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United States
Isabella Pearl Mine

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 Location:
174 SE from Reno, Nevada, United States

  Address:
2886 Carriage Manor Point
Colorado Springs
Colorado, United States
80906
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life4 years (as of Jan 1, 2021)
Latest NewsFortitude Gold Reports 2022 Net Income of $14.7 Million, $725 All-In Sustaining Cost, and Increased Cash Balance to $45 Million     February 28, 2023


Owners

Source: p. 91
CompanyInterestOwnership
Fortitude Gold Corp. 100 % Indirect
Isabella Pearl mine is 100%-controlled by Walker Lane Minerals Corporation (WLMC), a wholly-owned subsidiary of Fortitude Gold Corporation (FGC).

Contractors

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Deposit Type

  • Epithermal


Summary:

Alteration and mineral assemblages throughout the deposit are represented by widespread argillic alteration, generally abundant alunite, and the presence of minor amounts of base metals, all of which indicate the ore deposits to belong to the high sulfidation (acid sulfate) class of epithermal mineral deposits. Fluid inclusion data indicates the solutions that deposited the coarse-grained quartz were dilute, with a salinity of 1-2 weight percent NaCl and temperatures ranging 200 to 300° C. Temporal relationships and the thickness of the tuff units suggest that the depth of formation was more than 900m. The geometry of the deposit is controlled by two dominant geologic features; favorable stratigraphic horizon, and structural connectivity to mineralizing fluids. In high sulfidation environments the fluids ascend via structural feeders and under acid attack particularly replaces more favorable units; in the case of Isabella Pearl the Guild Mine member of the Mickey pass Tuff was this unit.

The gold-silver mineralized zones include the Isabella, Pearl, and Civit Cat oxide deposits and the Pearl and Civit Cat sulfide deposits, collectively referred to in this report as the Isabella Pearl deposit. Alteration and mineral assemblages at Isabella Pearl, including widespread argillic alteration and generally abundant alunite, indicate the deposits belong to the high-sulfidation class of epithermal mineral deposits. K-Ar age determinations indicate the mineralization is abou ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Isabella Pearl mine design consists of one main pit and several smaller sub-pits accessing the Isabella, Pearl and Civit Cat North deposits. Open pit mining is conducted by conventional diesel-powered equipment, utilizing a combination of blasthole drills, wheel loaders, and 91-tonne (100-short ton) trucks to define, and handle ore and waste. Support equipment includes graders, track dozers, and water trucks. Higher-grade ore (>0.61 g/t Au) is hauled to the crushing area and crushed before being placed on the leach pad. Low-grade ore between 0.33 and 0.61 g/t Au is hauled directly to the low-grade stockpile. Waste rock is stored in the waste rock facility located near the pit to reduce haulage costs.

The final pit was designed using 6 m (20 ft) benches with a bench face angle of 68°, and an inter-ramp slope of 49.7° between a triple bench-catch of 8 m (26 ft). Haul roads were designed to 14 m (46 ft) widths for one-way traffic and 24 m (79 ft) widths for two-way traffic. These widths included an external safety berm in compliance with Mine Safety and Health Administration (MSHA) regulations. The final location of the ramps was optimized to reduce the overall waste stripping in areas where the pit slope was required to be less than 50°.

Low-grade ROM ore was initially placed on the heap leach pad with only lime addition on pad areas protected by a minimum of four feet of cover over the leach pad liner and collector piping system. Currently, high-grade ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits2022202120202019
Gold Metal in doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in doré oz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Payable metal koz
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019
Ore tonnes mined  ......  Subscription required  ......  Subscription required1,464,682 t
Waste  ......  Subscription required  ......  Subscription required4,504,360 t
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Reserves at December 31, 2021:
Reported at a cut-off of 0.33 Au g/t (0.01 Au opst) for oxide mineral resources and 2.00 Au g/t (0.058 opst) for sulfide mineral resources.

Mineral Reserves: the quantities of material within the designed pits were calculated using a cut-off grade of 0.33 Au g/t.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven 483,300 t Gold 5.26 g/t 81,800 oz
Proven 483,300 t Silver 47 g/t 733,100 oz
Probable 425,500 t Gold 2.04 g/t 27,900 oz
Probable 425,500 t Silver 16 g/t 221,000 oz
Proven & Probable Stockpiles 449,000 t Gold 0.82 g/t 11,800 oz
Proven & Probable Total 1,357,800 t Gold 2.78 g/t 121,500 oz
Proven & Probable Stockpiles 449,000 t Silver 7.2 g/t 103,500 oz
Proven & Probable Total 1,357,800 t Silver 24 g/t 1,057,600 oz
Measured 199,600 t Gold 3.82 g/t 24,500 oz
Measured 199,600 t Silver 53 g/t 337,700 oz
Indicated 398,400 t Gold 1.27 g/t 16,300 oz
Indicated 398,400 t Silver 12 g/t 158,900 oz
Measured & Indicated 598,000 t Gold 2.12 g/t 40,800 oz
Measured & Indicated 598,000 t Silver 26 g/t 496,600 oz
Inferred 288,200 t Gold 1.55 g/t 14,400 oz
Inferred 288,200 t Silver 17 g/t 154,400 oz

Commodity Production Costs:

CommodityUnits202120202019
Credits (by-product) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total cash costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
† Net of By-Product.
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Financials:

Units202120202019
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gross profit M USD  ......  Subscription required  ......  Subscription required
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Operating Cash Flow M USD  ......  Subscription required  ......  Subscription required
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Heavy Mobile Equipment as of December 31, 2021:
HME TypeModelSizeQuantityLeased or
Contractor
Dozer (crawler) ....................... Subscription required ....................... Subscription required Leased
Dozer (crawler) ....................... Subscription required ....................... Subscription required Leased
Drill (blasthole) ....................... Subscription required ....................... Subscription required Leased
Grader ....................... Subscription required ....................... Subscription required Leased
Loader (FEL) ....................... Subscription required ....................... Subscription required Leased
Loader (FEL) ....................... Subscription required 16 cu. yd ....................... Subscription required Leased
Truck (fuel / lube) ....................... Subscription required Leased
Truck (haul) ....................... Subscription required 91 t ....................... Subscription required Leased
Truck (service) ....................... Subscription required Leased
Truck (water) ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 16, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 16, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 16, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 16, 2023
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2021
Subscription required 2020
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Feasibility Study Report 2017
Subscription required - Subscription is required.

News:

NewsDate
Fortitude Gold Reports 2022 Net Income of $14.7 Million, $725 All-In Sustaining Cost, and Increased Cash Balance to $45 Million February 28, 2023
Fortitude Gold Intercepts High-Grade Including 21.34 Meters Grading 7.21 g/t Gold Below Isabella Pearl Pit February 8, 2023

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