Hoff Mine

Past Producer in El Dorado county in California, United States with commodities Chromium, Iron
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. Links to other databases
  15. Bibliographic references
  16. Reporter information

Geologic information

Identification information

Deposit ID 10162874
MRDS ID M007659
MAS/MILS ID 0060170244
Record type Site
Current site name Hoff Mine
Alternate or previous names Trio Chrome Company Lease, Trio Chrome Company Leases
Related records 10029853

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -120.92242, 38.5227 (WGS84)
Elevation 2624
Location accuracy 500(meters)

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Latrobe(quadrangle 1:24,000 scale)

Placerville(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Cosumnes(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 El Dorado

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 008 N 010 E 30 W2 California

Commodities

Commodity Importance
Chromium Critical Tertiary
Iron Tertiary

Materials information

Materials Type of material
Chromite Unknown
Penninite Unknown
Serpentine Unknown

Nearby scientific data

Ore Body (1) -120.92242, 38.5227

Economic information

Ore body information

  • Strike N60W
    Dip 70N
    Thickness 3M
    Length 19M
    Width 0M
    Depth to top 99999M
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 LENTICULAR
    Primary mode of Origin MAGMATIC DIFFER
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONITIZATION
    Strike And Dip N60W:70N
    Minimum Depth to Top 99999
    Avg. Thick. Unconsol. Mat. 9999
    Min. Thick. Unconsol. Mat. 9999
    Date of Last Modification 820414

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Metallic
Significant No

Mining district

District name Latrobe District

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Robert Haddock And R. H. Chaix
    Home office California
    Year 1976
  • Type Operator
    Owner Trio Chrome Co.-Lease From Haddock And Chaix
    Home office California
    Year 1976

Comments on the production information

  • ACCORDING TO TALIAFERRO AND BRADLEY,ABOUT 200 LONG TONS WERE PRODUCED DURING W.W.1,BUT FEDERAL RECORDS LIST ONLY 107 LONG TONS. THE AVERAGE MINEABLE GRADE OF CHROMITE IS 28 TO 33 PERCENT. INSUFFICIENT DATA FOR MATRIX CALCULATIONS.

Reference information

Bibliographic references

  • Deposit

    CATER,F.W. ET AL,CAL.DIV MINES CHROMITE INVEST,BULL 134,PT.3

  • Deposit

    P.120-121,1951

  • Deposit

    BRADLEY,W.W. ET AL,1918 CAL. STATE MINING BUR BULL 76,P.135-

  • Deposit

    MINERAL PROPERTY FILE NO.15.96

Reporter information

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

Beyond USGS

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

Authoritative California resources

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