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United States
Rochester Mine

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 Location:
29 km NE from Lovelock, Nevada, United States

  Address:
I-80
Lovelock
Nevada, United States
89419
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Silver
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life13 years (as of Jan 1, 2021)


Owners

Source: p. 21
CompanyInterestOwnership
Coeur Mining, Inc. 100 % Indirect
Coeur Rochester, Inc. (operator) 100 % Direct
Coeur Mining, Inc. owns 100% of the Rochester mine through its wholly-owned subsidiary, Coeur Rochester, Inc. The mine consists of the main Rochester deposit and the adjacent Nevada Packard deposit, southwest of the Rochester mine.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Breccia pipe / Stockwork
  • Epithermal


Summary:

Rochester is a complex deposit, with structurally controlled and disseminated silver-gold mineralization occurring within extensive zones of QSP-type alteration and silicification. In addition, many high-grade (>3 opt Ag) silver-gold vein occurrences hosted in faults exhibit chalcedonic or vuggy, crystalline quartz. These textures indicate an epithermal origin, possibly related to the later Cretaceous Rocky Canyon intrusion event. Low tenor, but persistent gold values distributed throughout the deposit appear to be associated with disseminated pyrite. The Rochester District exhibits characteristics of both low-sulfidation and intermediate-sulfidation precious metal systems, complicated by supergene enrichment processes and significant oxidation in much of the deposit.

Supergene enrichment is commonly found in porphyry copper deposits, but some recent work has shown supergene enrichment in silver-rich deposits (Anderson, 2016). This appears to be the case at Rochester. Supergene enrichment is a process where meteoric waters percolate through pyrite-rich rocks that contain acid-soluble, metal-bearing minerals. Dissolved sulfide minerals then re- precipitate at or below the water table, which enriches sulfide mineralization and associated metals. Oxidized pyrite at Rochester could have provided the acid needed to remobilize and redeposit silver.

Silver and gold mineralization at the Rochester and Nevada Packard mines is hosted by the Rochester and Weaver Fo ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Since 1986, Coeur has mined at Rochester by conventional open pit, drill and blast, truck, and loader methods.

Operations at Rochester consist of mining from in situ and stockpiled open pit sources that is fed directly into the primary crusher dump pocket and crushed product is placed directly onto a heap leach pad for processing.

Blasting services are contracted at the Rochester Mine. The contractor is responsible for obtaining, securing explosive agents, loading blast holes, and initiating the blasts.

Blast patterns and locations are laid out by Coeur Rochester engineers and surveyors. Three blast hole drills are used to drill the typical square blast pattern of 15 × 15 ft. on a 30 ft.-high bench, with 3 ft. of sub drill. Shots typically consist of 350 to 450 holes. Three row trim shots are used near highwalls to protect the highwall from blast damage. Trim shots are laid out on a 15 × 15 ft. pattern.

Current blasting practices at Rochester employ the use of Ammonium Nitrate and Fuel Oil (ANFO). Emulsion blends are used where necessary. Non-electric detonators are used for initiating and timing the blast. Stemming depth with crushed rock varies but is typically 11 ft. deep

All waste rock is placed either inside the pit perimeter as backfill, or outside the pit in the approved RDSs. Waste rock is defined as material below cut-off; however, it could still contain some mineralization. It is then further evaluated to deter ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2022202120202019201820172016
Silver koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required5,0384,7144,564
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent koz  ......  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 required
Stripping / waste ratio  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required10,582,518 tons16,169,807 tons16,440,270 tons19,555,998 tons
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Reserves at December 31, 2021:
Mineral Reserve estimates are tabulated within a confining pit shell and use the following input parameters: Rochester oxide recovery Au = 85% and Ag = 59%; Nevada Packard oxide recovery Au = 95% and Ag = 61%; with a net smelter return cutoff of $2.55/st oxide and US$2.65/st sulfide.
Mineral Resource estimates are tabulated within confining pit shells that uses the following input parameters: oxide gold recovery of 77.7%-93.7% and silver recovery with range of 59%-61%; sulfide gold recovery range of 15.2%-77.7% and silver recovery with range of 0.0%-59% with a net smelter return cutoff of US$2.55–US$3.70/ton oxide and US$2.65/ton sulfide.

CategoryTonnage CommodityGradeContained Metal
Proven 386,008 k tons Silver 0.39 oz/ton 149,652 koz
Proven 386,008 k tons Gold 0.003 oz/ton 998 koz
Probable 31,769 k tons Silver 0.36 oz/ton 11,593 koz
Probable 31,769 k tons Gold 0.003 oz/ton 82 koz
Proven & Probable 417,777 k tons Silver 0.39 oz/ton 161,245 koz
Proven & Probable 417,777 k tons Gold 0.003 oz/ton 1,080 koz
Measured 191,889 k tons Silver 0.29 oz/ton 56,573 koz
Measured 191,889 k tons Gold 0.002 oz/ton 372 koz
Indicated 39,565 k tons Silver 0.33 oz/ton 12,932 koz
Indicated 39,565 k tons Gold 0.002 oz/ton 74 koz
Measured & Indicated 231,454 k tons Silver 0.3 oz/ton 69,505 koz
Measured & Indicated 231,454 k tons Gold 0.002 oz/ton 446 koz
Inferred 128,410 k tons Silver 0.3 oz/ton 38,626 koz
Inferred 128,410 k tons Gold 0.002 oz/ton 243 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Total cash costs (sold) Silver USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 11.5 / oz   12 / oz  
Total cash costs (sold) Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 941 / oz   889 / oz  
Total cash costs (sold) Silver Equivalent USD 13.2 / oz   13.2 / oz   11.9 / oz  
^ Guidance / Forecast.
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Operating Costs:

Units20212020
OP mining costs ($/ton mined) USD 2.641.72
Processing costs ($/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 9.9   40.9   16.4  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 141.8   152.7   139.9  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 5.3   17.5   13.3  
Operating Cash Flow M USD 32.3   28.4  
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Heavy Mobile Equipment as of December 16, 2020:
HME TypeModelQuantity
Drill (blasthole) ....................... Subscription required
Loader (FEL) ....................... Subscription required ....................... Subscription required
Shovel (hydraulic) ....................... Subscription required ....................... Subscription required
Shovel (hydraulic) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameEmailProfileRef. Date
....................... 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
....................... 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 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 10-K 2018
Preliminary Economic Assessment 2018
Press Release 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Technical Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Press Release 2016
Year-end Mineral Reserves 2016
Annual Report 2015
Technical Report 2015
Annual Report 2014
Annual Report 2013
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