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Eldorado

Past Producer in Sierra county in California, United States with commodities Gold, Zinc, Lead, Copper
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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 10106527
MRDS ID X025373
Record type Site
Current site name Eldorado
Alternate or previous names Eldorado Ext, Terrible
Related records 10213440

Geographic coordinates

Geographic coordinates: -120.83353, 39.46656 (WGS84)
Relative position 1/2 MI E OF ALLEGHANY

Site location context

Political divisions (FIPS codes)

Sierra(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Alleghany(quadrangle 1:24,000 scale)

Truckee(quadrangle 1:100,000 scale)

Chico(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Yuba(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Federal lands

Tahoe National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California Sierra

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 019N;018N 010E;010E 34,35;02,03 California

Comments on the location information

  • UTM ACC. SE 1/4 34

Commodities

Commodity Importance
Gold Primary
Zinc Critical Tertiary
Lead Tertiary
Copper Tertiary

Comments on the commodity information

  • ORE SHOOTS OF HIGH-GRADE ORE ALL HIGH GRADE ORE OF VEIN IS IN BEND, WHERE QTZ IS PRESENT ONLY IN LENSES. PRINCIPAL GOLD ASSOCIATED W ARSENOPYRITE

Materials information

Materials Type of material
Galena Ore
Gold Ore
Pyrite Ore
Tetrahedrite Ore
Marble Gangue
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
    Stratigraphic age (youngest) Late Permian
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -120.83353, 39.46656
ListMap

Economic information

Ore body information

  • Strike NNW
    Dip E

Comments on the geologic information

  • 3 VEINS; EASTERN MAIN VEIN, EL DORADO, CONTINUOUS EXCEPT AT BEND - FROM N 50 W TO N 30 E STRIKE. BEND MAYBE DUE TO CROSSING OF SERPENTINE DIKE. POST MINERAL THRUSTS & INTERMINERAL THRUSTS. OUTCROP OF COARSE CRYSTALINE MARBLE AT PORTAL. DIKES OF GABBRO ALSO FAULTED BY ELDORADO VEIN. TWO SMALL MASSES OF APLITE OUTCROP IN S PART OF CLAIM. COUNTRY ROCK AMPHIBOLITE SCHIST. GROOVING ON HANGING WALL HAS N 85 E, & ELSEWHERE N 65 E STRIKE, THE LATTER MOST INTENSE. VEIN REOPENING INDICATED BY QTZ-CEMENTED BRECCIA ALONG HANGING WALL. VEIN FOLLOWS REVERSE FAULT, SAME AS PLUMBAGO VEIN MAYBE, DISPLACEMENT 50 FT IN N, 100 FT IN S. MIDDLE AND BULLION VEINS, STRIKE N 30 W & NO 20 W.

Economic information about the deposit and operations

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

Comments on the production information

  • ELDORADO IS PRODUCTIVE VEIN.

Comments on the workings information

  • AT LEAST 3 ADITS, WINZES, SUBLEVELS W 3600 FT DRIFTS, 1000 FT RAISES & WINZES.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit VEINS, ORE SHOOTS
Deposit 3 UNPATENTED CLAIMS. ; INFO.SRC : 1 PUB LIT

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1979 Hayden, F. (Albers, J.) U.S. Geological Survey

Beyond USGS

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

External references

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.