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United States
Wharf Mine

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 Location:
16 km S from Spearfish, South Dakota, United States

  Address:
10928 Wharf Road
Lead
South Dakota, United States
57754
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  • Overview
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  • Fleet
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life8 years (as of Jan 1, 2021)


Owners

Source: p. 22
CompanyInterestOwnership
Wharf Resources U.S.A. Inc. (operator) Direct
Coeur Mining, Inc. 100 % Indirect
The Wharf mine operated by wholly-owned subsidiaries, Wharf Resources (U.S.A.) Inc. and Golden Reward Mining Limited Partnership.

Contractors

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Deposit Type

  • Epithermal
  • Sediment-hosted
  • Vein / narrow vein


Summary:

The Wharf Operation deposits are considered Tertiary epithermal replacement mineralization, both intrusive-hosted and sediment-hosted (Coeur internal report, 2014). Depth of mineralization at the Wharf Operation (~1.5 km; Paterson and Giebink, 1989) is considered deeper than normal for epithermal deposits, but low temperature of mineralization are consistent with epithermal-type deposits (Paterson, 1990), although these temperatures may represent late stage of fluorite mineralization.

The main trends of mineralization at Wharf parallel the strike of a major joint sets that Shapiro and Gries (1970) measured in upper and lower Deadwood Fm. outcrops. At Golden Reward, the mineralized trends strike north-south. Mineralized trends at Golden Reward may reflect more of an influence from basement structure, as the later faults in the Golden Reward graben area may have been reactivated along faults or moved along existing foliation planes, and mineralization occurred along the same trend as the faulting.

Gold or gold-bearing minerals may be disseminated in porphyry, or may be confined to fractures (Paterson and Giebink, 1989; Paterson, 1990). Highly fractured porphyry is known to be the most mineralized, and preliminary work shows a correlation of fractured porphyry with gold, in contrast to unfractured and unmineralized rocks within mineralized zones. This, however, may be due again to gold-bearing sulfides occurring as the primary economic mineral. Porphyry n ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Wharf Operation is currently a conventional truck and loader heap leach gold mine. The mine has been in continuous operation since 1983. Wharf leases nearly all the earth moving equipment used at the mine.

In-situ ore and waste must be blasted prior to removal. Several historic pits that were partially backfilled are being mined again and the backfilled material is considered rehandle and does not require blasting. Waste material removed for access to the ore is taken to one of the rock disposal sites. Rock disposal sites are all designed to fill existing pits and are reclaimed as soon as possible after placement.


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2022202120202019201820172016
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required76,84095,372109,175
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Equivalent oz  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required4,829,735 tons
Tonnes milled  ......  Subscription required  ......  Subscription required4,613,359 tons4,923,774 tons4,560,441 tons4,268,105 tons
Stripping / waste ratio  ......  Subscription required  ......  Subscription required1.85
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Reserves at December 31, 2021:
Mineral Reserve and Mineral Resource reported above a gold cut-off grade of 0.010 oz/ton Au.

CategoryTonnage CommodityGradeContained Metal
Proven 27,976 k tons Gold 0.022 oz/ton 621 koz
Probable 8,306 k tons Gold 0.028 oz/ton 231 koz
Proven & Probable 36,282 k tons Gold 0.023 oz/ton 852 koz
Measured 13,947 k tons Gold 0.02 oz/ton 273 koz
Indicated 6,379 k tons Gold 0.022 oz/ton 139 koz
Measured & Indicated 20,326 k tons Gold 0.02 oz/ton 412 koz
Inferred 3,724 k tons Gold 0.024 oz/ton 90 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Total cash costs (sold) Gold Equivalent USD 880 / oz   697 / oz   606 / oz  
Total cash costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 879 / oz†   693 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Operating Costs:

Units20212020
OP mining costs ($/ton mined) USD 3.054.25
Processing costs ($/ton milled) USD  ......  Subscription required  ......  Subscription required
G&A ($/ton milled) USD  ......  Subscription required  ......  Subscription required
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Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 3.4   8.8   4.8  
Sustaining costs M USD 5.8   4.8  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 96.5   125.9   136.7  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 13.5   36.9   43.1  
Operating Cash Flow M USD 49.6   62.4  
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Heavy Mobile Equipment as of February 7, 2018:
HME TypeModelQuantityLeased or
Contractor
Dozer ....................... Subscription required ....................... Subscription required Leased
Dozer ....................... Subscription required ....................... Subscription required
Dozer ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required Leased
Drill ....................... Subscription required ....................... Subscription required
Drill (blasthole) ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required Leased
Loader (FEL) ....................... Subscription required ....................... Subscription required Leased
Truck (haul) ....................... Subscription required ....................... Subscription required Leased
Truck (haul) ....................... Subscription required ....................... Subscription required Leased
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Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
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Staff:

EmployeesYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 10-K 2018
Press Release 2018
Technical Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Press Release 2016
Press Release 2016
Year-end Mineral Reserves 2016
Annual Report 2015
Technical Report 2015
Year-end Mineral Reserves 2015
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