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United States
Golden Sunlight Mine

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 Location:
8 km NE from Whitehall, Montana, United States

  Address:
453 Mt Highway 2 East
Whitehall
Montana, United States
59759
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StatusClosing / Closed
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sub-level stoping
Production Start...
Mine Life2019
The mine shut down in 2019 when gold production was no longer economically viable. Public environmental scoping comments on the project closed on March 12, 2021 and the Montana Department of Environmental Quality is currently completing its environmental review.

On February 11, 2022, the pioneering Tailings Reprocessing Project at Barrick’s end-of-life Golden Sunlight Mine was officially opened.

The facility will reprocess the ground rock, known as tailings, from which gold was previously extracted in the Golden Sunlight mills. The focus will be on removing and concentrating sulfur (iron pyrite) to be sold to and used in gold production by Barrick operated and majority owned Nevada Gold Mines, the largest gold producing complex in the world. The concentrated sulfur is not only valuable, but its removal will also eliminate a source of potential groundwater contamination. After reprocessing, the remaining benign material will be backfilled into the Mineral Hill pit.


Owners

Source: p. 6
CompanyInterestOwnership
Redpath Group (operator) Indirect
Barrick Gold Corp. 100 % Indirect
Golden Sunlight Mines Inc. 100 % Direct
Barrick Gold Corp. is a 100% owner of Golden Sunlight Mine.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Hydrothermal


Summary:

The Golden Sunlight veins are in a north-trending vein zone on the east side of the mountain, near a basin-margin fault of similar trend. Numerous small latite porphyry bodies in and near the Golden Sunlight mine are hydrothermally altered and mineralized and are the host for about 25 percent of the disseminated ore. About half of the ore body is in a breccia pipe that consists partly of fragmented argillite and partly of fragmented latite porphyry.

Quartz veins in north-trending zone cutting argillite and calcareous argillite of the Proterozoic Greyson Formation and latite of probably Late Cretaceous age. Veins are associated with a breccia pipe that hosts part of a large disseminated gold deposit. Gold is mostly free and associated with pyrite.


Mining Methods

  • Sub-level stoping


Summary:

GSM’s (Golden Sunlight Mine) underground mine, 2BUG (Stage 2B, underground), has implemented vein mining as well as sub-level longhole open stoping for recovering underground ore. Sublevel open stoping is a mining method involving sublevel drifts located above the main haulage road (Hamrin, 2001). The stope drilling is conducted from the sublevel drifts, where ore is blasted in separate portions toward an open face. Once the ore is blasted, gravity causes the ore to pile at the bottom level at the drawpoints located along the haulage route where the ore is collected and transported to the mill for processing.

Stopes at GSM can leave openings as large as 30 m (100 ft.) wide, 60 m (200 ft.) tall, and 60 m (200 ft.) long.


Crushing and Grinding


Processing

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Summary:

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Production:
With the end of mining at Golden Sunlight in the second quarter of 2019 as previously reported, Barrick has ceased to include production or non-GAAP cost metrics for this site from July 1, 2019.

CommodityUnits201920182017201620152014
Gold koz  ......  Subscription required3241346886
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined 207 kt652 kt685 kt578 kt
Tonnes processed 200 kt497 kt565 kt507 kt2,059 kt2,305 kt
Total tonnes mined 7,401 kt6,713 kt

Reserves at December 31, 2018:

CategoryTonnage CommodityGradeContained Metal
Proven 263 kt Gold 1.06 g/t 9 koz
Probable 103 kt Gold 3.32 g/t 11 koz
Proven & Probable 366 kt Gold 1.7 g/t 20 koz
Measured 120 kt Gold 1.56 g/t 6 koz
Indicated 2,777 kt Gold 1.77 g/t 158 koz
Measured & Indicated 2,897 kt Gold 1.76 g/t 164 koz
Inferred 1,604 kt Gold 1.63 g/t 84 koz

Commodity Production Costs:

CommodityUnits20192018201720162015
Cash costs Gold USD 1,772 / oz   1,270 / oz   1,385 / oz   1,121 / oz  
Cash costs Gold USD  ......  Subscription required† 1,762 / oz†   1,265 / oz†   1,376 / oz†   1,098 / oz†  
All-in sustaining costs (AISC) Gold USD 1,964 / oz   1,334 / oz   1,502 / oz   1,402 / oz  
All-in sustaining costs (AISC) Gold USD  ......  Subscription required† 1,954 / oz†   1,329 / oz†   1,493 / oz†   1,379 / oz†  
All-in costs Gold USD 1,964 / oz   1,354 / oz   1,502 / oz   1,402 / oz  
All-in costs Gold USD 1,954 / oz†   1,349 / oz†   1,493 / oz†   1,379 / oz†  
† Net of By-Product.

Operating Costs:

Units2019201820172016
UG mining costs ($/t mined) USD 5350.449.152.7
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Financials:

Units2019201820172016
Capital expenditures M USD  ......  Subscription required 3   1   2  
Sustaining costs M USD  ......  Subscription required 3   2  



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 17, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 17, 2020
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Other 2018
Other 2018
Quarterly Report 2018
Operations & Technical Update 2017
Other 2017
Press Release 2017
Quarterly Report 2017
Management Discussion & Analysis 2016
Annual Report 2015
Form 40-F 2015
Other 2015
Other 2015
Other 2015
Annual Report 2014
Form 40-F 2014
Subscription required - Subscription is required.

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