1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Mc Laughlin Mine

Plant in Napa county in California, United States with commodities Gold, Silver
Map
XML
JSON
KML
B
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. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10116286
MRDS ID W700452
MAS/MILS ID 0060550134
Record type Site
Current site name Mc Laughlin Mine
Alternate or previous names Manhattan, Mclaughlin Mine and Plant, One Shot
Related records 10085020

Geographic coordinates

Point of reference Pit
Geographic coordinates: -122.35796, 38.83568 (WGS84)
Elevation 634
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Napa(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Knoxville(quadrangle 1:24,000 scale)

Healdsburg(quadrangle 1:100,000 scale)

Santa Rosa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Napa

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 011 N 005 W 01 NE California

Commodities

Commodity Importance
Gold Primary
Silver Secondary

Materials information

Materials Type of material
Gold Unknown
Mercury Unknown
Silver Unknown

Nearby scientific data

Pit (1) -122.35796, 38.83568
ListMap

Economic information

Ore body information

  • Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 BRECCIA FILL
    Shape of Orebody #2 LENTICULAR
    Type of Orebody #3 DISSEMINATED
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control FOLDING
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 UNKNOWN
    Date of Last Modification 831230
  • Area 3640HA
    Field Value
    Total Surface Area (HA) 3640
    Date of Last Modification 910418

Economic information about the deposit and operations

Operation type Surface
Development status Plant
Commodity type Metallic
Deposit size Large
Significant Yes
Discovery year 1979
Mining method Open Pit
Year of first production 1985
Plant type Leach
Plant subcategory Hydromet
Milling method Autoclave-Carbon-In-Pulp-Electrowin

Mining district

District name Knoxville

Mineral rights holdings

Type of mineral rights Located Claim
Type of mineral rights Fee Ownership
Type of mineral rights Private Lease

Land status

Ownership category BLM Administrative Area

Ownership information

  • Type Owner-Operator
    Owner Homestake Mining Co.
    ID 404462
    Interest 100
    Home office South Dakota
    Year 1995

Comments on the ownership information

  • HOMESTAKE ACQUIRED THE MANHATTAN MINE PROPERTY (AN OLD MERCURY PRODUCER), FROM BILL WILDER, THE MINE OPERATOR, AND BOB HOFFMAN, ANOTHER MAJOR LAND HOLDER; BOTH MEN RETAIN A ROYALTY INTEREST.

Production statistics

  • Year 1985
    Description Ore Processed 599000 Metric Tonnes
  • Year 1985
    Description Gold Recovered 2613 Kilograms
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 2613000g
  • Year 1986
    Description Ore Processed 927000 Metric Tonnes
  • Year 1986
    Description Ore Feed Grade 6 Grams Per Metric Tonne
  • Year 1986
    Description Gold Recovered 5381 Kilograms
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 5381000g
  • Year 1990
    Description Gold Production 267013 Tr Oz/Yr
  • Year 1991
    Description Gold Productiom 262719 Tr Oz/Yr
  • Year 1992
    Description Gold Production 291094 Tr Oz/Yr
  • Year 1993
    Description Gold Production 305312 Tr Oz/Yr
  • Year 1994
    Description Ore Mined 2419461 Mt/Yr
  • Year 1994
    Description Gold Production 250000 Tr Oz/Yr
  • Year 1995
    Description Ore Processed @ 0.120 Oz/T 2056000 St Ore
  • Year 1995
    Description Gold Production 242000 Tr Oz/Yr
  • Year 1996
    Description Gold Production 826000 Tr Oz/Yr
  • Year 1996
    Description Ore Processed @ 0.096 Oz/St 2485000 St Ore

Reserves and resources

  • Type In-situ
    Estimate year 1986
    Demonstrated 16296000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.73 g/mt Gold Major 1986
  • Type In-situ
    Estimate year 1994
    Demonstrated 20000000mt ore
    Total resources 20000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 2.85 g/mt Gold Major 1994
  • Type In-situ
    Estimate year 1995
    Demonstrated 20000000mt ore
    Total resources 20000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 2.57 g/mt Gold Major 1995
  • Type In-situ
    Estimate year 1997
    Demonstrated 15084000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 2.16 g/mt Gold Major 1997

Comments on the reserve resource information

  • RESERVE COLUMN 2 INDICATES COMPANY INFORMATION FROM HOMESTAKES 1985 ANNUAL REPORT.
  • AS OF MID 1996 MINING WILL CEASE, THE PRESSURE OXIDATION CIRCUIT WILL SHUT DOWN: FUTURE GOLD PRODUCTION WILL COME FROM PROCESSING LOW GRADE ORE STOCKPILES WHICH IS EXPECTED TO LAST FOR EIGHT YEARS. THE MILL SULFIDE CIRCUITS WILL BE CONVERTED TO CONVENTIONAL DIRECT CYANIDE LEACH FOR PROCESSING THIS ORE. STOCKPILE ORE AS OF 12/31/96; DATA NOT ENTERED IN RESOURCES TABLE.
  • MATRIX 1 COLUMN 2 INDICATES COMPANY INFORMATION FROM HOMESTAKES 1985 ANNUAL REPORT.

Workings at the site

  • Type of workings Surface
    Area 3640HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method OPEN PIT
    Percent Waste Rock 99.9
    Primary Material Cover M-HARD ROCKS
    Hardness of Ore M-HARD ROCKS
    Avg. Bench Height (meters) 6.1
    Capacity 2720
    Capacity Units MT ORE/DAY
    Preprod. Stripping Vol. 8200
    Unit Production Cost 8.31
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 3
    Year of Information 1983

Comments on other economic factors

  • MINING OPERATION CEASED ON JUNE 27 1996: AUTOCLAVES WERE DECOMMISSIONED ON JUNE 28, 96, STOCKPILE WILL BE LEACHED FOR 7 MORE YEARS AT APPROX 120,000 T OZ/YR GOLD PRODUCTION.
  • AUTOCLAVES WERE DECOMMISSIONED ON JUNE 28, 1996.

Reference information

Bibliographic references

  • Production

    HOMESTAKE MINING CO., 1996 FORM 10-K REPORT, P8.

  • Production

    HOMESTAKE MINING CO., 1996 ANNUAL REPORT, PP. 18-19.

  • Reserve-Resource

    HOMESTAKE MINING CO., 1986 ANNUAL REPORT, P.11,12.

  • Reserve-Resource

    HOMESTAKE MINING CO., 1994 ANNUAL REPORT, PP. 20-22.

  • Reserve-Resource

    HOMESTAKE MINING CO., 1994 FORM 10-K REPORT, PP. 6-8.

  • Reserve-Resource

    HOMESTAKE MINING CO., 1995 ANNUAL REPORT:

  • Reserve-Resource

    HOMESTAKE MINING CO., 1996 ANNUAL REPORT, PP. 18-19, &

  • Deposit

    MSHA RPT DATED DEC 1980.

  • Deposit

    SEE MSHA NO. 0404568

  • Deposit

    HOMESTAKE MINING CO., FACT SHEET, 8/27/80, 3PP.

  • Deposit

    BIG SKY PAY DIRT, 3/84, P.24A.

  • Deposit

    MINING JOURNAL, 4/20/84, P.271.

  • Deposit

    MINING JOURNAL, 2/24/84, P.126.

  • Deposit

    INTERMOUNTAIN PAY DIRT, 5/84, P.3A,4A.

  • Deposit

    METALS WEEK, 3/4/85, P.9.

  • Deposit

    SKILLINGS', 5/25/85, P.15.

  • Deposit

    MINING RECORD, 6/19/85, P.10.

  • Deposit

    MINING JOURNAL, V 305/N 7841, 11/29/85, P.408,409,419.

  • Deposit

    ARGALL, GEORGE O., JR., PERSEVERANCE AND WINNING WAYS AT

  • Deposit

    MCLAUGHLIN GOLD, ENGINEERING AND MINING JOURNAL, 10/86,

  • Deposit

    P.26-32.

  • Deposit

    HOMESTAKE MINING CO., 1985 ANNUAL REPORT, P.11,12.

  • Deposit

    HOMESTAKE MINING CO., MCLAUGHLIN MINE - GENERAL INFORMATION

  • Deposit

    SUMMARY, CIRCA 1988, 14PP.

  • Deposit

    HOMESTAKE MINING CO., PROSPECTUS - OFFER TO PURCHASE,

  • Deposit

    6/15/92, PP. 68-71.

  • Deposit

    SKILLINGS', V 79/N 14, 4/7/90, P.25.

  • Deposit

    HOMESTAKE MINING CO. 1981 ANNUAL REPORT.

  • Deposit

    MINING RECORD, V 106/N 11, 3/15/95, P.3.

  • Deposit

    RANDOL MINING DIRECTORY 1993/94, P.174.

  • Deposit

    RANDOL MINING DIRECTORY 1994/95, P.233.

  • Deposit

    IC-8252, 1965.

  • Deposit

    CALIF. DIV. MINES AND GEOL. SPECIAL PUBLICATION 103, 1990.

  • Deposit

    SKILLINGS' MINING REVIEW. HOMESTAKE PROCEDEDING WITH ITS MC-

  • Deposit

    LAUGHLIN GOLD PROJECT. JAN 22, 1983, PP. 3-6.

  • Deposit

    THE MINING RECORD, V. 107, N34, AUG. 21, 1996, P14.

  • Deposit

    HOMESTAKE MINING CO. 1982 ANNUAL REPORT.

  • Deposit

    HOMESTAKE MINING CO. FORM 10-K, 1982.

  • Deposit

    THE MINING RECORD. MINING FIRMS SEEKING OPEN PIT GOLD PRO-

  • Deposit

    PERTIES. WED., JAN. 5, 1983, P. 9.

  • Deposit

    MINING ENGINEERING. U.S. AND INTERNATIONAL MINERAL NEWS

  • Deposit

    BRIEFS-UNITED STATES-HOMESTAKE MINING CO. AUGUST, 1982,

  • Deposit

    P. 1210.

  • Deposit

    AMERICAN METALS MARKET. JUNE 11, 1982, PP. 1,8

  • Deposit

    THE MINING RECORDS. HOMESTAKE IS THE NATIONS LEADING GOLD

  • Deposit

    PRODUCER. WED., FEB. 25, 1981.

  • Deposit

    THE MINING RECORD. CALIFORNIA MINERS READY FOR SECOND GOLD

  • Deposit

    BOOM. WED., JUNE 10, 1981, P. 7.

  • Deposit

    THE MINING RECORD. HOMESTAKE TRIPLES ESTIMATE OF CALIFORINA

  • Deposit

    GOLD FIND. WED. MAY 20, 1981, P. 1.

  • Deposit

    SKILLINGS' MINING REVIEW. APR. 17, 1982, P. 13.

  • Deposit

    MINING CONGRESS JOURNAL. DISCOVERY OF SIGNIFICANT GOLD MIN-

  • Deposit

    ERALIZATION. OCT 1980.

  • Deposit

    WORLD MINING. NORTHERN CALIFORNIA GOLD STILL BEING DISCOV-

  • Deposit

    MINING JOURNAL, V 314/N 8065, 4/6/90, P.273.

  • Deposit

    ERED. JULY 1981, P. 27.

  • Deposit

    NORTHERN MINER, V 79/N 36, 11/8/93, P.15.

  • Deposit

    SHUCK, D., OLSON, B., AND SMITH, R., BULK SULFIDE FLOTATION

  • Deposit

    OF LOW-GRADE REFRACTORY ORES AT HOMESTAKE'S MCLAUGHLIN

  • Deposit

    MINE, PREPRINT NO. 94-143, PRESENTED AT SME ANNUAL MEETING

  • Deposit

    FEB. 14-17, 1994, 5PP.

  • Deposit

    MINING CONGRESS JOURNAL. JULY 1981.

  • Deposit

    MINING CONGRESS JOURNAL. PAYOFF CAME WITHIN FIRST TWO YEARS

  • Deposit

    OF PROGRAM. JAN. 1982, P. 58.

  • Deposit

    THE MINING RECORD. HOMESTAKE REPORTS EARNINGS. WED., JUNE

  • Deposit

    16, 1982.

  • Deposit

    ENGINEERING AND MINING JOURNAL. HOIMESTAKE PLANS OPEN-PIT

  • Deposit

    GOLD MINE AT MCLAUGHLIN MINE. OCT. 1982, P. 9.

  • Deposit

    WORLD MINING. MCLAUGHLIN GOLD PERMITS SOUGHT. JUNE 1982,P87.

  • Deposit

    THE MINING RECORD. HOMESTAKE MINING REPORTS ON FINANCES AND

  • Deposit

    ACTIVITIES. WED., MAY 11, 1983.

  • Deposit

    CALIFORNIA MINING JOURNAL. HOMESTAKE MINING TRIPLES ESTIMATE

  • Deposit

    OF CALIFORNIA GOLD FIND. JULY 1981, P. 14,16

  • Deposit

    U.S. BUREAU OF MINES. MERCURY POTENTIAL OF THE UNITED STATES

  • Deposit

    KE MINING CO., 1994 FORM 10-K REPORT, PP. 6-8.

General comments

Subject category Comment text
Deposit MSHA LOCAT: APPROX 14 MILES EAST OF LOWER LAKE, CA ON MORGAN VALLEY RD. FIRST GOLD WAS POURED ON MARCH 5, 1985. CAPACITY WAS INCREASED TO DESIGN BY EARLY IN 1986, MINING CEASED IN JUNE 27, 1996. AUTOCLAVES DECOMMISSIONED ON JUNE 28, 1996. STOCKPILE WILL BE LEACHED FOR AN OTHER 7 YEARS AT 120,000 T OZ PER YEAR GOLD.

Reporter information

Type Date Name Affiliation Comment
Reporter 22-SEP-97 Buckingham, David A. 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)

StatusAbandoned since 05/05/2003
MSHA mine ID0404462
Mine name (MSHA)McLaughlin Mine
Current operatorHomestake Mining Company of California
Current controller (parent)Barrick Gold Corp
Mine typeSurface (Metal / non-metal)

MSHA cross-reference per the original MRDS record. Mine status and operator reflect MSHA's last published Mines export (February 2025); MSHA's public bulk feed has been unavailable since, so this may be out of date. See the Mine Data Retrieval System for current status.

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:

  • Homestake Mining Co. — acquired by Subsidiary of Barrick Gold (2001)
    Operator of the historic Homestake Mine in South Dakota; acquired by Barrick Gold in 2001.

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 California resources

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