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Murphy Mine

Past Producer in El Dorado county in California, United States with commodity Chromium
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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. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Links to other databases
  18. Bibliographic references
  19. Reporter information

Geologic information

Identification information

Deposit ID 10043723
MRDS ID M100635
Record type Site
Current site name Murphy Mine

Geographic coordinates

Geographic coordinates: -120.95046, 38.52712 (WGS84)
Relative position 2 MI SE OF LATROBE.

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Latrobe(quadrangle 1:24,000 scale)

Placerville(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Cosumnes(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(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 008N 009E 14 SE California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Serpentinization

Analytical data

Result AVG. ORE 15-20% CR2O3, CR: FE RATIO 2.7. CONCETRATES 48% CR2O3

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
    Stratigraphic age (youngest) Late Jurassic
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Harzburgite
    Rock unit name Amador Group
    Rock description Amador Group
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Pyroxenite

Nearby scientific data

(1) -120.95046, 38.52712
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Strongly Developed Joint Planes Strike N20-40e And Dip Steeply To Se.

Ore body information

  • General form IRREGULAR
    Strike N20E
    Dip E
    Length 60.96M

Comments on the geologic information

  • MINE LIES IN NARROW, NW TRENDING ULTRA MAFIC BODY.

Economic information about the deposit and operations

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

Mining district

District name Latrobe Area

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner E. Hadsel, J. Grant
  • Type Owner
    Owner Egloff, W. C.

Comments on the reserve resource information

  • TWO POTENTIAL ORE LOCATIONS: AT GREATER DEPTH ALONG TREND OF N20E FROM MAIN WORKINGS; AREA WEST OF MAIN ORE TREND WHERE EXPOSURES TREND NEARLY PERPENDICULAR TO TREND OF MAIN ORE ZONE.

Comments on the workings information

  • WORKINGS CONSISTED OF 2 OPEN PITS

Reference information

Bibliographic references

  • Deposit

    STINSON, M.C., 1976, MINERAL PROPERTY REPORT, CDMG UNPUBLISHED REPORT.

  • Deposit

    CDMG BULL 134, P. 123-124.

  • Production

    STINSON, 1976, CDMG UNPUBLISHED REPORT.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1980 Oster, Karel L. (Albers, John P.) 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.