intermediate cut-off
- Good silver grade
Evidence · table
“1.28”
Context: 11.3
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · antimonyTonnes: 11300000Grade: 0.25Grade Unit: %Contained Metal: 28400Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:393a1737a0c0da836fbc
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 11300000
- Grade
- 0.25
- Grade Unit
- %
- Contained Metal
- 28400
- Contained Unit
- t
- Cutoff Grade
- 0.45
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured & Indicated resource for antimony at an intermediate cut-off grade, showing good antimony grade for a moderate tonnage.
Positive factors
- Maiden Measured & Indicated resource for strategic antimony at intermediate cut-off
- Good antimony grade
Evidence · table
“0.25%”
Context: 11.3
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · goldTonnes: 70300000Grade: 0.38Grade Unit: g/tContained Metal: 868000Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:35b42a2b922543fa8306
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 70300000
- Grade
- 0.38
- Grade Unit
- g/t
- Contained Metal
- 868000
- Contained Unit
- oz
- Cutoff Grade
- 0.45
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for gold at an intermediate cut-off grade, showing good gold grade for a large tonnage.
Positive factors
- Maiden Inferred resource for gold at intermediate cut-off
- Good gold grade
Negative factors
- Lower confidence category
Evidence · table
“0.38”
Context: 70.3
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · silverTonnes: 70300000Grade: 0.83Grade Unit: g/tContained Metal: 1036340Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:35b42a2b922543fa8306
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 70300000
- Grade
- 0.83
- Grade Unit
- g/t
- Contained Metal
- 1036340
- Contained Unit
- oz
- Cutoff Grade
- 0.45
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for silver at an intermediate cut-off grade, showing good silver grade for a large tonnage.
Positive factors
- Maiden Inferred resource for silver at intermediate cut-off
- Good silver grade
Negative factors
- Lower confidence category
Evidence · table
“0.83”
Context: 70.3
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · antimonyTonnes: 70300000Grade: 0.12Grade Unit: %Contained Metal: 46000Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:35b42a2b922543fa8306
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 70300000
- Grade
- 0.12
- Grade Unit
- %
- Contained Metal
- 46000
- Contained Unit
- t
- Cutoff Grade
- 0.45
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for antimony at an intermediate cut-off grade, showing good antimony grade for a large tonnage.
Positive factors
- Maiden Inferred resource for strategic antimony at intermediate cut-off
- Good antimony grade
Negative factors
- Lower confidence category
Evidence · table
“0.12%”
Context: 70.3
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · goldTonnes: 23100000Grade: 0.28Grade Unit: g/tContained Metal: 204900Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:6f44f7dfbc37ec4b34e1
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 23100000
- Grade
- 0.28
- Grade Unit
- g/t
- Contained Metal
- 204900
- Contained Unit
- oz
- Cutoff Grade
- 0.15
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured & Indicated resource for gold at a lower cut-off grade, showing increased tonnage with a lower gold grade.
Positive factors
- Maiden Measured & Indicated resource for gold at lower cut-off
- Increased tonnage
Evidence · table
“0.28”
Context: 23.1
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · silverTonnes: 23100000Grade: 0.98Grade Unit: g/tContained Metal: 729300Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:6f44f7dfbc37ec4b34e1
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 23100000
- Grade
- 0.98
- Grade Unit
- g/t
- Contained Metal
- 729300
- Contained Unit
- oz
- Cutoff Grade
- 0.15
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured & Indicated resource for silver at a lower cut-off grade, showing increased tonnage with a lower silver grade.
Positive factors
- Maiden Measured & Indicated resource for silver at lower cut-off
- Increased tonnage
Evidence · table
“0.98”
Context: 23.1
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
indicatedLimo Butte · antimonyTonnes: 23100000Grade: 0.16Grade Unit: %Contained Metal: 36100Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:6f44f7dfbc37ec4b34e1
- Mining method
- open_pit
Resource Data
- Category
- indicated
- Tonnes
- 23100000
- Grade
- 0.16
- Grade Unit
- %
- Contained Metal
- 36100
- Contained Unit
- t
- Cutoff Grade
- 0.15
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Measured & Indicated resource for antimony at a lower cut-off grade, showing increased tonnage with a lower antimony grade.
Positive factors
- Maiden Measured & Indicated resource for strategic antimony at lower cut-off
- Increased tonnage
Evidence · table
“0.16%”
Context: 23.1
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · goldTonnes: 221900000Grade: 0.23Grade Unit: g/tContained Metal: 1628900Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:8e0fcaf4186f8685686f
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 221900000
- Grade
- 0.23
- Grade Unit
- g/t
- Contained Metal
- 1628900
- Contained Unit
- oz
- Cutoff Grade
- 0.15
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for gold at a lower cut-off grade, showing significantly increased tonnage and contained ounces, albeit with a lower grade.
Positive factors
- Maiden Inferred resource for gold at lower cut-off
- Significantly increased tonnage and contained ounces
Negative factors
- Lower confidence category
Evidence · table
“0.23”
Context: 221.9
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · silverTonnes: 221900000Grade: 0.49Grade Unit: g/tContained Metal: 2997940Contained Unit: ozView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- silver
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:8e0fcaf4186f8685686f
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 221900000
- Grade
- 0.49
- Grade Unit
- g/t
- Contained Metal
- 2997940
- Contained Unit
- oz
- Cutoff Grade
- 0.15
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for silver at a lower cut-off grade, showing significantly increased tonnage and contained ounces, albeit with a lower grade.
Positive factors
- Maiden Inferred resource for silver at lower cut-off
- Significantly increased tonnage and contained ounces
Negative factors
- Lower confidence category
Evidence · table
“0.49”
Context: 221.9
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
inferredLimo Butte · antimonyTonnes: 221900000Grade: 0.06Grade Unit: %Contained Metal: 114000Contained Unit: tView all detailsHide details
Identity
- Project
- Limo Butte
- Commodity
- antimony
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- NAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- QP Signed
- Yes
- Qualified person names
- Greg Mosher
- Resource group id
- resource:8e0fcaf4186f8685686f
- Mining method
- open_pit
Resource Data
- Category
- inferred
- Tonnes
- 221900000
- Grade
- 0.06
- Grade Unit
- %
- Contained Metal
- 114000
- Contained Unit
- t
- Cutoff Grade
- 0.15
- Cutoff Unit
- g/t AuEq.
Prior Estimate
- Resource Date
- 2026-07-15
Metal Equivalent
- Assumptions Disclosed
- Yes
Lab
- Laboratory
- American Assay Labs, Reno
Location
- Loc. Confidence
- medium
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-15T00:00:00.000Z
Reasoning: Maiden Inferred resource for antimony at a lower cut-off grade, showing significantly increased tonnage and contained tonnes, albeit with a lower grade.
Positive factors
- Maiden Inferred resource for strategic antimony at lower cut-off
- Significantly increased tonnage and contained tonnes
Negative factors
- Lower confidence category
Evidence · table
“0.06%”
Context: 221.9
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
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: the release names the study this estimate supports
PFS-Supportingneutral
Resource estimate prepared to support a Pre-Feasibility Study — requires adequate M&I component.
Why it applies: the release names the study this estimate supports
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.