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El Dorado

Past Producer in El Dorado county in California, United States with commodities Copper, Gold, Silver, Zinc, Nickel
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10034098
MRDS ID M020798
Record type Site
Current site name El Dorado
Alternate or previous names Roosevelt
Related records 10284673

Geographic coordinates

Geographic coordinates: -120.85046, 38.84379 (WGS84)
Relative position 1 MILE SE OF GARDEN VALLEY

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Garden Valley(quadrangle 1:24,000 scale)

Placerville(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

South Fork American(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California El Dorado

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 012N 010E 34 California

Commodities

Commodity Importance
Copper Primary
Gold Secondary
Silver Secondary
Zinc Critical Secondary
Nickel Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore

Analytical data

Result 5 - 10% CU, 1.5% ZN, 1 OZ/TON AG, TRACES OF NICKEL AND GOLD.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate

Nearby scientific data

(1) -120.85046, 38.84379
ListMap

Economic information

Ore body information

  • General form LENTICULAR
    Strike NW
    Dip NE OR VERTICAL
    Length 182.88M

Comments on the geologic information

  • GEOL.DESC: COUNTY ROCK IS MARIPOSA SLATE WITH SMALL AMOUNTS OF FINE-GRAINED GREEN TUFFACEOUS ROCK INTERBEDDED WITH SLATE.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Production years 1951

Comments on the production information

  • DURING EARLY 1940'S SOME COPPER ORE WAS MINED, ORIGINALLY WORKED FOR GOLD IN 1860'S. 75 TONS OF ORE WAS STOCKPILED PRIOR TO 1945. SMALL PRODUCTION OF CU-ZN DURING 1951

Comments on the workings information

  • TWO COMPARTMENT 100 FT. SHAFT INCLINED TO EAST. A NORTH-TRENDING 173 FT. ADIT, DRIVEN AS A CROSSCUT FOR 46 FT. AND AS A DRIFT FOR 127 FT., CONNECTS WITH THE SHAFT ON THE 50 FT. LEVEL, 128 FT. FROM ADIT PORTAL ON 100 FT. LEVEL THERE DRIFTS EXTENDING 35 FT, TO THE NORTH AND 10 FT. TO THE SOUTH.

Reference information

Bibliographic references

  • Deposit

    CLARK, W.B. AND CARLSON, D.W., 1956 , MINES AND MINERAL RESOURCES, EL DORADO COUNTY, CA: CALIF JOUR. MINES AND GEOLOGY VOL. 52 , NO. 4 : DIV. OF MINES, P. 395 - 396 .

  • Deposit

    GOODWIN, J.G., 1957 ; LEAD AND ZINC IN CALIFORNIA: CALIF. JOUR. MINES AND GEOLOGY, VOL. 53 , NOS. 3 & 4 : DIV. OF MINES, P. 441 - 442

  • Production

    GOODWIN, J.G., 1957 , P. 442

General comments

Subject category Comment text
Deposit MASSIVE SULFIDE BANDS SEVERAL FEET IN THICKNESS HAVE EVIDENTLY REPLACED THE GREEN TUFFACEOUS ROCK.
Deposit U.S. BUREAU OF MINES EXPLORED WITH 1,613 FT. OF DRILL HOLES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-1978 Fraticelli, L. A. (Albers, J.) U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.