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Pillikin Area 1

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. Production statistics
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. Reporter information

Geologic information

Identification information

Deposit ID 10043678
MRDS ID M100577
Record type Site
Current site name Pillikin Area 1
Alternate or previous names East Basin
Related records 10236310

Geographic coordinates

Geographic coordinates: -121.08825, 38.77795 (WGS84)
Relative position APPROX. 5.5 AIR MILES SW OF PILOT HILL.

Site location context

Political divisions (FIPS codes)

El Dorado(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pilot Hill(quadrangle 1:24,000 scale)

Sacramento(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

North 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 011N 008E 28 California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore
Diallage Gangue
Enstatite Gangue
Magnesite Gangue
Olivine Gangue
Serpentine Gangue
Talc Gangue

Alteration

  • (Local) Serpentinization, Alternation To Talc And Magnesite.

Analytical data

Result ENTIRE ORE ZONE CONTAINS 5-10% CR2O3

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Pyroxenite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite

Nearby scientific data

(1) -121.08825, 38.77795
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description A Large Fault Trending N 25 E Cuts Off Ore Bearing Dunite To South.

Ore body information

  • General form IRREGULAR VEINS, LENSES
    Strike N 10 W
    Dip 60 E
    Thickness 30.48M
    Length 609.6M
    Width 121.92M

Comments on the geologic information

  • PILLIKIN DEPOSITS OCCUR IN A TABULAR, NNW-TRENDING ULTRAMAFIC BODY, 3/4 MI WIDE AND 4 MI LONG, THAT DIPS STEEPLY TO THE EAST.

Economic information about the deposit and operations

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

Mining district

District name Flagstaff Hill Area

Land status

Ownership category Private

Production statistics

  • Year 1942
    Period 1940-1942
    Material ORE
    Accuracy Accurate
    Description Cp_Grade: ^11% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 11wt-pct

Comments on the reserve resource information

  • ESTIMATION OF ORE RESERVES MUST AWAIT DRAINAGE OF PIT.

Workings at the site

  • Type of workings Surface
    Overall length 121.92M
    Overall width 121.92M

Comments on the workings information

  • WORKINGS CONSIST (1951) OF A LARGE OPEN PIT WITH ABOVE DIMENSIONS, WHICH IS NOW FLOODED.

Reference information

Bibliographic references

  • Deposit

    USGS BULL. 922-0, P. 441-444

  • Deposit

    CDMG BULL 134, P. 137-138

  • Deposit

    1940 GEOLMAP WELLS, PAGE, JAMES, YATES, FURNISH, KOENIG USGS BULL 922-

  • Production

    CDMG BULL 134, P. 138

  • Reserve-Resource

    CDMG BULL 134, P. 138.

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.