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Liberty Mine

Past Producer in Calaveras county in California, United States with commodities Chromium, Iron
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Geologic information

Identification information

Deposit ID 10187534
MRDS ID M004640
MAS/MILS ID 0060090561
Record type Site
Current site name Liberty Mine
Alternate or previous names Mcfall
Related records 10027953

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -120.5541, 37.95601 (WGS84)
Elevation 302
Location accuracy 10(meters)
(click for info)

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 09 NESENW California

Commodities

Commodity Importance
Chromium Tertiary
Iron Tertiary

Materials information

Materials Type of material
Asbestos Unknown
Chromite Unknown
Olivine Unknown
Pyroxene Unknown
Serpentine Unknown

Nearby scientific data

Main Entrance (1) -120.5541, 37.95601
ListMap

Ore body information

  • Area 1HA
    Field Value
    Total Surface Area (HA) 1
    Date of Last Modification 910418

Economic information

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1917
Year of first production 1917

Mining district

District name Carson Hill

Mineral rights holdings

Type of mineral rights Other

Land status

Ownership category Federal

Ownership information

  • Type Owner
    Owner California Chrome Co.-Last Operator-1918
    Home office California
    Year 1976
  • Type Owner
    Owner U.S. Bureau Of Land Management - Sacramento Office
    Interest 100
    Home office California
    Year 1976

Comments on the reserve resource information

  • NO RESERVE ESTIMATE REPORTED. 282TONS OF ORE AVERAGING 47-48 T CR2O3 PRODUCED FROM 1917-1918. MINE NOW ON BLM LAND. THE AVERAGE MINABLE GRADE OF CHROMITE IS 47.5 PERCENT. INSUFFICIENT DATA FOR MATRIX CALCULATIONS. ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES-MASSIVE 2 04.47,CR2O3 48.42,FEO 11.89,TOTAL FE 13.68,AL203 15.35,MGO CR/FE 3.12.

Workings at the site

  • Type of workings Surface
    Area 1HA
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    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
  • Type of workings Underground
    Length 59M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Mining Method OVERHAND 10-38
    Swell Factor .6
    Hardness of Rock HARDROCK FISSURED WITH EXCESSIVE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. UNSUPPORTING NO FLOW
    Mine Support Chars. TIMBER W/LAGGING CONCRETE-UNREINFOR
    Length of Inclines (m) 30
    Slope of Inclines 72
    Number of Inclines 2
    Avg. Length of Adits (m) 10
    Number of Adits 1
    1st Condition of Workings OPEN
    2nd Condition of Workings CAVED AT PORTAL
    3rd Condition of Workings NO MINE ENTRY

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 0060090561
USGS Mineral Resources Data System MRDS M004640 MAS references MRDS

Bibliographic references

  • Deposit

    CAL. DIV. MINES GEOL BULL 134,PT3CHAP.2, P.41,PL.5

  • Deposit

    CAL. COUNTY REPT NO.2,P.129 1962

  • Deposit

    COOP WAR MINERAL INVEST, CALAVERAS CO. NO.3, UNPUBL. TALIAFE

Reporter information

Type Date Name Affiliation Comment
Reporter 05-NOV-1984 Unknown U.S. Bureau of Mines