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Pillikin Area 4

Past Producer in El Dorado county in California, United States with commodities Chromium, Iron
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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. Ore body information
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10048019
MRDS ID M700417
Record type Site
Current site name Pillikin Area 4
Alternate or previous names Chrome Gulch

Geographic coordinates

Geographic coordinates: -121.09575, 38.78656 (WGS84)
Relative position APPROX. 5.5 AIRLINE MI 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)

Federal lands

USBR(Federal land areas administered by USBR)

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 21 California

Commodities

Commodity Importance
Chromium Critical Primary
Iron Tertiary

Comments on the commodity information

  • ONE SAMPLE MASSIVE ORE CONTAINED 44.1% CR2O3. ORE HIGH IN IRON.

Materials information

Materials Type of material
Chromite Ore
Talc Gangue

Alteration

  • (Local) Serpentinization, Silicification, Alteration To Talc And Magnesite.

Analytical data

Result ORE BODIES AVERAGE 5% CR2O3

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite
  • 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) -121.09575, 38.78656
ListMap

Economic information

Ore body information

  • General form IRREGULAR LENSES
    Length 121.92M
    Width 27.43M

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

Comments on the workings information

  • WORKINGS CONSISTED (1951) OF A LARGE BULLDOZER SCRAPE AND SEVERAL CUTS. WEST OREBODY'S DIMENSIONS 400 FT LONG, 90 FT WIDE, 140 FT DEEP. EAST ORE BODY'S DIMENSIONS 210 FT LONG; 65 FT WIDE, 75 FT DEEP.

Reference information

Bibliographic references

  • Deposit

    CDMG BULL 134, P. 141-142

  • Reserve-Resource

    CDMG BULL 134, P. 141-142.

General comments

Subject category Comment text
Deposit TWO MAJOR ORE BODIES, CALLED THE EASTERN AND WESTERN ORE BODIES, AND SEVERAL SMALLER ONES ARE EXPOSED. LAYERING OF CHROMITE IN THE MAJOR ORE BODIES IS PROMINENT. IN THE WESTERN BODY, THE LAYERS STRIKE N 5-45 E AND DIP 45-75 NW. THOSE IN THE EASTERN BODY STRIKE N 20 E TO N 10 W AND DIP FROM 55 W TO 80 E.
Deposit ALTHOUGH LOW IN GRADE, THE DISSEMINATED ORE BODIES IN CHROME GULCH APPEAR TO CONTAIN THE LARGEST RESERVES OF ANY GROUP IN THE FLAGSTAFF HILL AREA OR PERHAPS IN CALIFORNIA. ; INFO.SRC : 1 PUB LIT

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.