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United States
North Bullfrog Project

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 Location:
13 km N from Beatty, Nevada, United States

  Project Contacts:
Suite 1750-700 West Pender Street
Vancouver
British Columbia, Canada
V6C 1G8
Phone  ...  Subscription required
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Mine Life13 years (as of Jan 1, 2020)


Owners

Source:
CompanyInterestOwnership
AngloGold Ashanti Ltd. 100 % Indirect
The North Bullfrog Project (NBP) is 100% controlled by Corvus Gold Nevada Inc., a wholly owned subsidiary of Corvus Gold Inc.

Jan. 18, 2022 (GLOBE NEWSWIRE) -- AngloGold Ashanti Limited (“AngloGold Ashanti”) (JSE: ANG, NYSE: AU) and Corvus Gold Inc. (“Corvus” or the “Company”) (TSX: KOR, NASDAQ: KOR) are pleased to announce the successful completion of the previously announced plan of arrangement under the Business Corporations Act (British Columbia) (the “Arrangement”) between Corvus, 1323606 B.C. Unlimited Liability Company (the “Purchaser”) and AngloGold Ashanti Holdings plc (the “Guarantor”). The Purchaser is an indirect wholly owned subsidiary of AngloGold Ashanti and the Guarantor is a direct wholly owned subsidiary of AngloGold Ashanti.

Contractors

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Deposit Type

  • Epithermal
  • Volcanic hosted
  • Vein / narrow vein


Summary:

Gold mineralization in the main Bullfrog and North Bullfrog sub-districts is characterized as volcanic-hosted lowsulfidation epithermal type. Two styles of epithermal precious metal mineralization are present: 1) disseminated mineralization associated with sulfidation of iron in the volcanic host rocks; and 2) open-space filling quartz and/or carbonate veins, which are controlled by boiling. Pervasive quartz-adularia alteration of volcanic rocks is intimately associated with the disseminated mineralization and is an important ground preparation process for later vein forming events. Epithermal deposits form at shallow depth, from the surface to generally <2 kilometers. Temperatures of formation range between 150 to 300°C. Mineralization at NBP is typical of other low-sulfidation type gold systems in and around the Walker Lane trend such as: Bullfrog, Round Mountain, Rawhide, Aurora, Bodie and Comstock. These deposits commonly contain higher gold grades in vein and stockwork zones surrounded by zones of lower grade disseminated mineralization.

Corvus and previous operators exploring in the northern Bullfrog Hills have defined targets in areas of historic mines or prospects, as well as targets associated with high level epithermal alteration. Mineral Resources have been identified in several areas including: Jolly Jane, Sierra Blanca, YellowJacket, Air Track Hill, Air Track West, and Mayflower.

SIERRA BLANCA
The greater Sierra Blanca area includes th ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The proposed mining method is conventional open pit mining. Mineralized material and waste are drilled and blasted, then loaded into 133-t payload haul trucks with ~ 20 m3 bucket capacity wheel loaders. The loading and haulage fleet would be supported by track dozers, motor graders, and water trucks. Waste would be hauled to Waste Rock Management Facilities (WRMF) near each pit. Mill resources would be hauled to the mill stockpile while runof-mine (ROM) resources would be hauled and placed directly on the heap leach pad. Mill tailings would be hauled and placed directly on the heap leach pad and mixed into the ROM material by dozing.

Pit slope designs have been based on an overall 50-degree inter-ramp angle. Preliminary pit slope geotechnical evaluations at YellowJacket (Knight Piésold, 2020) indicated a 58-degree inter-ramp angle with 80-degree bench faces would be stable. Preliminary pit slope geotechnical evaluations have been performed for Sierra Blanca/YellowJacket, for Mayflower (Engineering Analytics, 2013b) and for Jolly Jane (Engineering Analytics, 2013a).

The Waste Rock Management Facilities (WRMF) were based on the current mine plan, which predicts that approximately 206.8 Mt of waste rock will require placement and management. The waste rock would be placed in four WRMFs at an overall reclaimed slope of 3H:1V (18.4°). Approximately 91.5 Mt (YellowJacket, Sierra Blanca and Savage pits) would be placed in the East WRMF, approximately 80.9 Mt (S ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 1121,461
Silver koz  ......  Subscription required
All production numbers are expressed as payable metal.

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Daily mining rate  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Annual production capacity  ......  Subscription required
Annual production capacity  ......  Subscription required
Daily processing capacity  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

Reserves at October 7, 2020:
Mill sulphide mineralization cut-off grade was 0.40 g/t
Mill oxide mineralization cut-off grade was 0.20 g/t
Heap Leach oxide mineralization cut-off grade was 0.06 g/t

CategoryOreTypeTonnage CommodityGradeContained Metal
Measured Heap leach 27,601 kt Gold 0.25 g/t 222 koz
Measured Sulphide 9,539 kt Gold 1.46 g/t 447 koz
Measured Total 37,140 kt Gold 0.56 g/t 669 koz
Measured Heap leach 27,601 kt Silver 0.78 g/t 695 koz
Measured Sulphide 9,539 kt Silver 10.18 g/t 3,121 koz
Measured Total 37,140 kt Silver 3.2 g/t 3,816 koz
Indicated Heap leach 139,867 kt Gold 0.19 g/t 848 koz
Indicated Sulphide 15,130 kt Gold 1.21 g/t 590 koz
Indicated Total 154,997 kt Gold 0.29 g/t 1,438 koz
Indicated Heap leach 139,867 kt Silver 0.62 g/t 2,788 koz
Indicated Sulphide 15,130 kt Silver 7.61 g/t 3,702 koz
Indicated Total 154,997 kt Silver 1.3 g/t 6,490 koz
Measured & Indicated Heap leach 167,469 kt Gold 0.2 g/t 1,070 koz
Measured & Indicated Sulphide 24,669 kt Gold 1.31 g/t 1,037 koz
Measured & Indicated Total 192,138 kt Gold 0.34 g/t 2,107 koz
Measured & Indicated Heap leach 167,469 kt Silver 0.65 g/t 3,483 koz
Measured & Indicated Sulphide 24,669 kt Silver 8.6 g/t 6,823 koz
Measured & Indicated Total 192,138 kt Silver 1.67 g/t 10,306 koz
Inferred Heap leach 67,254 kt Gold 0.19 g/t 401 koz
Inferred Sulphide 418 kt Gold 0.97 g/t 13 koz
Inferred Total 67,672 kt Gold 0.19 g/t 414 koz
Inferred Heap leach 67,254 kt Silver 0.55 g/t 1,185 koz
Inferred Sulphide 418 kt Silver 7.96 g/t 107 koz
Inferred Total 67,672 kt Silver 0.59 g/t 1,292 koz

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs Gold USD  ......  Subscription required *†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required *†
Assumed price Silver USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2020 study / presentation.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2020
OP mining costs ($/t milled) USD 3.23 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

2020 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 376.4
G&A costs $M USD 102.6
Total OpEx $M USD  ......  Subscription required
Mining Taxes $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 7.5% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of October 7, 2020:
HME TypeSizeQuantity
ANFO Loader ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Oct 7, 2020
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Oct 7, 2020
....................... Subscription required ....................... Subscription required Subscription required Jul 31, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
Preliminary Economic Assessment 2018
Corporate Presentation 2017
Preliminary Economic Assessment 2016
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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