Red Ledge Mine Area

Occurrence in Sierra county in California, United States with commodity Nickel

Geologic information

Identification information

Deposit ID 10033789
MRDS ID M020434
Record type Site
Current site name Red Ledge Mine Area
Related records 10262096

Geographic coordinates

Geographic coordinates: -120.9077, 39.44488 (WGS84)
Relative position ON S. SLOPE OF PLIOCENE RIDGE IN TAHOE NATIONAL FOREST. 6 MI. TO ALLEGHANY BY GRADED DIRT ROAD.
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Geographic areas

Country State County
United States California Sierra

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 018N;018N 009E;010E 01,12;06,07 California

Commodities

Commodity Importance
Nickel Tertiary

Materials information

Materials Type of material
Ankerite Gangue
Magnetite Gangue

Analytical data

Result CHIP SAMPLE ASSAYED 0.30 PERCENT NICKEL

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate

Nearby scientific data

(1) -120.9077, 39.44488

Comments on the geologic information

  • GEOL.DESC: AREA UNDERLAIN BY PROMINENT MASS OF SERPENTINITE THAT IS INTRUSIVE INTO OLDER ROCKS OF CALAVERAS GROUP AND TAYLOR FORMATION. LOCALLY, ESPECIALLY NEAR RED LEDGE MINE, SERPENTINITE WAS ALTERED TO SILICA-CARBONATE ROCK, WHICH CONSISTS OF MARIPOSITE, ANKERITE, SECONDARY QUARTZ IN VEINLETS, AND MAGNETITE. THE MARIPOSITE IS NICKEL BEARING. LYING UPON SERPENTINITE AND SILICA-CARBONATE ROCK IS MANTLE OF DEEP, NICKEL-BEARING REDDISH-BROWN LATERITE AND SILICA BOXWORK, UP TO 50 FT. DEEP IN PLACES. RANGE AND AVERAGE DEPTH UNKNOWN.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No
Discovery year 1855

Land status

Ownership category National Forest

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS M020434

Bibliographic references

  • Deposit

    FERGUSON, H.G., AND GANNETT, R.W., 1932 , GOLD-QUARTZ VEINS OF THE ALLEGHANY DISTRICT, CALIF: U.S.G.S. PROF. PAPER 172 , 139 P.

  • Deposit

    CHESTERMAN, C.W., 1976 , WRITTEN COMMUNICATION.

General comments

Subject category Comment text
Deposit Discovery Year: GOLD RECOVERED FROM LODE AND PLACER DEPOSITS SINCE MIDDLE 1850'S. NICKELIFEROUS LATERITE IDENTIFIED, 1975

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1978 Killman, K.; Albers, J. U.S. Geological Survey