1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Pillikin Mine Area 2

Past Producer in El Dorado county in California, United States with commodity Chromium
Map
XML
JSON
KML
B
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. Ownership information
  16. Production statistics
  17. Reserves and resources
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10048017
MRDS ID M700415
Record type Site
Current site name Pillikin Mine Area 2
Alternate or previous names Bonanza King Mine
Related records 10204724

Geographic coordinates

Geographic coordinates: -121.08714, 38.78128 (WGS84)
Elevation 323
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)

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 21,28 California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore
Magnesite Gangue
Talc Gangue

Alteration

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

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Lherzolite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Pyroxenite
  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite

Nearby scientific data

(1) -121.08714, 38.78128
ListMap

Economic information

Ore body information

  • General form IRREGULAR LENSES AND STRINGERS
    Thickness 30.48M
    Length 609.6M
    Width 152.4M

Comments on the geologic information

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

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1853

Mining district

District name Flagstaff Hill Area

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Red Line Transfer Co., San Francisco, Ca.

Production statistics

  • Year 1918
    Period 1914-1918
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^46-47% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Cr2O3 Chromium Chromium 47wt-pct
  • Year 1939
    Period 1936-1939
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^43% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Cr2O3 Chromium Chromium 43wt-pct

Reserves and resources

  • Type In-situ
    Estimate year 1940
    Total resources 453000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 5 wt-pct Chromium Major 1940

Comments on the reserve resource information

  • SOME ORE REMAINS IN THE NORTH AND SOUTH WALLS AND BOTTOM OF PIT 5.

Comments on the workings information

  • WORKINGS CONSISTED (1951) OF TWO LARGE OPEN PITS AND SOME UNDERGROUND WORKINGS. THE LARGER PIT IS CALLED 5 AND THE SMALLER PIT CALLED 5A.

Reference information

Bibliographic references

  • Deposit

    CDMG BULL 134, P. 134-135.

  • Deposit

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

  • Deposit

    USGS BULL 922-0, P. 444-447.

  • Deposit

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

  • Production

    CDMG BULL 134, P. 138-139.

General comments

Subject category Comment text
Deposit ABOVE DIMENSIONS ARE FOR AREA OF CHROMIFEROUS DUNITE INCLUDING SEVERAL DISCONTINUOUS ORE ZONES.

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.