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Holbrook and Mcguire Mine

Past Producer in Calaveras county in California, United States with commodities Chromium, Iron
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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. Land status
  13. Ownership information
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10187077
MRDS ID M004639
MAS/MILS ID 0060090560
Record type Site
Current site name Holbrook and Mcguire Mine
Alternate or previous names Holbrook and Mcguire Group, High Grade Workings, Low Grade Workings

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -120.5641, 37.96021 (WGS84)
Elevation 396
Location accuracy 10(meters)

Site location context

Political divisions (FIPS codes)

Calaveras(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

New Melones Dam(quadrangle 1:24,000 scale)

Oakdale(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Stanislaus(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management CA)

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

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States California Calaveras

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 001 N 013 E 08 N2NENE California

Commodities

Commodity Importance
Chromium Critical Tertiary
Iron Tertiary

Materials information

Materials Type of material
Chromite Unknown
Magnesite Unknown
Serpentine Unknown

Nearby scientific data

Main Entrance (1) -120.5641, 37.96021
ListMap

Economic information

Ore body information

  • Strike N50W
    Dip 80E
    Thickness 0M
    Length 45M
    Width 2M
    Area 2HA
    Depth to top 0M
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 OTHER
    Shape of Orebody #2 LENTICULAR
    Shape of Orebody #3 OTHER
    Primary mode of Origin MAGMATIC DIFFER
    Secondary mode of Origin OTHER
    Primary Ore Control LITHOLOGY
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONITIZATION
    Strike And Dip N50W:80E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 2
    Date of Last Modification 830316

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1890
Year of first production 1918

Mining district

District name Carson Hill

Land status

Ownership category Federal

Ownership information

  • Type Owner
    Owner Dunbar, Allan - Last Operator
    Home office California
    Year 1976
    First year 1942
  • Type Owner
    Owner U.S. Bureau Of Land Management - Sacramento Office
    Interest 100
    Home office California
    Year 1976

Comments on the production information

  • PRODUCTION TO 1918,600 TONS 40-48% CR2O3, 250 TONS AFTER 191 850 TONS. U.SBM ASSAY-SAMPLE#T- 1761,USBM#71811 YIELDED 38. 3 LAND OWNED BY BUREAU OF LAND MANAGEMENT,SACRAMENTO,CAL. ORE EXPOSED IN LOW GRADE WORKINGSMAY CONTAIN UP TO 600 TONS, GS GRADE ORE INADEQUATE RESOURCE FOR COST ANALYSIS ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES-MASSIVE 2 03.32,CR2O3 46.60,FEO 10.61,TOTAL FE 12.07,AL203 18.89,MGO CR/FE 3.40.DISSEMINATED ORE=S102 02.50,CR2O3 46.04,FEO 11.43 FE 14.15,AL203 22.67,MGO 13.60,CR/FE 2.86.OLD MILL CONCENTRA 05.00,CR2O3 45.31,FEO 09.45,TOTALFE 19.94,AL203 16.06,MGO 09 FE=2.

Workings at the site

  • Type of workings Surface
    Area 2HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method OPEN PIT
    Swell Factor .6
    Avg. Overburden Thickness 0
    Primary Material Cover M-HARD ROCKS
    Percentage 100
    Hardness of Ore M-HARD ROCKS
    Capacity Units MT ORE/DAY
    Units of Production $/MT ORE
    Year of Information 1976

Reference information

Bibliographic references

  • Deposit

    CAL. DIV. MINES GEOL BULL 134,PT3CHAP 2,P.42-44,PL.5

  • Deposit

    CAL DIV MINES GEOL BULL 145,PL 2

  • Deposit

    CAL. COUNTY REPT NO.2,P.22,129,& PL.D 1962

  • Deposit

    COOP WAR MINERALS INVEST. PROJ, CALAVERAS COUNTY NO.6&7, 19

Reporter information

Type Date Name Affiliation Comment
Reporter 27-FEB-1984 Wetzel, Nicholas U.S. Bureau of Mines

Beyond USGS

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

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.