Corvus Gold Files NI 43-101 Technical Report and Preliminary Economic Assessment for its North Bullfrog Project, Nevada
Original announcement by tmx on
- Company
- Corvus Gold Inc.
- Ticker
- KOR
- Exchange
- TSX
- Region
- Nevada
- Primary commodity
- Gold
- Secondary commodities
- Silver
- Document categories
- Resource update, Metallurgy
- Extracted
- 2026-08-23 19:24:40 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Corvus Gold has filed an NI 43-101 Technical Report and Preliminary Economic Assessment (PEA) for its North Bullfrog Project in Nevada, detailing robust project economics. The PEA outlines a post-tax NPV(5%) of $246 million and an IRR of 38% at a $1,200 gold price, supported by average gold recoveries of 86.8% for mill processing and 73.9% for heap leaching. The report also includes an updated mineral resource estimate, which incorporates 2014 drilling and shows a significant increase in Measured and Indicated gold resources for the YellowJacket deposit, enhancing overall project confidence.
Reasoning: The document reports robust Preliminary Economic Assessment results for the North Bullfrog Project, including strong financial metrics and high gold and silver recoveries, supported by an updated NI 43-101 compliant mineral resource estimate with increased confidence in the Measured and Indicated categories. However, the PEA is preliminary and relies on a significant inferred resource component.
Positive factors
- strong_economics
- high_recoveries
- category_upgrade
- qp_signed
- ni_43_101_compliant
Negative factors
- pea_preliminary
- inferred_resource_reliance
- not_feasibility_study
Low confidence — this extraction should be reviewed alongside the original source.
Facts used in scoring: 24
Classification and evidence
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: The report is an independent NI 43-101 technical report and preliminary economic assessment.
Evidence · text
“independent NI 43-101 technical report”
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: Jeffrey A. Pontius, Carl E. Brechtel, and Scott E. Wilson are named as Qualified Persons who reviewed and approved the disclosure and resource estimate.
Evidence · text
“Jeffrey A. Pontius (CPG 11044), a qualified person as defined by NI 43-101, has supervised the preparation of the scientific and technical information that form the basis for this news release and has reviewed and approved the disclosure herein. Mr. Pontius is not independent of Corvus, as he is the CEO and holds common shares and incentive stock options. Carl E. Brechtel , (Nevada PE 008744 and Registered Member 353000 of SME), a qualified person as defined by NI 43-101, has coordinated execution of the work outlined in this news release and has reviewed and approved the disclosure herein. Mr. Brechtel is not independent of Corvus, as he is the COO and holds common shares and incentive stock options. ... Mr. Scott E. Wilson , CPG, President of Metal Mining Consultants Inc., is an independent consulting geologist specializing in Mineral Reserve and Resource calculation reporting, mining project analysis and due diligence evaluations. He is acting as the Qualified Person, as defined in NI 43-101, for the overall technical report, and the Mineral Resource estimate.”
PEA-Supportingneutral
Resource estimate prepared to support a Preliminary Economic Assessment — early-stage study.
Why it applies: The document is a Preliminary Economic Assessment (PEA) for the project.
Evidence · text
“preliminary economic assessment ("PEA")”
Resource Updateneutral
Revised estimate for an existing resource — compare to prior to assess progress.
Why it applies: The document includes a new resource calculation for the Yellowjacket deposit.
Evidence · text
“new resource for the high-grade gold-silver Yellowjacket deposit”
Category Upgradepositive
Resource confidence improved — Inferred upgraded to Indicated, or Indicated to Measured. De-risking signal.
Why it applies: YellowJacket/mill resource confidence increased significantly with 91% in Measured & Indicated category up from <20% in 2014 resource.
Evidence · text
“YellowJacket/mill resource confidence increased significantly with 91% in Measured & Indicated category up from <20% in 2014 resource”
High Recoverypositive
Recovery at or above the exceptional band for the commodity and processing route.
Why it applies: Average gold recovery for mill is 86.8% and for heap leach is 73.9%, which are strong for their respective processing routes.
Evidence · text
“Gold recoveries of 87% mill and 74% heap leach”
Bench Scale Onlynegative
Only preliminary bench tests completed — no locked-cycle or pilot work.
Why it applies: Metallurgical recoveries are estimated from composite samples and column leach tests, which are preliminary bench-scale tests.
Evidence · text
“The PEA uses gold and silver recoveries for a gravity-cyanide leach mill that are estimated from two sets of metallurgical composite samples developed from PQ core materials... Heap leach metallurgical recovery estimates are based on column leach testing data for composite samples constructed from Mayflower, Jolly Jane, and Sierra Blanca 2012 PQ core drilling. A total of 23 column leach tests have been run at McClelland Laboratories”
Cut-off Disclosedpositive
Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison.
Why it applies: Breakeven cut-off grades for both mill (0.52 g/t gold) and heap leach (0.15 g/t gold) are clearly stated.
Evidence · text
“0.52 g/t gold mill breakeven grade and 0.15 g/t gold heap leach breakeven grade”
Laboratory Certifiedpositive · Story-specific tag
No canonical definition is currently available.
Why it applies: ALS Chemex, the assay laboratory, complies with ISO 9001:2000 and ISO 17025:1999 standards.
Evidence · text
“ALS Chemex's quality system complies with the requirements for the International Standards ISO 9001:2000 and ISO 17025:1999.”
QA/QC Disclosedpositive · Story-specific tag
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: The release details QA/QC procedures including standards, blanks, replicate samples, and independent lab checks.
Evidence · text
“Quality control is monitored by the insertion of blind certified standard reference materials and blanks into each sample shipment. All resource sample shipments are sealed and shipped to ALS Chemex in Reno, Nevada , for preparation and then on to ALS Chemex in Reno, Nevada , or Vancouver, B.C. , for assaying. ... Analytical accuracy and precision are monitored by the analysis of reagent blanks, reference material and replicate samples. Finally, representative blind duplicate samples are forwarded to ALS Chemex and an ISO compliant third party laboratory for additional quality control.”
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, particularly for heap leach, is in the Inferred category, which is speculative.
Evidence · text
“Inferred mineral resources are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves and there is no certainty that the PEA will be realized.”
Extracted facts
Stored fact records: 24. Some facts used in scoring do not have a stored record.
Resource Estimates (24)
measuredNorth Bullfrog Project · goldTonnes: 3860000Grade: 2.55Grade Unit: g/tContained Metal: 316500Contained Unit: ozView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- gold
- Ticker
- KOR
Resource Data
- Category
- measured
- Tonnes
- 3860000
- Grade
- 2.55
- Grade Unit
- g/t
- Contained Metal
- 316500
- Contained Unit
- oz
- Cutoff Grade
- 0.52
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: High-grade Measured gold resource for milling, showing significant confidence increase and supporting robust PEA economics.
Positive factors
- category_upgrade
- ni_43_101_compliant
- qp_signed
Evidence · text
“The project contains a measured mineral resource of 3.86 Mt at an average grade of 2.55 g/t gold and 19.70 g/t silver, containing 316.5k ounces of gold and 2,445k ounces of silver, an indicated mineral resource of 1.81 Mt at an average grade of 1.53 g/t gold, and 10.20 g/t silver, containing 89.1k ounces of gold and 593.6k ounces of silver and an inferred resource of 1.48 Mt at an average grade of 0.83 g/t gold and 4.26 g/t silver, containing 39.5k ounces of gold and 202.7k ounces of silver for oxide mill processing. The mineral resource for the mill process was defined by Whittle TM optimization using all cost and recovery data and a breakeven cut-off grade of 0.52 g/t gold.”
measuredNorth Bullfrog Project · silverTonnes: 3860000Grade: 19.7Grade Unit: g/tContained Metal: 2445000Contained Unit: ozView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- silver
- Ticker
- KOR
Resource Data
- Category
- measured
- Tonnes
- 3860000
- Grade
- 19.7
- Grade Unit
- g/t
- Contained Metal
- 2445000
- Contained Unit
- oz
- Cutoff Grade
- 0.52
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: High-grade Measured silver resource for milling, contributing to the project's overall economics and confidence.
Positive factors
- category_upgrade
- ni_43_101_compliant
- qp_signed
Evidence · text
“The project contains a measured mineral resource of 3.86 Mt at an average grade of 2.55 g/t gold and 19.70 g/t silver, containing 316.5k ounces of gold and 2,445k ounces of silver, an indicated mineral resource of 1.81 Mt at an average grade of 1.53 g/t gold, and 10.20 g/t silver, containing 89.1k ounces of gold and 593.6k ounces of silver and an inferred resource of 1.48 Mt at an average grade of 0.83 g/t gold and 4.26 g/t silver, containing 39.5k ounces of gold and 202.7k ounces of silver for oxide mill processing. The mineral resource for the mill process was defined by Whittle TM optimization using all cost and recovery data and a breakeven cut-off grade of 0.52 g/t gold.”
indicatedNorth Bullfrog Project · goldTonnes: 1810000Grade: 1.53Grade Unit: g/tContained Metal: 89100Contained Unit: ozView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- gold
- Ticker
- KOR
Resource Data
- Category
- indicated
- Tonnes
- 1810000
- Grade
- 1.53
- Grade Unit
- g/t
- Contained Metal
- 89100
- Contained Unit
- oz
- Cutoff Grade
- 0.52
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Indicated gold resource for milling, showing increased confidence and contributing to the project's economic viability.
Positive factors
- category_upgrade
- ni_43_101_compliant
- qp_signed
Evidence · text
“The project contains a measured mineral resource of 3.86 Mt at an average grade of 2.55 g/t gold and 19.70 g/t silver, containing 316.5k ounces of gold and 2,445k ounces of silver, an indicated mineral resource of 1.81 Mt at an average grade of 1.53 g/t gold, and 10.20 g/t silver, containing 89.1k ounces of gold and 593.6k ounces of silver and an inferred resource of 1.48 Mt at an average grade of 0.83 g/t gold and 4.26 g/t silver, containing 39.5k ounces of gold and 202.7k ounces of silver for oxide mill processing. The mineral resource for the mill process was defined by Whittle TM optimization using all cost and recovery data and a breakeven cut-off grade of 0.52 g/t gold.”
indicatedNorth Bullfrog Project · silverTonnes: 1810000Grade: 10.2Grade Unit: g/tContained Metal: 593600Contained Unit: ozView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- silver
- Ticker
- KOR
Resource Data
- Category
- indicated
- Tonnes
- 1810000
- Grade
- 10.2
- Grade Unit
- g/t
- Contained Metal
- 593600
- Contained Unit
- oz
- Cutoff Grade
- 0.52
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Indicated silver resource for milling, contributing to the project's economic viability and confidence.
Positive factors
- category_upgrade
- ni_43_101_compliant
- qp_signed
Evidence · text
“The project contains a measured mineral resource of 3.86 Mt at an average grade of 2.55 g/t gold and 19.70 g/t silver, containing 316.5k ounces of gold and 2,445k ounces of silver, an indicated mineral resource of 1.81 Mt at an average grade of 1.53 g/t gold, and 10.20 g/t silver, containing 89.1k ounces of gold and 593.6k ounces of silver and an inferred resource of 1.48 Mt at an average grade of 0.83 g/t gold and 4.26 g/t silver, containing 39.5k ounces of gold and 202.7k ounces of silver for oxide mill processing. The mineral resource for the mill process was defined by Whittle TM optimization using all cost and recovery data and a breakeven cut-off grade of 0.52 g/t gold.”
inferredNorth Bullfrog Project · goldTonnes: 1480000Grade: 0.83Grade Unit: g/tContained Metal: 39500Contained Unit: ozView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- gold
- Ticker
- KOR
Resource Data
- Category
- inferred
- Tonnes
- 1480000
- Grade
- 0.83
- Grade Unit
- g/t
- Contained Metal
- 39500
- Contained Unit
- oz
- Cutoff Grade
- 0.52
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Inferred gold resource for milling, which is speculative and cannot be converted to reserves without further work, but contributes to overall project potential.
Positive factors
- ni_43_101_compliant
- qp_signed
Negative factors
- inferred_resource
- pea_preliminary
Evidence · text
“The project contains a measured mineral resource of 3.86 Mt at an average grade of 2.55 g/t gold and 19.70 g/t silver, containing 316.5k ounces of gold and 2,445k ounces of silver, an indicated mineral resource of 1.81 Mt at an average grade of 1.53 g/t gold, and 10.20 g/t silver, containing 89.1k ounces of gold and 593.6k ounces of silver and an inferred resource of 1.48 Mt at an average grade of 0.83 g/t gold and 4.26 g/t silver, containing 39.5k ounces of gold and 202.7k ounces of silver for oxide mill processing. The mineral resource for the mill process was defined by Whittle TM optimization using all cost and recovery data and a breakeven cut-off grade of 0.52 g/t gold.”
inferredNorth Bullfrog Project · silverTonnes: 1480000Grade: 4.26Grade Unit: g/tContained Metal: 202700Contained Unit: ozView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- silver
- Ticker
- KOR
Resource Data
- Category
- inferred
- Tonnes
- 1480000
- Grade
- 4.26
- Grade Unit
- g/t
- Contained Metal
- 202700
- Contained Unit
- oz
- Cutoff Grade
- 0.52
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Inferred silver resource for milling, which is speculative and cannot be converted to reserves without further work, but contributes to overall project potential.
Positive factors
- ni_43_101_compliant
- qp_signed
Negative factors
- inferred_resource
- pea_preliminary
Evidence · text
“The project contains a measured mineral resource of 3.86 Mt at an average grade of 2.55 g/t gold and 19.70 g/t silver, containing 316.5k ounces of gold and 2,445k ounces of silver, an indicated mineral resource of 1.81 Mt at an average grade of 1.53 g/t gold, and 10.20 g/t silver, containing 89.1k ounces of gold and 593.6k ounces of silver and an inferred resource of 1.48 Mt at an average grade of 0.83 g/t gold and 4.26 g/t silver, containing 39.5k ounces of gold and 202.7k ounces of silver for oxide mill processing. The mineral resource for the mill process was defined by Whittle TM optimization using all cost and recovery data and a breakeven cut-off grade of 0.52 g/t gold.”
measuredNorth Bullfrog Project · goldTonnes: 300000Grade: 0.25Grade Unit: g/tContained Metal: 2400Contained Unit: ozView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- gold
- Ticker
- KOR
Resource Data
- Category
- measured
- Tonnes
- 300000
- Grade
- 0.25
- Grade Unit
- g/t
- Contained Metal
- 2400
- Contained Unit
- oz
- Cutoff Grade
- 0.15
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Measured gold resource for heap leach processing, contributing to the project's overall economic viability.
Positive factors
- ni_43_101_compliant
- qp_signed
Evidence · text
“In addition, the project contains a measured mineral resource of 0.3 Mt at an average grade of 0.25 g/t gold and 2.76 g/t silver, containing 2.4k ounces of gold and 26.6k ounces of silver, an indicated mineral resource of 22.86 Mt at an average grade of 0.30 g/t gold and 0.43 g/t silver, containing 220.5k ounces of gold and 316.1k ounces of silver and an inferred mineral resource of 176.3 Mt at an average grade of 0.19 g/t gold and 0.67 g/t silver, containing 1,077.4k ounces of gold and 3,799.2k ounces of silver for oxide, heap leach processing. The mineral resource for heap leach processing was defined by Whittle TM optimization using all cost and recovery data and a breakeven cut-off grade of 0.15 g/t.”
measuredNorth Bullfrog Project · silverTonnes: 300000Grade: 2.76Grade Unit: g/tContained Metal: 26600Contained Unit: ozView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- silver
- Ticker
- KOR
Resource Data
- Category
- measured
- Tonnes
- 300000
- Grade
- 2.76
- Grade Unit
- g/t
- Contained Metal
- 26600
- Contained Unit
- oz
- Cutoff Grade
- 0.15
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Measured silver resource for heap leach processing, contributing to the project's overall economic viability.
Positive factors
- ni_43_101_compliant
- qp_signed
Evidence · text
“In addition, the project contains a measured mineral resource of 0.3 Mt at an average grade of 0.25 g/t gold and 2.76 g/t silver, containing 2.4k ounces of gold and 26.6k ounces of silver, an indicated mineral resource of 22.86 Mt at an average grade of 0.30 g/t gold and 0.43 g/t silver, containing 220.5k ounces of gold and 316.1k ounces of silver and an inferred mineral resource of 176.3 Mt at an average grade of 0.19 g/t gold and 0.67 g/t silver, containing 1,077.4k ounces of gold and 3,799.2k ounces of silver for oxide, heap leach processing. The mineral resource for heap leach processing was defined by Whittle TM optimization using all cost and recovery data and a breakeven cut-off grade of 0.15 g/t.”
indicatedNorth Bullfrog Project · goldTonnes: 22860000Grade: 0.3Grade Unit: g/tContained Metal: 220500Contained Unit: ozView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- gold
- Ticker
- KOR
Resource Data
- Category
- indicated
- Tonnes
- 22860000
- Grade
- 0.3
- Grade Unit
- g/t
- Contained Metal
- 220500
- Contained Unit
- oz
- Cutoff Grade
- 0.15
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Indicated gold resource for heap leach processing, contributing significantly to the project's economic viability.
Positive factors
- ni_43_101_compliant
- qp_signed
Evidence · text
“In addition, the project contains a measured mineral resource of 0.3 Mt at an average grade of 0.25 g/t gold and 2.76 g/t silver, containing 2.4k ounces of gold and 26.6k ounces of silver, an indicated mineral resource of 22.86 Mt at an average grade of 0.30 g/t gold and 0.43 g/t silver, containing 220.5k ounces of gold and 316.1k ounces of silver and an inferred mineral resource of 176.3 Mt at an average grade of 0.19 g/t gold and 0.67 g/t silver, containing 1,077.4k ounces of gold and 3,799.2k ounces of silver for oxide, heap leach processing. The mineral resource for heap leach processing was defined by Whittle TM optimization using all cost and recovery data and a breakeven cut-off grade of 0.15 g/t.”
indicatedNorth Bullfrog Project · silverTonnes: 22860000Grade: 0.43Grade Unit: g/tContained Metal: 316100Contained Unit: ozView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- silver
- Ticker
- KOR
Resource Data
- Category
- indicated
- Tonnes
- 22860000
- Grade
- 0.43
- Grade Unit
- g/t
- Contained Metal
- 316100
- Contained Unit
- oz
- Cutoff Grade
- 0.15
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Indicated silver resource for heap leach processing, contributing to the project's economic viability.
Positive factors
- ni_43_101_compliant
- qp_signed
Evidence · text
“In addition, the project contains a measured mineral resource of 0.3 Mt at an average grade of 0.25 g/t gold and 2.76 g/t silver, containing 2.4k ounces of gold and 26.6k ounces of silver, an indicated mineral resource of 22.86 Mt at an average grade of 0.30 g/t gold and 0.43 g/t silver, containing 220.5k ounces of gold and 316.1k ounces of silver and an inferred mineral resource of 176.3 Mt at an average grade of 0.19 g/t gold and 0.67 g/t silver, containing 1,077.4k ounces of gold and 3,799.2k ounces of silver for oxide, heap leach processing. The mineral resource for heap leach processing was defined by Whittle TM optimization using all cost and recovery data and a breakeven cut-off grade of 0.15 g/t.”
inferredNorth Bullfrog Project · goldTonnes: 176300000Grade: 0.19Grade Unit: g/tContained Metal: 1077400Contained Unit: ozView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- gold
- Ticker
- KOR
Resource Data
- Category
- inferred
- Tonnes
- 176300000
- Grade
- 0.19
- Grade Unit
- g/t
- Contained Metal
- 1077400
- Contained Unit
- oz
- Cutoff Grade
- 0.15
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Large Inferred gold resource for heap leach processing, which is speculative but represents significant future potential.
Positive factors
- ni_43_101_compliant
- qp_signed
Negative factors
- inferred_resource
- pea_preliminary
Evidence · text
“In addition, the project contains a measured mineral resource of 0.3 Mt at an average grade of 0.25 g/t gold and 2.76 g/t silver, containing 2.4k ounces of gold and 26.6k ounces of silver, an indicated mineral resource of 22.86 Mt at an average grade of 0.30 g/t gold and 0.43 g/t silver, containing 220.5k ounces of gold and 316.1k ounces of silver and an inferred mineral resource of 176.3 Mt at an average grade of 0.19 g/t gold and 0.67 g/t silver, containing 1,077.4k ounces of gold and 3,799.2k ounces of silver for oxide, heap leach processing. The mineral resource for heap leach processing was defined by Whittle TM optimization using all cost and recovery data and a breakeven cut-off grade of 0.15 g/t.”
inferredNorth Bullfrog Project · silverTonnes: 176300000Grade: 0.67Grade Unit: g/tContained Metal: 3799200Contained Unit: ozView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- silver
- Ticker
- KOR
Resource Data
- Category
- inferred
- Tonnes
- 176300000
- Grade
- 0.67
- Grade Unit
- g/t
- Contained Metal
- 3799200
- Contained Unit
- oz
- Cutoff Grade
- 0.15
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Large Inferred silver resource for heap leach processing, which is speculative but represents significant future potential.
Positive factors
- ni_43_101_compliant
- qp_signed
Negative factors
- inferred_resource
- pea_preliminary
Evidence · text
“In addition, the project contains a measured mineral resource of 0.3 Mt at an average grade of 0.25 g/t gold and 2.76 g/t silver, containing 2.4k ounces of gold and 26.6k ounces of silver, an indicated mineral resource of 22.86 Mt at an average grade of 0.30 g/t gold and 0.43 g/t silver, containing 220.5k ounces of gold and 316.1k ounces of silver and an inferred mineral resource of 176.3 Mt at an average grade of 0.19 g/t gold and 0.67 g/t silver, containing 1,077.4k ounces of gold and 3,799.2k ounces of silver for oxide, heap leach processing. The mineral resource for heap leach processing was defined by Whittle TM optimization using all cost and recovery data and a breakeven cut-off grade of 0.15 g/t.”
Fact 13North Bullfrog Project · goldView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- gold
- Ticker
- KOR
Lab
- Laboratory
- ALS Chemex
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: High average gold recovery for mill processing, indicating good metallurgical performance, though based on preliminary composite samples.
Positive factors
- high_recovery
Negative factors
- bench_scale_only
Evidence · text
“Average recoveries of 86.8% for gold and 71.4% for silver were assumed for the mill process plant.”
Fact 14North Bullfrog Project · silverView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- silver
- Ticker
- KOR
Lab
- Laboratory
- ALS Chemex
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: High average silver recovery for mill processing, indicating good metallurgical performance, though based on preliminary composite samples.
Positive factors
- high_recovery
Negative factors
- bench_scale_only
Evidence · text
“Average recoveries of 86.8% for gold and 71.4% for silver were assumed for the mill process plant.”
Fact 15North Bullfrog Project · goldView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- gold
- Ticker
- KOR
Lab
- Laboratory
- McClelland Laboratories
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Strong average gold recovery for heap leach processing, supporting the economic viability of the low-grade material, based on column leach tests.
Positive factors
- high_recovery
Negative factors
- bench_scale_only
Evidence · text
“The recovery model predicted LOM average gold recovery to be 74% of contained gold content”
Fact 16North Bullfrog Project · silverView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- silver
- Ticker
- KOR
Lab
- Laboratory
- McClelland Laboratories
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Low average silver recovery for heap leach processing, indicating limited economic contribution from silver in this processing route.
Negative factors
- low_recovery
- bench_scale_only
Evidence · text
“and 6% of contained silver content”
Fact 17North Bullfrog Project · goldView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- gold
- Ticker
- KOR
Lab
- Laboratory
- ALS Chemex
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: High gold recovery for YellowJacket milling, supporting the economic viability of this high-grade material.
Positive factors
- high_recovery
Negative factors
- bench_scale_only
Evidence · table
“86.8”
Context: YellowJacket**
Fact 18North Bullfrog Project · silverView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- silver
- Ticker
- KOR
Lab
- Laboratory
- ALS Chemex
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: High silver recovery for YellowJacket milling, supporting the economic viability of this high-grade material.
Positive factors
- high_recovery
Negative factors
- bench_scale_only
Evidence · table
“71.4”
Context: YellowJacket**
Fact 19North Bullfrog Project · goldView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- gold
- Ticker
- KOR
Lab
- Laboratory
- McClelland Laboratories
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Good gold recovery for Mayflower heap leach, contributing to the overall project economics.
Positive factors
- high_recovery
Negative factors
- bench_scale_only
Evidence · table
“70.0”
Context: Mayflower*
Fact 20North Bullfrog Project · silverView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- silver
- Ticker
- KOR
Lab
- Laboratory
- McClelland Laboratories
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Low silver recovery for Mayflower heap leach, indicating limited economic contribution from silver in this processing route.
Negative factors
- low_recovery
- bench_scale_only
Evidence · table
“8.0”
Context: Mayflower*
Fact 21North Bullfrog Project · goldView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- gold
- Ticker
- KOR
Lab
- Laboratory
- McClelland Laboratories
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Strong gold recovery for Jolly Jane heap leach, contributing to the overall project economics.
Positive factors
- high_recovery
Negative factors
- bench_scale_only
Evidence · table
“72.0”
Context: Jolly Jane*
Fact 22North Bullfrog Project · silverView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- silver
- Ticker
- KOR
Lab
- Laboratory
- McClelland Laboratories
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Low silver recovery for Jolly Jane heap leach, indicating limited economic contribution from silver in this processing route.
Negative factors
- low_recovery
- bench_scale_only
Evidence · table
“8.0”
Context: Jolly Jane*
Fact 23North Bullfrog Project · goldView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- gold
- Ticker
- KOR
Lab
- Laboratory
- McClelland Laboratories
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Strong gold recovery for Sierra Blanca heap leach, contributing to the overall project economics.
Positive factors
- high_recovery
Negative factors
- bench_scale_only
Evidence · table
“74.0”
Context: Sierra Blanca*
Fact 24North Bullfrog Project · silverView all detailsHide details
Identity
- Project
- North Bullfrog Project
- Commodity
- silver
- Ticker
- KOR
Lab
- Laboratory
- McClelland Laboratories
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2015-08-04T00:00:00.000Z
Reasoning: Zero silver recovery for Sierra Blanca heap leach, indicating no economic contribution from silver in this processing route.
Negative factors
- low_recovery
- bench_scale_only
Evidence · table
“0”
Context: Sierra Blanca*
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.