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Black Bart Mine Group

Past 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. Production statistics
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10098547
MRDS ID M100175
Record type Site
Current site name Black Bart Mine Group

Geographic coordinates

Geographic coordinates: -121.44019, 37.41436 (WGS84)
Elevation 549
Relative position 22 MILES WEST OF PATTERSON, CA.

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)

Geographic areas

Country State County
United States California Stanislaus

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 006S;006S;006S 008E;008E;008E 16;16;16 E2 OF SW OF NW California

Comments on the location information

  • MINE WORKINGS ON NORTH SIDE OF HIDEOUT CANYON ABOUT 150 FT ABOVE CANYON FLOOR.

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Serpentinzation Of Dunite

Analytical data

Result CONCENTRATES AVERAGED 47.1% CR2O3, 14.2% FE, CR/FE 2.3.

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) -121.44019, 37.41436
ListMap

Economic information

Ore body information

  • General form POD, IRREGULAR
    Dip N 40 TO 80
    Length 27.43M
    Width 0.61M

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. THE ULTRAMAFIC BODY IS INTRUSIVE INTO THE UPPER PART OF EXPOSED FRANCISCAN SECTION.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1917

Mining district

District name Del Puerto Area

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Gary J. Barber, 2133 First St., Livermore, Ca. 94550; (415) 497-6666 (Surface Rights)

Production statistics

  • Year 1957
    Material CON
    Accuracy Accurate
    Description Ap_Grade: ^Avg. 47.1% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Cr2O3 Conc. Chromium Chromium 47wt-pct

Comments on the workings information

  • WORKING CONSISTED (1953) OF AN OPEN PIT, 5 SHORT ADITS AND SOME UNDERGROUND STOPING.

Comments on development

  • MINERAL RIGHTS RESERVED BY ESTATE OF MR. ALPHANOO, PREVIOUS OWNER WHO DIED WITHOUT HEIRS.

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    STINSON, M.C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED.

  • Production

    CDMG BULL 134, PT. 2, CHAPT. 2, P. 74, 75

General comments

Subject category Comment text
Deposit ORE OCCURS IN A STEEPLY DIPPING TABULAR BODY.

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.