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High Plateau Mine

Past Producer in Del Norte county in California, United States with commodity Chromium
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Geologic information

Identification information

Deposit ID 10043686
MRDS ID M100586
Record type Site
Current site name High Plateau Mine
Alternate or previous names Brown's Mine

Geographic coordinates

Geographic coordinates: -123.95033, 41.92788 (WGS84)
Elevation 792
Relative position APPROX 10 KM NE OF GASQUET, CA.
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Geographic areas

Country State County
United States California Del Norte

Public Land Survey System information

Meridian Township Range Section Fraction State
Humboldt 018N;018N;018N 002E;002E;002E 28;28;28 NW OF NE OF S2 California

Comments on the location information

  • MINE LOCATED ON NORTH SIDE OF PERIDOTITE CANYON, ABOUT 250 FT. BELOW TOP OF RIDGE.

Commodities

Commodity Importance
Chromium Primary

Materials information

Materials Type of material
Chromite Ore
Magnetite Gangue
Uvarovite Gangue

Alteration

  • (Local) Partial Serpentinization Of Dunite

Analytical data

Result 50-55% CR2O3
Result CR TO FE RATIO OF 2.94-3.74 TO 1.

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite

Nearby scientific data

(1) -123.95033, 41.92788
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Ore body information

  • General form LENSE
    Strike N 20 W
    Dip 10-15 E
    Thickness 4.88M

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1917
Discoverer H.H. Morrell And John Hester
Year of first production 1918
Year of last production 1958

Land status

Ownership category National Forest

Ownership information

  • Type Owner-Operator
    Owner Brown, Eugene R.
    Home office Star Route, Highway 199, O'Brien, Ore., 97534; 503-596-2918

Production statistics

  • Year 1945
    Period 1937-1945
    Material ORE
    Accuracy Accurate
    Description Cp_Grade: ^50-55% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 53wt-pct

Reserves and resources

  • Type In-situ
    Estimate year 1958
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 50 wt-pct Chromium Major 1958

Comments on the reserve resource information

  • STINSON, 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED

Comments on the workings information

  • MINE DEVELOPED BY TWO ADITS WITH CROSSCUTS, DRIFTS AND RAISES.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS M100586

Bibliographic references

  • Deposit

    STINSON, M.C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED

  • Deposit

    WELLS, F.G., CATER, F.W., JR., AND RYNEARSON, G.A., 1946, CHROMITE DEPOSITS OF DEL NORTE COUNTY, CA.: CDMG BULL 134, PART 1, CHAPT. 1, P. 32-35, 37.

  • Production

    STINSON, 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED

General comments

Subject category Comment text
Deposit THE DEPOSIT ORIGINALLY CONSISTED OF A SINGLE CONTINOUS TABULAR ORE BODY THAT HAS NOW BEEN BROKEN BY TWO LARGE FAULTS.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1982 Oster, Karel L. (Albers, John P.) U.S. Geological Survey