Overview
| Stage | Production |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
| Mine Life | 8 years (as of Jan 1, 2021) |
Source:
p. 22
| Company | Interest | Ownership |
|
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 ........
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.
Source:
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Flow Sheet:
Summary:
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Production:
| Commodity | Units | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|
Gold
|
oz
| ...... ^ | ...... | ...... | ...... | 76,840 | 95,372 | 109,175 |
|
Silver
|
oz
| | ...... | ...... | ...... | ...... | ...... | ...... |
|
Gold Equivalent
|
oz
| | | | | ...... | ...... | ...... |
All production numbers are expressed as metal in doré.
^ Guidance / Forecast.
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Operational Metrics:
| Metrics | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|
Ore tonnes mined
| ...... | ...... | 4,829,735 tons | | | |
|
Tonnes milled
| ...... | ...... | 4,613,359 tons | 4,923,774 tons | 4,560,441 tons | 4,268,105 tons |
|
Stripping / waste ratio
| ...... | ...... | 1.85 | | | |
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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.
| Category | Tonnage | Commodity | Grade | Contained 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
|
Corporate Filings & Presentations:
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