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Bunker Mine

Past Producer in Placer 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. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Ownership information
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10103916
MRDS ID M100625
Record type Site
Current site name Bunker Mine
Alternate or previous names Blue Bird Mine 1880's, Bay Tree Prospect, Sunnyside Occurrence

Geographic coordinates

Geographic coordinates: -120.75963, 39.03711 (WGS84)
Elevation 1067
Relative position APPROX. 20 MILES EAST OF AUBURN CO. BY ROAD.

Site location context

Political divisions (FIPS codes)

Placer(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Foresthill(quadrangle 1:24,000 scale)

Truckee(quadrangle 1:100,000 scale)

Chico(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

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 Placer

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 014N 011E 20 SW OF SE OF SE California

Comments on the location information

  • MINE WORKINGS SCATTERED OVER A LARGE AREA AT THE HEAD OF MAD CANYON DRAINAGE, A SOUTH FLOWING TRIBUTARY OF MIDDLE FORK OF AMERICAN RIVER.

Commodities

Commodity Importance
Chromium Critical Primary

Comments on the commodity information

  • ABOVE VALUES FOR ORE SHIPPED 1942-1943

Materials information

Materials Type of material
Chromite Ore
Antigorite Gangue
Chlorite Gangue
Magnetite Gangue
Uvarovite Gangue

Analytical data

Result ORE AVG. 40.64% CR2O3
Result 12.23% FE
Result CR TO FE RATIO 2.27 TO 1

Host and associated rocks

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

Nearby scientific data

(1) -120.75963, 39.03711
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Close Proximity To The Melones Fault Zone

Ore body information

  • General form POD
  • General form POD

Comments on the geologic information

  • DEPOSIT OCCURS IN THE SOUTHERN PART OF A MASS OF ULTRAMAFIC ROCKS THAT INTRUDED PALEOZOIC METAMORPHIC ROCHS OF THE CALAVERAS FORMATION.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1885
Discoverer Frank Hoffman

Mining district

District name Forest Hill Divide Area

Land status

Ownership category National Forest

Ownership information

  • Type Operator
    Owner Embree, L. G.
    First year 1942
    Last year 1943

Comments on the workings information

  • WORKINGS CONSISTED OF A 50 FT DEEP SHAFT WITH A SHORT DRIFT AT THE BOTTOM OF THE SHAFT WESTWARD ALONG STRIKE OF THE ORE BODY.

Reference information

Bibliographic references

  • Deposit

    RYHEARSON, G.A., 1953, CDMG BULL 134, PT. 3, CHAPT. 5, P. 200, 224-227, 307

  • Deposit

    STINSON, M.C., 1975, CDMG MINORAL PROPORTY REPORT, UNPUBLISHED

  • Production

    CDMG BULL 134, PT. 3, CHAPT. 5, P. 226, 227

General comments

Subject category Comment text
Deposit Discovery Year: 1880'S
Deposit CHROMITE BODIES RANDOMLY DISTRIBUTED BUT APPARENTLY CONCENTRATED IN TWO AREAS; CONSISTENTLY HARE THE ABOVE STRIKE; PITCH 70 SE; AND ARE ALIGNED PARALLEL TO THE WELL DEVELOPED SHEARING IN THE PERIDOTITE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-1983 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.