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  3. Mineral Resource Data System (MRDS)

Black Bear Mine

Producer in Stanislaus 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. Ore body information
  12. Controls for ore emplacement
  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. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10043421
MRDS ID M100176
Record type Site
Current site name Black Bear Mine

Geographic coordinates

Geographic coordinates: -121.41213, 37.39798 (WGS84)
Relative position ASSUMED CENTER OF SECT. 22

Site location context

Political divisions (FIPS codes)

Stanislaus(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Boardman(quadrangle 1:24,000 scale)

San Jose(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Panoche-San Luis Reservoir(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management CA)

Bureau of Land Management CA BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States California Stanislaus

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 006S 005E 22 CENTER California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Serpentinized Dunite

Analytical data

Result ORE AVERAGED 50% CR203

Host and associated rocks

  • Host or associated Associated
    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 > Dunite
    Rock unit name Franciscan
    Rock description Franciscan

Nearby scientific data

(1) -121.41213, 37.39798
ListMap

Economic information

Ore body information

  • General form LENSE

Controls for ore emplacement

  • Shear Zone

Comments on the geologic information

  • CHROMITE DEPOSITS OCCUR IN AN ULTRAMAFIC BODY THAT TRENDS N70W, IS 8 MILES LONG AND 1.5 MILES WIDE.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1918

Mining district

District name Del Puerto Area

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner West Coast Chrome Co.
    First year 1941

Comments on the workings information

  • WORKINGS CONSISTED OF OPEN PITS, ADITS AND NARROW STOPES

Reference information

Bibliographic references

  • Deposit

    WALKER, G.W. AND GRIGGS, A.B., 1953, GEOL. INVESTIGATIONS OF CHROMITE IN CALIF.: CALIF. DIVISION OF MINES BULLETIN 134, PART II, CHAPT. 2, P. 74, 75, 88

General comments

Subject category Comment text
Deposit DEPOSIT AVERAGED 18 INCHES IN WIDTH THROUGH MOST OF STOPED AREA.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1981 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.