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Grit

Past Producer in El Dorado county in California, United States with commodity Gold
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Geologic information

Identification information

Deposit ID 10007036
MRDS ID C008046
Record type Site
Current site name Grit
Alternate or previous names Liddicoat, Spanish Dry Diggings
Related records 10260703

Geographic coordinates

Geographic coordinates: -120.91409, 38.95045 (WGS84)
Elevation 561
Relative position 1/4 MI NW OF SPANISH DRY DIGGINGS 1/2 MI DUE E OF SUMMIT HILL
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Geographic areas

Country State County
United States California El Dorado

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 013N 010E 30 California

Comments on the location information

  • UTM ACC SW 1/4 OF NW 1/4 SEC

Commodities

Commodity Importance
Gold Primary

Comments on the commodity information

  • MASS OF CRYSTALLINE AU RECOVERED, WEIGHED 101.4 OUNCES TROY, CONSIDERABLE AMOUNTS OF COARSE CRYSTALLINE PYRITE IS PRESENT. ALL ORE SINCE 1945 IS FROM WEST VEIN, MILL HEADS AVERAGED $18 PER TON AU IN 1952 .

Materials information

Materials Type of material
Gold Ore
Calcite Gangue
Quartz Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
    Rock unit name Mariposa Formation;Mariposa Formation;
    Rock description Mariposa Formation;Mariposa Formation;

Nearby scientific data

(1) -120.91409, 38.95045
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Ore body information

  • General form PINCH & SWELL
    Strike N 20 W
    Dip 80 NE
    Thickness 6.1M
    Depth to top 0M

Controls for ore emplacement

  • Seam Deposit At Surface, Residual Gold From Weathering Processes

Comments on the geologic information

  • IN MARIPOSA SLATE, SMALL PATCHES OF SERPENTINE ORE EXPOSED W OF W VEIN

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Production years ACTIVE 1852 - 1867 , 1919 - 1922 , 1945 - 1952

Comments on the production information

  • VERY PRODUCTIVE IN LATE 1850'S BUT NO PRODUCTION RECORDS AVAILABLE AT THIS TIME

Workings at the site

  • Type of workings Surface/Underground
    Overall length 45.72M
    Overall width 15.24M

Comments on the workings information

  • UPPER WEATHERED ZONE HYDRAULICKED DEVELOPED BY 800 FT SE DRIFT ADIT WITH CROSS CUTS AND EXTENSIVE STOPING TO SURFACE.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS C008046

Bibliographic references

  • Deposit

    CLARK, W. B., AND CARLSON, D. W., 1956 , MINES AND MINERAL RESOURCES OF EL DORADO CO., CALIF.: CALIF. JOUR. OF MINES AND GEOL., VOL 52 , NO. 4 , PG. 415 - 416 , 506 , 570 AND PL 10 .

  • Deposit

    LOGAN, C. A., 1938 , MIN. RESOURCES OF EL DORADO CO.: CALIF. JOUR. OF MINES AND GEOL., VOL. 34 , NO. 3 , PG 262 AND PL II.

  • Production

    CLARK ( 1956 )

General comments

Subject category Comment text
Deposit VEINS OF QUARTZ AND CALCITE, THREE PARALLEL VEINS UP TO 20 FT THICK.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1979 Mateik, R.; Albers, John P. U.S. Geological Survey PARSED HOST ROCK AND ASSOCIATED ROCK INFORMATION FROM OLD SINGLE VALUED FIELD TO NEW MULTIVALUED FIELD
Editor 27-APR-1995 Mosier, Dan U.S. Geological Survey