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Zaca Mine & Mill

Plant in Alpine county in California, United States with commodities Copper, Gold, Lead, Silver, Tungsten
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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. Mineral rights holdings
  12. Land status
  13. Ownership information
  14. Reserves and resources
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10211705
MRDS ID M021050
MAS/MILS ID 0060030001
Record type Site
Current site name Zaca Mine & Mill
Alternate or previous names Collosus, Zaca Mine and Mill, Advance, Tarnish
Related records 10034297

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -119.70739, 38.66601 (WGS84)
Elevation 1829
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Alpine(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Heenan Lake(quadrangle 1:24,000 scale)

Smith Valley(quadrangle 1:100,000 scale)

Walker Lake(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Carson(hydrologic unit)

Carson(hydrologic accounting unit)

Central Lahontan(hydrologic subregion)

Great Basin(hydrologic region)

Federal lands

Humboldt-Toiyabe National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California Alpine

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 010 N 021 E 31 SESE California

Commodities

Commodity Importance
Copper Tertiary
Gold Primary
Lead Tertiary
Silver Primary
Tungsten Critical Tertiary

Materials information

Materials Type of material
Argentite Unknown
Galena Unknown
Gold Unknown
Pyrite Unknown
Sphalerite Unknown

Nearby scientific data

Ore Body (1) -119.70739, 38.66601
ListMap

Economic information

Ore body information

  • Thickness 120M
    Length 125M
    Width 15M
    Depth to top 0M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 LENTICULAR
    Type of Orebody #2 STOCKWORK
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control FRACTURING
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 SERICITIC
    Type of Wallrock Alter. #2 SILICIFICATION
    Type of Wallrock Alter. #3 INTERM ARGILLIC
    Minimum Depth to Top 0
    Date of Last Modification 830902
  • Area 223HA
    Field Value
    Total Surface Area (HA) 223
    Date of Last Modification 910418

Economic information about the deposit and operations

Operation type Surface
Development status Plant
Commodity type Metallic
Deposit size Small
Significant Yes
Discovery year 1862
Mining method Bench (Berm)
Year of first production 1864
Plant type Leach
Plant subcategory Hydromet
Milling method Hydrometallurgy Unspecified

Mineral rights holdings

Type of mineral rights Located Claim

Land status

Ownership category National Forest

Ownership information

  • Type Owner-Operator
    Owner Western States Minerals Corp.
    ID 401337
    Home office Colorado
    Year 1997
  • Type Owner
    Owner Siskon Gold Corp. (Centurion Gold Ltd.)
    ID 401337
    Interest 100
    Home office Canada
    Year 1990
  • Type Operator
    Owner Western States Minerals Corp.
    Home office Colorado
    Year 1990
  • Type Owner-Operator
    Owner Atlas Corp.
    ID 401337
    Interest 50
    Year 1983
  • Type Owner
    Owner California Silver Ltd
    ID 401337
    Interest 50
    Home office Canada
    Year 1983

Reserves and resources

  • Type In-situ
    Estimate year 1987
    Indicated 9500000mt ore
    Demonstrated 9500000mt ore
    Total resources 9500000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.9947 g/mt Gold Major 1987
    Silver Ag 20.5799 g/mt Silver Major 1987
  • Type In-situ
    Estimate year 1992
    Demonstrated 8533000mt ore
    Total resources 8533000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.994 g/mt Gold Major 1992
    Silver Ag 19.54 g/mt Silver Major 1992
  • Type In-situ
    Estimate year 1996
    Demonstrated 8532979mt ore
    Total resources 8532979mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 0.994 g/mt Gold Major 1996
    Silver Ag 19.542 g/mt Silver Major 1996

Comments on the reserve resource information

  • PROPOSED DEVELOPMENT OF THIS SITE IS BASED ON DRILL INDICATED RESERVES (IN SITU) CONTAINING AN ESTIMATED 6,620,000 MT AVERAGING 1.03 GM/MT AU AND 24.0 GM/MT AG. RECOVERABLE INDICATED RESERVES USING A 20% DILUTION FACTOR ARE ESTIMATED TO BE 7,944,000 MT AT A GRADE OF 0.86 GM/MT AU AND 20.0. GM/MT AG. ALL INFRASTRUCTURE COSTS HAVE BEEN INCLUDED WITH MINE CAP TOTAL. MINE CAP IS ESTIMATED TO BE 30%, AND MILL CAP 70%. OF WORKING CAPITAL.

Workings at the site

  • Type of workings Surface
    Area 223HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method BENCH (BERM)
    Percent Waste Rock 99.9
    Avg. Overburden Thickness 0
    Hardness of Ore M-HARD ROCKS
    Capacity 2710
    Capacity Units MT ORE/DAY
    Unit Production Cost 3.27
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 1
    Year of Information 1983

Reference information

Bibliographic references

  • Reserve-Resource

    ORE RESERVE INFORMATION FROM OPERATOR, 2/2/87.

  • Reserve-Resource

    RANDOL MINING DIRECTORY, 1990.

  • Reserve-Resource

    RANDOL MINING DIRECTORY, 1996/97, P170.

  • Deposit

    MORRISON-KNUTSON CO., INC.-MINING GROUP. MINE DEPOSIT FILE

  • Deposit

    REPORT CALIFORNIA SILVER LID.-ZACA MINE, MARK LEEVILLE,

  • Deposit

    CA., FINAL REPORT. USBM CONTRACT NO. SO221028, JULY 1983.

  • Deposit

    CALIFORNIA SILVER LTD., COPORATE PROFILE, NOV. 1982.

  • Deposit

    CALIFORNIA SILVER LTD., ANNUAL REPORT. 1981.

  • Deposit

    INTERNATIONAL INVESTORS VIEWPOINT. COMPLIMENTARY INVESTMENT

  • Deposit

    NEWSLETTER. APRIL 13, 1982.

  • Deposit

    THE MINING RECORD. CALIFORNIA SILVER 1981 EXPLORATION REPORT

  • Deposit

    DEC. 16, 1981.

  • Deposit

    MINING CONGRESS JOURNAL. JOINT DEVELOPMENT SET FOR ZACA

  • Deposit

    PROPERTY. JUNE 1982. PP. 12.

  • Deposit

    MINING ENGINEERING. EXPLORATION. MAY 1983, P. 418.

  • Deposit

    ENGINEERING AND MINING JOURNAL. JAN. 1983, P. 56.

  • Deposit

    CAL ST MNG BUR RPRT NO. 17, P. 401.

  • Deposit

    18 RPRT P. 358.

  • Deposit

    CAL JMG V. 53, P. 413

  • Deposit

    USBM JMG V. 53, P. 413.

  • Deposit

    AMERICAN MINES HANDBOOK'S, 1993, 1996, 1997.

General comments

Subject category Comment text
Deposit AS OF 1996/97 PROPERTY IS UNDERGOING SOME RENEWED EXPLORATION INTEREST BY WESTERN STATES MINERALS CORP. RESOURCES LISTED IN BACK UP AT THAT TIME ARE INCLUDED IN "R" RECORD #3 AS OF END OF 1986 A NEW MINING PLAN HAD BEEN DEVELOPED WHICH WOULD USE HEAP LEACHING. STILL NOT PRODUCING AS OF 1989.

Reporter information

Type Date Name Affiliation Comment
Reporter 17-JUN-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 10/09/1981
MSHA mine ID0401337
Mine name (MSHA)Zaca Mine & Mill
Current operatorClaude B Lovestedt
Current controller (parent)Lovestedt Claude B
Mine typeUnderground (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.

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.