i-80 Gold Announces Positive Feasibility Study and Initial Mineral Reserves for Granite Creek Underground; After-Tax NPV(5%) of $118 Million at $2,750/oz Au Increasing to $598 Million at $4,500/oz Au
Original announcement by orestocks on
- Company
- i-80 Gold Corp.
- Ticker
- IAU
- Exchange
- Unavailable
- Region
- Nevada, USA
- Primary commodity
- Gold
- Secondary commodities
- None reported
- Document categories
- Resource update, Production, Metallurgy
- Extracted
- 2026-09-21 23:41:57 UTC
Analysis by Minestarters Atlas
Atlas analysis published:
Minestarters Atlas analysis
Summary
i-80 Gold announced a positive Feasibility Study for its Granite Creek Underground gold project in northern Nevada, establishing initial Proven and Probable Mineral Reserves of 2.20 Mt grading 7.87 g/t Au containing 556,500 oz Au. Measured and Indicated Mineral Resources increased by 229% to 3.73 Mt grading 7.17 g/t Au containing 859,500 oz Au. The study projects an after-tax NPV(5%) of $118 million at a base case gold price of $2,750/oz, with an 8.5-year mine life and average annual gold production of 75,000 oz from 2028-2032, supported by an optimized processing strategy at the company's Lone Tree plant.
Reasoning: The Feasibility Study for Granite Creek Underground outlines robust economics, establishes initial Proven and Probable Mineral Reserves, and significantly increases Measured and Indicated Mineral Resources, demonstrating strong project advancement and future production potential, despite the refractory nature of the ore.
Positive factors
- Initial Proven and Probable Mineral Reserves established, providing a robust foundation for future production.
- Significant increase (229%) in Measured and Indicated Mineral Resources, indicating improved geological confidence and potential for further conversion.
- Conversion of Inferred resources to higher confidence categories (Measured and Indicated) demonstrates successful infill drilling.
- Positive project economics outlined in the Feasibility Study, with a substantial after-tax NPV at base case gold prices.
- Optimized processing strategy utilizing the company's own Lone Tree plant is expected to reduce future operating costs.
- Project is fully permitted and already ramping up production, indicating advanced stage of development.
- Ongoing exploration programs suggest potential for further resource growth and mine life extension.
Negative factors
- Historical drill results for the CX Zone, mentioned as a prospective target, lack QA/QC data, reducing confidence in those specific intercepts.
- The ore is predominantly refractory, requiring an oxidation process (POX), which can be capital and energy intensive.
- All-in sustaining costs are relatively high at $1,915/oz Au for the steady-state period, which could impact profitability at lower gold prices.
Low confidence — this extraction should be reviewed alongside the original source.
Facts used in scoring: 26
Classification and evidence
Proven Reservepositive
Measured Resource with demonstrated economic viability after applying modifying factors.
Why it applies: The document announces 'Initial Proven and Probable Mineral Reserves of 2.20 million tonnes... containing 556,500 ounces... of gold'.
Evidence · text
“Initial Proven and Probable Mineral Reserves of 2.20 million tonnes ("Mt") grading 7.87 grams per tonne ("g/t") gold ("Au") containing 556,500 ounces ("oz") of gold ("Au").”
Probable Reservepositive
Indicated Resource with demonstrated economic viability after applying modifying factors.
Why it applies: The document announces 'Initial Proven and Probable Mineral Reserves of 2.20 million tonnes... containing 556,500 ounces... of gold'.
Evidence · text
“Initial Proven and Probable Mineral Reserves of 2.20 million tonnes ("Mt") grading 7.87 grams per tonne ("g/t") gold ("Au") containing 556,500 ounces ("oz") of gold ("Au").”
Measured Resourcepositive
Highest confidence category — tonnage, grade, shape well-established from closely-spaced drilling. Basis for Proven Reserves.
Why it applies: The document states 'Measured and Indicated underground Mineral Resources increased by 229% to 3.73 Mt grading 7.17 g/t Au containing 859,500 oz Au'.
Evidence · text
“Measured and Indicated underground Mineral Resources increased by 229% to 3.73 Mt grading 7.17 g/t Au containing 859,500 oz Au”
Indicated Resourcepositive
Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves.
Why it applies: The document states 'Measured and Indicated underground Mineral Resources increased by 229% to 3.73 Mt grading 7.17 g/t Au containing 859,500 oz Au'.
Evidence · text
“Measured and Indicated underground Mineral Resources increased by 229% to 3.73 Mt grading 7.17 g/t Au containing 859,500 oz Au”
Category Upgradepositive
Resource confidence improved — Inferred upgraded to Indicated, or Indicated to Measured. De-risking signal.
Why it applies: Measured and Indicated underground Mineral Resources increased by 229% while Inferred Mineral Resources decreased by 38% as the infill program converted a portion of Inferred Mineral Resources into higher classification categories.
Evidence · text
“Measured and Indicated underground Mineral Resources increased by 229% to 3.73 Mt grading 7.17 g/t Au containing 859,500 oz Au, compared to the PEA(1); Inferred Mineral Resources decreased by 38% to 0.89 Mt grading 7.06 g/t Au containing 202,800 oz Au as the infill program converted a portion of Inferred Mineral Resources into the higher classification categories.”
Contained Metal Growthpositive
True scale improvement — contained metal ounces/tonnes increased vs prior, accounting for both tonnage and grade changes.
Why it applies: The document states that 'approximately 65,000 ounces have been added to mineral inventory' after accounting for mining depletion.
Evidence · text
“approximately 65,000 ounces have been added to mineral inventory”
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: The technical information has been reviewed and approved by Benjamin Parsons (MAusIMM CP) for Mineral Resources and Anton Chan (P.Eng., MMSAQP) for Mineral Reserves, both Qualified Persons.
Evidence · text
“prepared under the supervision of, and has been reviewed and approved by Benjamin Parsons, BSc, MSc Geology, MAusIMM (CP#222568) for Mineral Resources and Anton Chan, B.Eng (Mining), MS (Earth Science), P.Eng., MMSAQP (#01546QP) for Mineral Reserves, both of SRK Consulting (U.S.), Inc., and reviewed by Paul Chawrun P.Eng., EVP & COO, for the Company, who are all qualified persons within the meaning of NI 43-101 and S-K 1300.”
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: The technical report was prepared under National Instrument 43-101 – Standards of Disclosure for Mineral Projects ('NI 43-101').
Evidence · text
“a technical report prepared under National Instrument 43-101 – Standards of Disclosure for Mineral Projects ("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 explicitly states the cutoff grades used for both mineral reserves and resources.
Evidence · text
“Mineral Reserves are reported using a stopecenter of gravity ("CoG") range of 4.42 g/t (0.13 oz/st) Au – 6.41 g/t (0.19 oz/st) Au and an incremental processing CoGrange of 1.51 g/t (0.04 oz/st) Au – 2.91 g/t (0.09 oz/st) Au depending on the processing method.”
DFS-Supportingneutral
Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence.
Why it applies: The document is a Feasibility Study, which is the highest level of technical study to support project development.
Evidence · text
“i-80 Gold Announces Positive Feasibility Study and Initial Mineral Reserves for Granite Creek Underground”
Resource Updateneutral
Revised estimate for an existing resource — compare to prior to assess progress.
Why it applies: The document presents an 'updated underground mineral resource estimate' compared to a previous PEA.
Evidence · text
“The updated underground mineral resource estimate included in the FS incorporates approximately 36,470 meters of drilling from 164 core holes conducted between 2023 through the end of 2025, relative to the resource estimate that formed the basis of the PEA published in March 2025.”
Maiden Resourceneutral
First formal MRE for the project — establishes baseline but typically exploration-stage with high Inferred component.
Why it applies: The document announces 'Initial Mineral Reserves' for the project.
Evidence · text
“Initial Proven and Probable Mineral Reserves of 2.20 million tonnes ("Mt") grading 7.87 grams per tonne ("g/t") gold ("Au") containing 556,500 ounces ("oz") of gold ("Au").”
Refractory Orenegative
Ore requires oxidation/pressure treatment before recovery — a processing and recovery risk.
Why it applies: Metallurgical testing demonstrated that the ore contains 'predominantly single refractory material and require an oxidation process to increase gold extraction'.
Evidence · text
“Metallurgical testing has demonstrated that the Ogee, Otto and South Pacific zones at Granite Creek Underground contain predominantly single refractory material and require an oxidation process to increase gold extraction using cyanidation.”
No QA/QC Disclosurenegative · Story-specific tag
Release does not disclose QA/QC — lab certification, CP/QP sign-off and assay protocols cannot be checked from this document.
Why it applies: Historical drill results for the CX Zone are mentioned to lack QA/QC data.
Evidence · text
“No QA/QC data is available for these results, however these holes were found to be acceptable for use in the 2026 Granite Creek open pit resource estimate as conducted by Global Resource Engineering (GRE).”
Stale Data Re-releasenegative · Story-specific tag
Historical results re-announced with no new assays or reinterpretation — low genuine novelty.
Why it applies: The document references 'Previous drilling in the CX Zone includes high-grade intercepts from legacy holes' from 1997 and 1995, which are historical results.
Evidence · text
“Previous drilling in the CX Zone includes high-grade intercepts from legacy holes, including 18.0 g/t Au over 9.1 m in hole HPR 078 and 15.3 g/t Au over 9.1 m in RHC-1763, and i-80 hole of 36.4 g/t Au over 9.1 m in iGM21-06.(9)”
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: The processing strategy involves the company's wholly owned Lone Tree autoclave and carbon-in-leach (CIL) plant.
Evidence · text
“Lone Tree autoclave and carbon-in-leach plant”
POX/BIOX Routeneutral
Pressure or bio-oxidation for refractory ore — high CAPEX and OPEX.
Why it applies: The processing strategy for refractory material involves 'acid pressure oxidation ("POX") conditions'.
Evidence · text
“acid pressure oxidation ("POX") conditions”
Gravity Routeneutral
Gravity separation forms a material part of the flowsheet.
Why it applies: the document describes a gravity route ("gravity")
Extracted facts
Stored fact records: 26. Some facts used in scoring do not have a stored record.
Resource Estimates (25)
provenGranite Creek Underground · goldTonnes: 71000Grade: 9.34Grade Unit: g/tContained Metal: 21.2Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Anton Chan, Benjamin Parsons
- Resource group id
- resource:ded839cd2c23871ebe9c
- Deposit or zone
- Ogee
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- proven
- Tonnes
- 71000
- Grade
- 9.34
- Grade Unit
- g/t
- Contained Metal
- 21.2
- Contained Unit
- koz
- Cutoff Grade
- 4.42
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: High-grade Proven reserve for the Ogee zone, contributing to the initial mineral reserves for the project, with a cutoff grade of 4.42 g/t Au.
Positive factors
- High grade for an underground gold reserve.
- Proven category indicates high confidence in the estimate.
- Part of initial mineral reserves for the project.
Evidence · table
“9.34”
Context: 71
Tags used in scoring
Proven Reservepositive
Measured Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "proven"
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
provenGranite Creek Underground · goldTonnes: 171000Grade: 7.04Grade Unit: g/tContained Metal: 38.7Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Anton Chan, Benjamin Parsons
- Resource group id
- resource:086c2ec83da971e0eda1
- Deposit or zone
- Otto
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- proven
- Tonnes
- 171000
- Grade
- 7.04
- Grade Unit
- g/t
- Contained Metal
- 38.7
- Contained Unit
- koz
- Cutoff Grade
- 4.42
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Strong-grade Proven reserve for the Otto zone, contributing to the initial mineral reserves for the project, with a cutoff grade of 4.42 g/t Au.
Positive factors
- Strong grade for an underground gold reserve.
- Proven category indicates high confidence in the estimate.
- Part of initial mineral reserves for the project.
Evidence · table
“7.04”
Context: 171
Tags used in scoring
Proven Reservepositive
Measured Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "proven"
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
provenGranite Creek Underground · goldTonnes: 40000Grade: 11.21Grade Unit: g/tContained Metal: 14.5Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Anton Chan, Benjamin Parsons
- Resource group id
- resource:ab2b059c9a84c0c9e55a
- Deposit or zone
- South Pacific
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- proven
- Tonnes
- 40000
- Grade
- 11.21
- Grade Unit
- g/t
- Contained Metal
- 14.5
- Contained Unit
- koz
- Cutoff Grade
- 4.42
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Exceptional-grade Proven reserve for the South Pacific zone, contributing to the initial mineral reserves for the project, with a cutoff grade of 4.42 g/t Au.
Positive factors
- Exceptional grade for an underground gold reserve.
- Proven category indicates high confidence in the estimate.
- Part of initial mineral reserves for the project.
Evidence · table
“11.21”
Context: 40
Tags used in scoring
Proven Reservepositive
Measured Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "proven"
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
provenGranite Creek Underground · goldTonnes: 26000Grade: 7.33Grade Unit: g/tContained Metal: 6.2Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Anton Chan, Benjamin Parsons
- Resource group id
- resource:78429c4a9a11ed89e98d
- Deposit or zone
- Stockpile
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- proven
- Tonnes
- 26000
- Grade
- 7.33
- Grade Unit
- g/t
- Contained Metal
- 6.2
- Contained Unit
- koz
- Cutoff Grade
- 4.42
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Strong-grade Proven reserve from stockpile, contributing to the initial mineral reserves for the project, with a cutoff grade of 4.42 g/t Au.
Positive factors
- Strong grade for a gold reserve.
- Proven category indicates high confidence in the estimate.
- Represents already mined material, reducing future mining risk.
Evidence · table
“7.33”
Context: 26
Tags used in scoring
Proven Reservepositive
Measured Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "proven"
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
probableGranite Creek Underground · goldTonnes: 88000Grade: 7.95Grade Unit: g/tContained Metal: 22.4Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Anton Chan, Benjamin Parsons
- Resource group id
- resource:e90567a8a1c40ff64270
- Deposit or zone
- Ogee
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- probable
- Tonnes
- 88000
- Grade
- 7.95
- Grade Unit
- g/t
- Contained Metal
- 22.4
- Contained Unit
- koz
- Cutoff Grade
- 4.42
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Strong-grade Probable reserve for the Ogee zone, contributing to the initial mineral reserves for the project, with a cutoff grade of 4.42 g/t Au.
Positive factors
- Strong grade for an underground gold reserve.
- Probable category indicates good confidence in the estimate.
- Part of initial mineral reserves for the project.
Evidence · table
“7.95”
Context: 88
Tags used in scoring
Probable Reservepositive
Indicated Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "probable"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
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
probableGranite Creek Underground · goldTonnes: 366000Grade: 6.7Grade Unit: g/tContained Metal: 78.8Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Anton Chan, Benjamin Parsons
- Resource group id
- resource:a5da6a7100671010bcaf
- Deposit or zone
- Otto
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- probable
- Tonnes
- 366000
- Grade
- 6.7
- Grade Unit
- g/t
- Contained Metal
- 78.8
- Contained Unit
- koz
- Cutoff Grade
- 4.42
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Strong-grade Probable reserve for the Otto zone, contributing to the initial mineral reserves for the project, with a cutoff grade of 4.42 g/t Au.
Positive factors
- Strong grade for an underground gold reserve.
- Probable category indicates good confidence in the estimate.
- Part of initial mineral reserves for the project.
Evidence · table
“6.70”
Context: 366
Tags used in scoring
Probable Reservepositive
Indicated Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "probable"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
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
probableGranite Creek Underground · goldTonnes: 1437000Grade: 8.11Grade Unit: g/tContained Metal: 374.7Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Anton Chan, Benjamin Parsons
- Resource group id
- resource:bbd4ce7157d188ea5fd0
- Deposit or zone
- South Pacific
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- probable
- Tonnes
- 1437000
- Grade
- 8.11
- Grade Unit
- g/t
- Contained Metal
- 374.7
- Contained Unit
- koz
- Cutoff Grade
- 4.42
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: High-grade Probable reserve for the South Pacific zone, representing the largest portion of initial mineral reserves, with a cutoff grade of 4.42 g/t Au.
Positive factors
- High grade for an underground gold reserve.
- Probable category indicates good confidence in the estimate.
- Largest component of initial mineral reserves for the project.
Evidence · table
“8.11”
Context: 1,437
Tags used in scoring
Probable Reservepositive
Indicated Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "probable"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
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
provenGranite Creek Underground · goldTonnes: 308000Grade: 8.13Grade Unit: g/tContained Metal: 80.6Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Anton Chan, Benjamin Parsons
- Resource group id
- resource:44f94abfc9c1338e30f4
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- proven
- Tonnes
- 308000
- Grade
- 8.13
- Grade Unit
- g/t
- Contained Metal
- 80.6
- Contained Unit
- koz
- Cutoff Grade
- 4.42
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Total Proven reserves for the Granite Creek Underground project, with a high average grade of 8.13 g/t Au and a cutoff grade of 4.42 g/t Au.
Positive factors
- High grade for an underground gold reserve.
- Proven category indicates high confidence in the estimate.
- Represents the total Proven reserves for the project.
Evidence · table
“8.13”
Context: 308
Tags used in scoring
Proven Reservepositive
Measured Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "proven"
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
probableGranite Creek Underground · goldTonnes: 1890000Grade: 7.83Grade Unit: g/tContained Metal: 475.9Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Anton Chan, Benjamin Parsons
- Resource group id
- resource:9487a1f013e1849da06f
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- probable
- Tonnes
- 1890000
- Grade
- 7.83
- Grade Unit
- g/t
- Contained Metal
- 475.9
- Contained Unit
- koz
- Cutoff Grade
- 4.42
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Total Probable reserves for the Granite Creek Underground project, with a high average grade of 7.83 g/t Au and a cutoff grade of 4.42 g/t Au.
Positive factors
- High grade for an underground gold reserve.
- Probable category indicates good confidence in the estimate.
- Represents the total Probable reserves for the project.
Evidence · table
“7.83”
Context: 1,890
Tags used in scoring
Probable Reservepositive
Indicated Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "probable"
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: cutoff_grade is stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
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
provenGranite Creek Underground · goldTonnes: 2198000Grade: 7.87Grade Unit: g/tContained Metal: 556.5Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Anton Chan, Benjamin Parsons
- Resource group id
- resource:9ccb7d3c3aa70b62c67d
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- proven
- Tonnes
- 2198000
- Grade
- 7.87
- Grade Unit
- g/t
- Contained Metal
- 556.5
- Contained Unit
- koz
- Cutoff Grade
- 4.42
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Total Proven and Probable Mineral Reserves for the Granite Creek Underground project, representing a significant and high-grade initial reserve base, with a cutoff grade of 4.42 g/t Au.
Positive factors
- Initial Proven and Probable Mineral Reserves established, providing a robust foundation for future production.
- High grade for an underground gold reserve.
- Significant contained metal for the project.
Evidence · table
“7.87”
Context: 2,198
Tags used in scoring
Proven Reservepositive
Measured Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "proven"
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
measuredGranite Creek Underground · goldTonnes: 231000Grade: 7.88Grade Unit: g/tContained Metal: 58.5Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:cdd259eb3cfdaf5e94e2
- Deposit or zone
- Ogee
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- measured
- Tonnes
- 231000
- Grade
- 7.88
- Grade Unit
- g/t
- Contained Metal
- 58.5
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: High-grade Measured resource for the Ogee zone, contributing to the substantial increase in Measured and Indicated resources, with a cutoff grade of 3.75 g/t Au.
Positive factors
- High grade for an underground gold resource.
- Measured category indicates high confidence in the estimate.
- Contributes to the significant increase in M&I resources.
Evidence · table
“7.88”
Context: 231
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
measuredGranite Creek Underground · goldTonnes: 310000Grade: 6.69Grade Unit: g/tContained Metal: 66.6Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:a6ed1451ceaf805e50f2
- Deposit or zone
- Otto
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- measured
- Tonnes
- 310000
- Grade
- 6.69
- Grade Unit
- g/t
- Contained Metal
- 66.6
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Strong-grade Measured resource for the Otto zone, contributing to the substantial increase in Measured and Indicated resources, with a cutoff grade of 3.75 g/t Au.
Positive factors
- Strong grade for an underground gold resource.
- Measured category indicates high confidence in the estimate.
- Contributes to the significant increase in M&I resources.
Evidence · table
“6.69”
Context: 310
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
measuredGranite Creek Underground · goldTonnes: 65000Grade: 9.85Grade Unit: g/tContained Metal: 20.7Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:7bc5afebbe197a00f6e8
- Deposit or zone
- South Pacific
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- measured
- Tonnes
- 65000
- Grade
- 9.85
- Grade Unit
- g/t
- Contained Metal
- 20.7
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Exceptional-grade Measured resource for the South Pacific zone, contributing to the substantial increase in Measured and Indicated resources, with a cutoff grade of 3.75 g/t Au.
Positive factors
- Exceptional grade for an underground gold resource.
- Measured category indicates high confidence in the estimate.
- Contributes to the significant increase in M&I resources.
Evidence · table
“9.85”
Context: 65
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
indicatedGranite Creek Underground · goldTonnes: 321000Grade: 7.06Grade Unit: g/tContained Metal: 72.9Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:920bb341e6b64c4c8ef3
- Deposit or zone
- Ogee
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- indicated
- Tonnes
- 321000
- Grade
- 7.06
- Grade Unit
- g/t
- Contained Metal
- 72.9
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Strong-grade Indicated resource for the Ogee zone, contributing to the substantial increase in Measured and Indicated resources, with a cutoff grade of 3.75 g/t Au.
Positive factors
- Strong grade for an underground gold resource.
- Indicated category indicates good confidence in the estimate.
- Contributes to the significant increase in M&I resources.
Evidence · table
“7.06”
Context: 322
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
indicatedGranite Creek Underground · goldTonnes: 746000Grade: 6.26Grade Unit: g/tContained Metal: 150.2Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:7f708c15d9c6af0fc741
- Deposit or zone
- Otto
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- indicated
- Tonnes
- 746000
- Grade
- 6.26
- Grade Unit
- g/t
- Contained Metal
- 150.2
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Strong-grade Indicated resource for the Otto zone, contributing to the substantial increase in Measured and Indicated resources, with a cutoff grade of 3.75 g/t Au.
Positive factors
- Strong grade for an underground gold resource.
- Indicated category indicates good confidence in the estimate.
- Contributes to the significant increase in M&I resources.
Evidence · table
“6.26”
Context: 746
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
indicatedGranite Creek Underground · goldTonnes: 2055000Grade: 7.42Grade Unit: g/tContained Metal: 490.4Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:ca1ffce1b404ca51dd31
- Deposit or zone
- South Pacific
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- indicated
- Tonnes
- 2055000
- Grade
- 7.42
- Grade Unit
- g/t
- Contained Metal
- 490.4
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: High-grade Indicated resource for the South Pacific zone, representing the largest portion of the increased Measured and Indicated resources, with a cutoff grade of 3.75 g/t Au.
Positive factors
- High grade for an underground gold resource.
- Indicated category indicates good confidence in the estimate.
- Largest component of the significant increase in M&I resources.
Evidence · table
“7.42”
Context: 2,055
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
measuredGranite Creek Underground · goldTonnes: 606000Grade: 7.49Grade Unit: g/tContained Metal: 145.8Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:a3ff3d5f3f6523e8bd0d
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- measured
- Tonnes
- 606000
- Grade
- 7.49
- Grade Unit
- g/t
- Contained Metal
- 145.8
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Total Measured resources for the Granite Creek Underground project, with a high average grade of 7.49 g/t Au and a cutoff grade of 3.75 g/t Au.
Positive factors
- High grade for an underground gold resource.
- Measured category indicates high confidence in the estimate.
- Represents the total Measured resources for the project.
Evidence · table
“7.49”
Context: 606
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
indicatedGranite Creek Underground · goldTonnes: 3122000Grade: 7.11Grade Unit: g/tContained Metal: 713.5Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:a2ee534985d2ec884cd5
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- indicated
- Tonnes
- 3122000
- Grade
- 7.11
- Grade Unit
- g/t
- Contained Metal
- 713.5
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Total Indicated resources for the Granite Creek Underground project, with a high average grade of 7.11 g/t Au and a cutoff grade of 3.75 g/t Au.
Positive factors
- High grade for an underground gold resource.
- Indicated category indicates good confidence in the estimate.
- Represents the total Indicated resources for the project.
Evidence · table
“7.11”
Context: 3,122
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
indicatedGranite Creek Underground · goldTonnes: 3728000Grade: 7.17Grade Unit: g/tContained Metal: 859.3Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:0cd3b8e94fccb2c23af6
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- indicated
- Tonnes
- 3728000
- Grade
- 7.17
- Grade Unit
- g/t
- Contained Metal
- 859.3
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Total Measured and Indicated resources for the Granite Creek Underground project, showing a substantial increase and high average grade, with a cutoff grade of 3.75 g/t Au.
Positive factors
- Significant increase (229%) in Measured and Indicated Mineral Resources, indicating improved geological confidence and potential for further conversion.
- High grade for an underground gold resource.
- Represents the total Measured and Indicated resources for the project.
Evidence · table
“7.17”
Context: 3,729
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
inferredGranite Creek Underground · goldTonnes: 38000Grade: 6.7Grade Unit: g/tContained Metal: 8.3Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:ae2c6cfa5939bd50327d
- Deposit or zone
- Ogee
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- inferred
- Tonnes
- 38000
- Grade
- 6.7
- Grade Unit
- g/t
- Contained Metal
- 8.3
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Strong-grade Inferred resource for the Ogee zone, representing a smaller component of the overall resource, with a cutoff grade of 3.75 g/t Au.
Positive factors
- Strong grade for an underground gold resource.
Negative factors
- Inferred category indicates lower geological confidence.
Evidence · table
“6.70”
Context: 39
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
inferredGranite Creek Underground · goldTonnes: 425000Grade: 7.63Grade Unit: g/tContained Metal: 104.4Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:85498eecac69d1b0eb8d
- Deposit or zone
- Otto
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- inferred
- Tonnes
- 425000
- Grade
- 7.63
- Grade Unit
- g/t
- Contained Metal
- 104.4
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: High-grade Inferred resource for the Otto zone, contributing to the overall resource base, with a cutoff grade of 3.75 g/t Au.
Positive factors
- High grade for an underground gold resource.
Negative factors
- Inferred category indicates lower geological confidence.
Evidence · table
“7.63”
Context: 425
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
inferredGranite Creek Underground · goldTonnes: 418000Grade: 6.53Grade Unit: g/tContained Metal: 87.4Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:2db84ccc787e5a7f3a9b
- Deposit or zone
- South Pacific
- Ownership percent
- 91.67 %
- Resource basis
- attributable
Resource Data
- Category
- inferred
- Tonnes
- 418000
- Grade
- 6.53
- Grade Unit
- g/t
- Contained Metal
- 87.4
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Strong-grade Inferred resource for the South Pacific zone, with a lower attributable ownership of 91.67% and a cutoff grade of 3.75 g/t Au.
Positive factors
- Strong grade for an underground gold resource.
Negative factors
- Inferred category indicates lower geological confidence.
- Lower attributable ownership percentage for this portion of the resource.
Evidence · table
“6.53”
Context: 429
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
inferredGranite Creek Underground · goldTonnes: 882000Grade: 7.06Grade Unit: g/tContained Metal: 200.1Contained Unit: kozView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:1619f41f9806733fbeb3
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- inferred
- Tonnes
- 882000
- Grade
- 7.06
- Grade Unit
- g/t
- Contained Metal
- 200.1
- Contained Unit
- koz
- Cutoff Grade
- 3.75
- Cutoff Unit
- g/t
Prior Estimate
- Resource Date
- 2026-03-31
Metal Equivalent
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Total Inferred resources for the Granite Creek Underground project, with a strong average grade of 7.06 g/t Au, but representing a lower confidence category and a decrease from prior estimates due to conversion, with a cutoff grade of 3.75 g/t Au.
Positive factors
- Strong grade for an underground gold resource.
Negative factors
- Inferred category indicates lower geological confidence.
- Overall Inferred resources decreased by 38% as material was converted to higher categories.
Evidence · table
“7.06”
Context: 893
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
indicatedGranite Creek open pit · goldGrade: 0.97Grade Unit: g/tContained Metal: 1591000Contained Unit: ozView all detailsHide details
Identity
- Project
- Granite Creek open pit
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:533cc28490cd02b033cc
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- indicated
- Grade
- 0.97
- Grade Unit
- g/t
- Contained Metal
- 1591000
- Contained Unit
- oz
Prior Estimate
- Resource Date
- 2026-03-31
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Updated Measured and Indicated open pit resource for Granite Creek, showing a significant contained gold amount and an 11% increase from prior estimates.
Positive factors
- Significant contained gold ounces for an open pit resource.
- Measured and Indicated categories indicate good confidence.
- Open pit M&I resources increased by 11%.
Negative factors
- Lower grade typical for open pit, but still below strong threshold for porphyry.
Evidence · text
“1,591,000 oz Au grading 0.97 g/t Au in the Measured and Indicated categories”
Tags used in scoring
Indicated Resourcepositive
Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves.
Why it applies: category is "indicated"
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
inferredGranite Creek open pit · goldGrade: 0.81Grade Unit: g/tContained Metal: 99800Contained Unit: ozView all detailsHide details
Identity
- Project
- Granite Creek open pit
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101, sec_sk1300
- QP Signed
- Yes
- Qualified person names
- Benjamin Parsons, Anton Chan
- Resource group id
- resource:b4774a31762f83480591
- Ownership percent
- 100 %
- Resource basis
- attributable
Resource Data
- Category
- inferred
- Grade
- 0.81
- Grade Unit
- g/t
- Contained Metal
- 99800
- Contained Unit
- oz
Prior Estimate
- Resource Date
- 2026-03-31
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Updated Inferred open pit resource for Granite Creek, showing an increase from prior estimates but remaining in a lower confidence category.
Positive factors
- Contributes to the overall resource base.
- Open pit Inferred resources increased by 33%.
Negative factors
- Inferred category indicates lower geological confidence.
- Lower grade typical for open pit, but still below strong threshold for porphyry.
Evidence · text
“99,800 oz Au grading at 0.81 g/t Au in the Inferred category”
Tags used in scoring
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: category is "inferred"
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: qp_signed is true
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
Metallurgical Results (1)
POX, CILGranite Creek Underground · goldRecovery: 87 %Head Grade: 7.87Head Grade Unit: g/tView all detailsHide details
Identity
- Project
- Granite Creek Underground
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada, USA
- Ticker
- IAU
Test Work
- Program Status
- detailed
- Test Type
- POX, CIL
- Processing Route
- acid pressure oxidation (POX) for refractory, carbon-in-leach (CIL) for oxide
Recovery
- Recovery
- 87 %
- Recovery Basis
- actual_test
- Head Grade
- 7.87
- Head Grade Unit
- g/t
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: The metallurgical testwork supports an average gold recovery of 87% for the Granite Creek Underground ore, utilizing an optimized processing strategy involving POX for refractory and CIL for oxide material, despite the inherent complexity of the ore.
Positive factors
- High average gold recovery (87%) for the overall processing strategy.
- Metallurgical testing demonstrated effective oxidation for refractory material.
- Optimized processing strategy using company's own plant is expected to reduce costs.
Negative factors
- Ore is predominantly refractory, requiring complex and potentially costly oxidation process.
Evidence · table
“87 %”
Context: Average Gold Recovery
Tags used in scoring
Mill Routeneutral
Processing via mill or concentrator (CIL, CIP, tank leach, flotation).
Why it applies: processing_route matches the mill_cil signal
POX/BIOX Routeneutral
Pressure or bio-oxidation for refractory ore — high CAPEX and OPEX.
Why it applies: processing_route matches the pox_biox signal
How Atlas produces this analysis
Minestarters Atlas uses automated extraction to summarize mining announcements, identify reported measurements, and classify supporting evidence. Sentiment reflects the extracted narrative and classification rules; it is an interpretation, not a reported measurement. Evidence quotes and context are provided where available. Missing data, low-confidence results, and review flags indicate limitations. Check the original publisher announcement before relying on an interpretation.