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Washout Claim

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

Identification information

Deposit ID 10261204
MAS/MILS ID 0060610574
Record type Site
Current site name Washout Claim

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -120.78543, 39.03519 (WGS84)
Elevation 997
Location accuracy 500(meters)
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Geographic areas

Country State County
United States California Placer

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 014 N 011 E 30 NENENW California

Commodities

Commodity Importance
Chromium Tertiary
Iron Tertiary

Materials information

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

Nearby scientific data

Main Entrance (1) -120.78543, 39.03519
ListMap

Ore body information

  • Strike N40W
    Dip 75S
    Thickness 3M
    Depth to top 1M
    Width 5M
    Length 38M
    Area 1HA
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 IRREGULAR
    Shape of Orebody #2 TABULAR
    Shape of Orebody #3 LENTICULAR
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control LITHOLOGY
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONITIZATION
    Strike And Dip N40W
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 1
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 1
    Date of Last Modification 810326

Economic information

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1940
Year of first production 1941

Mining district

District name Forest Hill Divide Area

Mineral rights holdings

Type of mineral rights Other

Land status

Ownership category BLM Administrative Area

Ownership information

  • Type Owner-Operator
    Owner G. S. Ford, J. S. Lower, B. Myers (Last Owner-Operators)
    Interest 100
    Home office California
    Year 1976
    Last year 1944

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 1
    Hardness of Ore M-HARD ROCKS
  • Type of workings Underground
    Length 15M
    Overall depth 8M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Mining Method OPEN STOPE
    Swell Factor .6
    Hardness of Rock SOFT NONPLASTIC FISSURED MODERATE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. UNSUPPORTING NO FLOW
    Mine Support Chars. TIMBER W/LAGGING CONCRETE-UNREINFOR
    Number of Shafts 1
    1st Condition of Workings UNKNOWN

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
U.S. Bureau of Mines Minerals Availability System MAS 0060610574

Bibliographic references

  • Deposit

    AVERILL,CV.1941 UNPUBL CAL ST MINING BUR FIELD REPT,PLACER C

  • Deposit

    RYNEARSON,GA 1953 CAL DIV MINES BULL 134,PT 3,CH 5 PP 227-22

General comments

Subject category Comment text
Deposit APPROX 467 TONS WERE SHIPPED BETWEEN 1940 AND 1944,ORE AVERA 3% CR2O3,CR/FE=2.51.GOOD LUMP ORE RAN 52% CR2O3,CR/FE GREATER MINE NOT FOUND DURING FIELD VISIT-APPROX LOCATION. NO RESER MATE INSUFFICIENT DATA FOR MATRIX CALCULATIONS.

Reporter information

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