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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
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
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  • Filings & News

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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, 2022)
Rochester is currently undergoing an expansion under POA 11. The expansion project includes the construction of a new leach pad, a crushing facility equipped with two high-pressure grinding roll units and a prescreen, a Merrill-Crowe process plant, and related infrastructure to support the extension of Rochester’s mine life and is expected to be completed in mid-2023.

Coeur Rochester also acquired the Lincoln Hill, Gold Ridge, and related exploration assets adjacent to its Rochester mine in 2018.


Owners

Source: p. 25
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:

Mineralization in the Rochester district exhibits characteristics of both low-sulfidation and intermediate-sulfidation precious metal systems, complicated by supergene enrichment processes and significant oxidation.

Epithermal mineralization associated with hydrothermal activity related to volcanism or the resulting geothermal activity of circulating meteoric waters at relatively shallow depths and low temperatures. Precious metal epithermal deposits may exhibit stockworks, breccia pipes, and disseminated mineralization. The level of sulfidation (high, intermediate, or low-sulfidation) refers only to sulfide mineralogy. Pyrite, chalcopyrite, arsenopyrite, polybasite, acanthite, and at depth, other base metals (including the minerals galena and sphalerite) are common.

The Rochester and Nevada Packard mines are located on the southern flank of the Humboldt Range within the Basin-and-Range province, where late Tertiary extension created large listric normal faults bounding generally north–south-trending mountain ranges and adjacent downdropped valleys. A major structural feature within the southern portion of the Humboldt Range is the Black Ridge fault system, which is an extensive shear zone that is, in places, hundreds of feet wide. Most of the Rochester silver–gold mineralization occurs in hanging wall faults, splays, and cross-faults within the Black Ridge system.

Mineralization is structurally controlled. Economic mineralization is hosted ma ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mineral reserves are exploited using conventional open pit methods and equipment.

Mining operations at Rochester are currently at capacity and will increase under 11th Plan of Operations
Amendment (POA 11), which was issued in 2020. POA 11 allows for additional pad capacity, additional WRSF facilities, and extensions of the Rochester pit and continued operations through the end of planned mine life.

Pit slope designs are based on evaluations and reports prepared by third-party consultants. The
pit slope design parameters for Rochester and Nevada Packard assume overall pit slope angles
that range from 20–51º and 37–52.4º respectively.

Detailed pit designs and phase plans are based on the economic pit limits and are used to generate a mining production schedule for both pits. Designs assumed 30 ft bench heights, double lane haul road design widths of 88 ft, single lane haul road design widths of 65 ft, and maximum haul road gradients of 10%.

The pit design parameters for Rochester:
- Bench height - 30 ft;
- Catch bench vertical spacing - 30–60 ft;
- Minimum mining width between phases - 120 ft;
- Double lane haul road design width - 88 ft;
- Single lane haul road design width - 65 ft;
- Max haul road gradient - 10%;
- Rolling resistance - 2%.

The pit design parameters for Nevada Packard:
- Bench height - 30 ft;
- Catch bench vertical spacing - 60 ft;
- Mi ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2023202220212020201920182017
Silver koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required5,0384,714
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent koz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required10,582,518 tons16,169,807 tons16,440,270 tons
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Reserves at December 31, 2022:
Mineral Reserve estimates are use the following input parameters: Rochester oxide variable recovery Au = 77.7-93.7% and Ag = 59.4%; Rochester sulfide variable recovery Au = 15.2-77.7% and Ag = 0.0-59.4%; with a net smelter return cutoff of $3.25/st oxide and US$3.35/st sulfide; Nevada Packard oxide recovery Au = 92.0% and Ag = 61.0%; with a net smelter return cutoff of $4.40/st for oxide.

Mineral Resource estimates are use the following input parameters: Rochester oxide variable recovery Au = 77.7-93.7% and Ag = 59.4%; Rochester sulfide variable recovery Au = 15.2-77.7% and Ag = 0.0-59.4%; with a net smelter return cutoff of $3.25/st oxide and US$3.35/st sulfide; Nevada Packard oxide recovery Au = 92.0% and Ag = 61.0%; with a net smelter return cutoff of $4.40/st for oxide.

CategoryTonnage CommodityGradeContained Metal
Proven 425,748 k tons Silver 0.39 oz/ton 166,172 koz
Proven 425,748 k tons Gold 0.003 oz/ton 1,079 koz
Probable 38,001 k tons Silver 0.36 oz/ton 13,803 koz
Probable 38,001 k tons Gold 0.002 oz/ton 93 koz
Proven & Probable 463,749 k tons Silver 0.39 oz/ton 179,975 koz
Proven & Probable 463,749 k tons Gold 0.003 oz/ton 1,172 koz
Measured 94,296 k tons Silver 0.33 oz/ton 31,452 koz
Measured 94,296 k tons Gold 0.002 oz/ton 187 koz
Indicated 15,507 k tons Silver 0.34 oz/ton 5,332 koz
Indicated 15,507 k tons Gold 0.002 oz/ton 27 koz
Measured & Indicated 109,803 k tons Silver 0.33 oz/ton 36,784 koz
Measured & Indicated 109,803 k tons Gold 0.002 oz/ton 214 koz
Inferred 77,001 k tons Silver 0.34 oz/ton 26,151 koz
Inferred 77,001 k tons Gold 0.002 oz/ton 148 koz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Total cash costs (sold) Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 11.5 / oz   12 / oz  
Total cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 941 / oz   889 / oz  
Total cash costs (sold) Silver Equivalent USD 13.2 / oz   13.2 / oz  
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Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 9.9   40.9  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 141.8   152.7  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 5.3   17.5  
Operating Cash Flow M USD 32.3  
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Water Supply
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Heavy Mobile Equipment as of December 31, 2021:
HME TypeModelSizeQuantityStatus
Dozer (crawler) ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required Proposed
Drill (blasthole) ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required Proposed
....................... Subscription required ....................... Subscription required Proposed
Loader (FEL) ....................... Subscription required ....................... Subscription required Existing
Shovel (hydraulic) ....................... Subscription required ....................... Subscription required Existing
Shovel (hydraulic) ....................... Subscription required ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed
Truck (haul) ....................... Subscription required 150 tons ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required Proposed
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 2, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 2, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 3, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 2, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 2, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 2, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 2, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 2, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 2, 2023
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2022
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 2023
Corporate Presentation 2022
Form 10-K 2022
................................... Subscription required 2021
................................... 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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