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Rochester Mine

Plant in Pershing county in Nevada, United States with commodities Gold, Silver
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Mineral rights holdings
  13. Land status
  14. Ownership information
  15. Production statistics
  16. Reserves and resources
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. Reporter information

Geologic information

Identification information

Deposit ID 10247172
MRDS ID M060371
MAS/MILS ID 0320270673
Record type Site
Current site name Rochester Mine
Alternate or previous names Nenzel Hill, Silver State, Rochester Canyon Tungsten, Rochester, Rochester Mines 0320270324, Coeur-Rochester, Coeur-Rochester Open Pit, Rochester Group Mine, Rochester Merger Mines 0320270658, Rochester Canyon Placer Gold
Related records 10042547, 10150157, 10310354

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -118.15017, 40.2896 (WGS84)
Elevation 1829
Location accuracy 500(meters)

Site location context

Political divisions (FIPS codes)

Pershing(county)

Nevada(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Rochester(quadrangle 1:24,000 scale)

Lovelock(quadrangle 1:100,000 scale)

Lovelock(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Dixie Valley(hydrologic unit)

Central Nevada Desert Basins(hydrologic accounting unit)

Central Nevada Desert Basins(hydrologic subregion)

Great Basin(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management NV)

Bureau of Land Management NV BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States Nevada Pershing

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 028 N 034 E 16 SESESE Nevada

Commodities

Commodity Importance
Gold Secondary
Silver Primary

Materials information

Materials Type of material
Acanthite Unknown
Argentite Unknown
Arsenopyrite Unknown
Cerargyrite Unknown
Chalcopyrite Unknown
Electrum Unknown
Iron Oxides-Hydrated Unknown
Pyrargyrite Unknown
Pyrite Unknown
Quartz Unknown
Sericite Unknown
Silver Unknown
Sphalerite Unknown
Stromeyerite Unknown
Tetrahedrite Unknown

Nearby scientific data

Ore Body (1) Alluvium, undifferentiated
ListMap

Economic information

Ore body information

  • Thickness 100M
    Length 1150M
    Width 750M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 STOCKWORK
    Shape of Orebody #2 IRREGULAR
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control FAULTING
    Secondary Ore Control FRACTURING
    Type of Wallrock Alter. #1 SILICIFICATION
    Type of Wallrock Alter. #2 PYRITIZATION
    Type of Wallrock Alter. #3 SERICITIC
    Date of Last Modification 850828

Comments on the geologic information

  • GENERAL SIZE OF ORE BODY IS MEDIUM. THE ORE BODY STRIKES TO THE NE. THE THICKNESS VARIES FROM 0 TO +200 METERS. MINERAL ZONE DIMENSIONS REPRESENT DISSEMINATED AG GRADES OF MORE THAN 34 G/MT (1 OZ/T) AG. TOTAL AREA COVERED IS ABOUT 10,000 ACRES (4070 HTAC)
  • THE KOIPATO GROUP CONSISTS OF ROCKS FROM THE WEAVER ROCHESTER AND LIMERICK FORMATIONS WITH AGES FROM PERMIAN- TRIASSIC. LROCK 1101 IS A RHYOLITE TUFF.

Economic information about the deposit and operations

Operation type Surface
Development status Plant
Commodity type Metallic
Deposit size Large
Significant Yes
Discovery year 1860
Mining method Open Pit
Year of first production 1905
Plant type Leach
Plant subcategory Solvent Extraction-Electrowin
Milling method Leach-Solvent-Extract-Electrowin

Comments on exploration

  • FROM 1969-82 ASARCO REPORTEDLY SPENT 2.9 MILLION DOLLARS IN EXPLORATION COSTS ON THE PROPERTY. WORK IN 1984 INCLUDED LARGE-SCALE HEAP LEACH TESTING AND ABOUT 1800 METER OF CORE DRILLING. IN 1984 DRILLING EXPANDED THE TOTAL MINERALIZED ZONE TO 102.1 MILLION MT. COEUR ENTERED INTO A 3-R LEASE OPTION AGREEMENT WITH THE RIGHT TO EXPLORE AND BUY THE ADJACENT NEVADA PACKARD PROPERTY, WHICH HAS A GEOLOGIC STRUCTURE VERY SIMILAR TO ROCHESTER. THE PROPERTY INCLUDES 35 CLAIMS AND ABOUT 1200 ACRES. A 22,000 FT DRILL PROGRAM SCHEDULED TO START 8/96. (PRESS RELEASE, 8/14/96)

Mining district

District name Rochester

Mineral rights holdings

Type of mineral rights Located Claim
Type of mineral rights Patented
Type of mineral rights Other

Land status

Ownership category Mixed

Ownership information

  • Type Owner
    Owner Coeur D'Alene Mines Corp.
    Interest 100
    Home office Idaho
    Year 1996
    First year 1983
  • Type Operator
    Owner Coeur-Precious Metals Co.
    Home office Nevada
    Year 1996
    First year 1996
  • Type Operator
    Owner Coeur-Rochester, Inc.
    Home office Nevada
    Year 1995
    Last year 1995
  • Type Owner
    Owner Asarco (American Smelting And Refining Co.)
    Interest 100
    Year 1996
    Last year 1997
  • Type Owner
    Owner Royal Apex Silver Inc. (See Comments)
    Interest 100
    Home office Idaho
    Year 1983

Production statistics

  • Year 1991
    Description Ore Processed 6336085 Mt
  • Year 1991
    Description Gold Produced 60565 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Gold Gold 1883782.32g
  • Year 1991
    Description Silver Produced 5700000 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 177289841.7g
  • Year 1992
    Description Gold Produced 56562 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Gold Gold 1759275.09g
  • Year 1992
    Description Silver Produced 5431369 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 168934482.49g
  • Year 1992
    Description Ore Processed 6673556 Mt
  • Year 1993
    Description Ore Processed 6574869 Mt
  • Year 1993
    Description Gold Produced 66412 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Gold Gold 2065644.38g
  • Year 1993
    Description Silver Produced 5943894 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 184875794.09g
  • Year 1994
    Description Ore Processed 7039424 Mt
  • Year 1994
    Description Gold Produced 56886 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Gold Gold 1769352.62g
  • Year 1994
    Description Silver Produced 5937770 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 184685316.37g
  • Year 1995
    Description Ore Processed 7478476 Mt
  • Year 1995
    Description Gold Production 59307 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Gold Gold 1844654.14g
  • Year 1995
    Description Silver Production 6481825 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 201607320.73g
  • Year 1996
    Description Ore Processed 7375400 Mt
  • Year 1996
    Description Gold Production 74293 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Minor Gold Gold 2310770.91g
  • Year 1996
    Description Silver Production 6251180 Tr Oz/Yr
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Silver Silver 194433458.35g

Reserves and resources

  • Type In-situ
    Estimate year 1979
    Total resources 68000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 85.7 g/mt Silver Major 1979
  • Type In-situ
    Estimate year 1980
    Indicated 63500000mt ore
    Demonstrated 63500000mt ore
    Inferred 27200000mt ore
    Total resources 90700000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 47.66 g/mt Silver Major 1980
  • Type In-situ
    Estimate year 1983
    Indicated 80999999mt ore
    Demonstrated 80999999mt ore
    Total resources 80999999mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 51.43 g/mt Silver Major 1983
    Gold Au 0.24 g/mt Gold Minor 1983
  • Type In-situ
    Estimate year 1995
    Demonstrated 68038856mt ore
    Total resources 68038856mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 45.2571 g/mt Silver Major 1995
    Gold Au 0.3839 g/mt Gold Minor 1995
  • Type In-situ
    Estimate year 1996
    Demonstrated 73209809mt ore
    Total resources 73209809mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 43.1657 g/mt Silver Major 1996
    Gold Au 0.3703 g/mt Gold Minor 1996
  • Type In-situ
    Estimate year 1996
    Measured 68855000mt ore
    Demonstrated 68855000mt ore
    Total resources 68855000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 41.1429 g/mt Silver Major 1996
    Gold Au 0.3497 g/mt Gold Minor 1996
  • Type In-situ
    Estimate year 1997
    Demonstrated 65150000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 38.4 g/mt Silver Major 1997
    Gold Au 0.33 g/mt Gold Minor 1997
  • Type In-situ
    Estimate year 1997
    Inferred 9021000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 38.1 g/mt Silver Major 1997
    Gold Au 0.24 g/mt Gold Minor 1997
  • Type In-situ
    Estimate year 1997
    Demonstrated 65150000mt ore
    Inferred 9021000mt ore
    Total resources 74171000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 38.4 g/mt Silver Major 1997
    Gold Au 0.32 g/mt Gold Minor 1997

Comments on the reserve resource information

  • CAPACITY ESTIMATED FROM 1995 PRODUCTION OF 7,480,589 MT.
  • GOLD ASSAY GRADE WAS NOT PUBLISHED. VALUES OF SILVER AND GOLD FROM ONE SOURCE DOCUMENT WERE REPORTED AS CONTAINING LOW-GRADE SILVER MINERALIZATION AND MINOR GOLD VALUES. REC 5 ALSO LISTED AS JAN. 1, 1995 (1996) PROVEN + PROBABLE RESERVES IN "R" REFERENCE 033. 1996 1OK: ESTIMATED RECOVERY RATES ARE 55% FOR AG AND 85% FOR AU.

Workings at the site

  • Type of workings Surface
    Area 3240HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ACTUAL
    Mining Method OPEN PIT
    Swell Factor .65
    Percent Waste Rock 50
    Hardness of Ore M-HARD ROCKS
    Avg. Bench Height (meters) 6
    Max. Pit Slope (degrees) 45
    Capacity 13600
    Capacity Units MT ORE/DAY
    Unit Production Cost 2.27
    Units of Production $/MT ORE
    Operating Days per Year 360
    Operating Shifts per Day 2
    Year of Information 1989

Comments on the workings information

  • VALLEY FILL HEAP LEACH. CRUSH TO 1/2 AT 18,500 TPH, LEACH WITH 1.5 LB/TON SOLUTION USING DRIP LINE APPLICATION. AG AND AU ARE RECOVERED USING MERRILL-CROWE SYSTEM. PRESENT EMPLOYMENT IS 300.

Reference information

Bibliographic references

  • Production

    PRODUCTION; FROM COEUR D'ALENE MINES CORP. 1996 FORM 10-K,

  • Production

    P6.

  • Reserve-Resource

    MINING ENGINEERING. 1978 ANNUAL REVIEW. NEVADA. V. 31,

  • Reserve-Resource

    NO. 5.

  • Reserve-Resource

    VIKRE, P. G. GEOLOGY AND SILVER MINERALIZATION OF THE

  • Reserve-Resource

    ROCHESTER DISTRICT, PERSHING COUNTY, NEVADA. PH.D.

  • Reserve-Resource

    DISS., STANFORD UNIV., STANFORD, CA, 1977-78, 404 PP.

  • Reserve-Resource

    ENGINEERING AND MINING JOURNAL. EXPLORATION ROUNDUP.

  • Reserve-Resource

    ONGOING PROJECTS: U.S. - ASARCO, INC. V. 181, NO. 1,

  • Reserve-Resource

    1980, P. 170.

  • Reserve-Resource

    BONHAM, H. F., JR. RESERVES, HOST ROCKS, AND AGES OF

  • Reserve-Resource

    BULK-MINEABLE PRECIOUS METAL DEPOSITS IN NEVADA. NV BUR.

  • Reserve-Resource

    MINES AND GEOL. OFR 82-9, 1982, 4 PP.

  • Reserve-Resource

    ANNUAL REPORT, 1983, COEUR D'ALENE MINES CORPORATION, P6.

  • Reserve-Resource

    RANDOL MINING DIRECTORY, 1994/95, U.S. MINES & MINING

  • Reserve-Resource

    COMPANIES, PP. 345, 346.

  • Reserve-Resource

    RANDOL MINING DIRECTORY, 1996/97, U.S. MINES & MINING

  • Reserve-Resource

    COMPANIES, P268.

  • Reserve-Resource

    1995/96, NEVADA MINES DIRECTORY, PP. 7, 28.

  • Reserve-Resource

    AMERICAN MINES HANDBOOK, 1996, P68.

  • Reserve-Resource

    1995 ANNUAL REPORT, COEUR D'ALENE MINES CORPORATION,

  • Reserve-Resource

    PP. 24, 25.

  • Reserve-Resource

    1995 FORM 10K, COEUR D'ALENE MINES CORPORATION, PP. 3-5.

  • Reserve-Resource

    COEUR D'ALENE MINES CORPORATION, 1996 ANNUAL REPORT, P13 &

  • Reserve-Resource

    FORM 10-K REPORT, P5.

  • Deposit

    CAMERON, E. N. GEOLOGY AND MINERALIZATION OF THE

  • Deposit

    NORTHEASTERN HUMBOLDT RANGE, NEVADA. GEOL. SOC. AM.

  • Deposit

    BULL., V. 50, 1939, PP. 563-634.

  • Deposit

    COEUR D'ALENE MINES CORPORATION PRESS RELEASE, DECEMBER 19,

  • Deposit

    1983, 1 P.

  • Deposit

    JENNEY, C. P. GEOLOGY OF THE CENTRAL HUMBOLDT RANGE,

  • Deposit

    NEVADA. NV BUREAU OF MINES AND GEOL. BULL 24, 1935, 73 PP.

  • Deposit

    JOHNSON, M. G. GEOLOGY AND MINERAL DEPOSITS OF PERSHING

  • Deposit

    COUNTY, NEVADA. NEVADA BUREAU OF MINES AND GEOLOGY

  • Deposit

    BULLETIN 89, 1977, 115 PP.

  • Deposit

    KOFP, A. GEOLOGY AND ORE DEPOSITS OF THE ROCHESTER

  • Deposit

    DISTRICT, NEVADA. U.S. GEOL. SURV. BULL. 762, 1924,

  • Deposit

    PP. 78.

  • Deposit

    SCHRADER, F. C. THE ROCHESTER MINING DISTRICT, NEVADA,

  • Deposit

    U.S. GEOL. SURV. BULL. 580-M, 1914, PP. 325-273.

  • Deposit

    SLAVIK, G. (ED.). PINSON MINE, FLORIDA CANYON DESOSIT,

  • Deposit

    ROCHESTER DISTRICT, AND RELIEF CANYON DEPOSIT. GEOL.

  • Deposit

    SOC. NV 1984 MEETING, FIELD TRIP, AND ROAD LOG,

  • Deposit

    SEPT. 21-23, 1984, RENO, NV, 68 PP.

  • Deposit

    VIKRE, P. G. SILVER MINERALIZATION IN THE ROCHESTER

  • Deposit

    DISTRICT, PERSHING COUNTY, NEVADA. ECON. GEOL. AND BULL.

  • Deposit

    SOC. ECON. GEOL., V. 76, NO. 3, 1981, PP. 580-609.

  • Deposit

    WALLACE, R. E., D. B. TATLOCK, N. J. SIBERLING, AND

  • Deposit

    W. P. IRWIN. GEOLOGIC MAP OF THE UNIONVILLE QUADRANGLE,

  • Deposit

    PERSHING COUNTY, NEVADA. U.S. GEOL. SURV. QUAD. MAP

  • Deposit

    GQ-820, 1969, SCALE 1:62,500.

  • Deposit

    WATSON, B. N. LARGE LOW GRADE SILVER DEPOSITS IN NORTH

  • Deposit

    AMERICA. WORLD MIN., V. 30, NO. 3, 1977, PP. 44-49.

  • Deposit

    WATSON, B. N. BULK TONNAGE, LOW-GRADE SILVER DEPOSITS -

  • Deposit

    UPDATE 1980. NV BUREAU OF MINES AND GEOL. REP. 36, 1983,

  • Deposit

    PP. 36-41.

  • Deposit

    NEV. BUREAU OF MINES AND GEOLOGY SPECIAL PUBLICATION 10, 1990,

  • Deposit

    P. 8.

  • Deposit

    VIKRE, P. G. SILVER MINERALIZATION IN THE ROCHESTER DISTRICT

  • Deposit

    PERSHING COUNTY, NEVADA, ECONOMIC GEOLOGY, V76, 1981, PP.

  • Deposit

    580 - 609.

  • Deposit

    COEUR D'ALENE MINES CORPORATION, "ROCHESTER", FOLDER.

  • Deposit

    RECONNAISSANCE OF MINING DISTRICTS IN PERSHING COUNTY, NV.

  • Deposit

    U.S. BUREAU OF MINES IC 6902, 1936, 58 PP.

  • Deposit

    ROCHESTER - NEVADA'S NEWEST AND LARGEST PRECIOUS METAL

  • Deposit

    PROJECT, AIME PREPRINT, 87-44, 1987, 6 PP.

  • Deposit

    ROCKY MOUNTAIN PAYDIRT, DEC. 1986, PP. 4A - 6A.

  • Deposit

    ROCKY MOUNTAIN PAYDIRT, MARCH 1989, P 11A.

  • Deposit

    ANNUAL REPORT, 1986, COEUR D'ALENE MINES CORP, PP. 6, 28.

  • Deposit

    ANNUAL REPORT, 1987, COEUR D'ALENE MINES CORP, P32.

  • Deposit

    ANNUAL REPORT, 1988, COEUR D'ALENE MINES CORP, P32.

  • Deposit

    1986 FORM 10K COEUR D'ALENE MINES CORP. P21

  • Deposit

    1987 FORM 10K COEUR D'ALENE MINES CORP. P22

  • Deposit

    1988 FORM 10K COEUR D'ALENE MINES CORP. P23

  • Deposit

    EM-KAYAN, MORRISON-KNUDSEN, DEC., 1986.

  • Deposit

    NEVADA MINING ASSOC., NOV-DEC, 1986, P17.

  • Deposit

    FIRST QUARTER FORM 10Q, 1989, COEUR D'ALENE MINES CORP. P14.

  • Deposit

    SECOND QUARTER FORM 10Q, 1989, COEUR D'ALENE MINES CORP P12.

  • Deposit

    THE MINING RECORD, VOL 107, #34, AUG. 21, 1996, P5.

  • Deposit

    THE MINING RECORD, VOL 107, #??, AUG. 31, 1996, P5.

Reporter information

Type Date Name Affiliation Comment
Reporter 08-OCT-1997 Clarke, Donald U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Current status (per MSHA)

StatusActive since 10/21/1985
MSHA mine ID2601941
Mine name (MSHA)Rochester Mine
Current operatorCoeur Rochester, Inc.
Current controller (parent)Coeur Mining, Inc.
Mine typeSurface (Metal / non-metal)

Inferred by coordinate + name similarity (617 m, 1.00 match). Confirm against MSHA if precision matters — non-USGS-curated cross-references may occasionally point at a neighbouring mine.

Open MSHA's Mine Data Retrieval System for inspections, accidents, and violations for this mine.

Operator history (post-MRDS)

MRDS records operators as of each record's last update (≤ 2019). Some of the operators listed here have since changed hands or dissolved:

  • Asarco (American Smelting And Refining Co.) — acquired by Asarco LLC, subsidiary of Grupo México (2009)
    American Smelting and Refining Co. Filed Chapter 11 in 2005; acquired out of bankruptcy by Grupo México in 2009.

Curated by qvyshift.com from publicly-reported M&A activity (SEC filings, press releases, USGS Mineral Yearbooks). Not authoritative — verify against primary sources before relying on it. The MSHA panel above is the current authoritative source for actively-permitted mines.

External references

Maps centered on this site

Authoritative Nevada resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.