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

Black Bart Mine

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

Geologic information

Identification information

Deposit ID 10102842
MRDS ID M008926
Record type Site
Current site name Black Bart Mine
Alternate or previous names Great Western Mine, Tucker Lease
Related records 10260458

Geographic coordinates

Geographic coordinates: -122.64357, 38.71321 (WGS84)
Elevation 701
Relative position MINE LOCATED ON A NE FACING SLOPE, ABOUT 1000 FT. NW AND ACROSS THE ROAD FROM THE OLD GREAT WESTERN QUICKSILVER MINE.

Site location context

Political divisions (FIPS codes)

Lake(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Saint Helena(quadrangle 1:24,000 scale)

Healdsburg(quadrangle 1:100,000 scale)

Santa Rosa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Lake

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 010N;010N;010N 007W;007W;007W 16 ;16 ;16 NW OF NE OF SW California

Comments on the location information

  • TO REACH MINE, TAKE HIGHWAY 29 2.5 MILES SOUTH OF MIDDLETOWN AND GO RIGHT ON THE CLAYTON-WESTERN MINE ROAD FOR 2.4 MILES. A SHORT SPUR ROAD ON THE RIGHT LEADS TO THE MINE.

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Analytical data

Result ORE AVERAGED 48% CR2O3.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
    Rock unit name Franciscan
    Rock description Franciscan
    Stratigraphic age (youngest) Late Jurassic

Nearby scientific data

(1) -122.64357, 38.71321
ListMap

Economic information

Ore body information

  • General form LENSE, IRREGULAR OTHER STRINGERS

Comments on the geologic information

  • THE CHROMITE BEARING SERPENTINE FORMS A LINEAR, NW TRENDING BELT THAT AVERAGES 1 MILE WIDE AND 20 MILES LONG. IN THE VICINITY OF THE MINE, THE SERPENTINE IS HIGHLY WEATHERED AND SHEARED.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant No
Year of first production 1917
Year of last production 1918

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Anglo-American Mining Co.
    Home office Clovis, Ca.
    First year 1942
  • Type Owner
    Owner D. Morse, Et. Al., 1291 Mountain View Ave., St. Helena, Ca. 94574 And Bounsalls, 1510 Diamond Mounta

Comments on the production information

  • THE MINE IS CREDITED WITH 125 TONS OF ORE CARRYING 45 TO 50% CR2O3. ORE RANGED FROM MASSIVE HIGH-GRADE CHROMITE TO LOW-GRADE DISSEMINATED ORE, AND FROM 20 TO 50% CR2O3.

Workings at the site

  • Type of workings Surface/Underground
    Overall depth 15.24M

Comments on the workings information

  • IN 1917, THE ORE BODY WAS DEVELOPED BY OPEN PIT METHODS. IN 1918, UNDERGROUND METHODS WERE USED. THREE WELL TIMBERED TUNNELS GAVE ACCESS TO A COMPLEX ARRAY OF DRIFTS, CROSS CUTS, RAISES AND STOPES. IN 1975, WHEN THE MINE WAS VISITED, ONLYA LARGE BENCHED OPEN CUT REMAINED.

Comments on development

  • OWNERS: D. MORSE, ET. AL., 1291 MTN. VIEW AVE., ST. HELENA, CA. 94574 AND THE BOUNSALLS, 1510 DIAMOND MTN. RD., CALISTOGA, CA. 94515. ORIGINALLY THE PROPERTY WAS MINED FOR QUICKSILVER. 1942 OPERATION LIMITED TO CLEAN UP OF OLD WORKS.

Reference information

Bibliographic references

  • Deposit

    BRADLEY, W.W., ET. AL., 1918, CHROMIUM AND MANGANESEIN CALIF.: CALIF. STATE MINING BUREAU BULLETIN 76, P. 149.

  • Deposit

    DOW, D.H. AND THAYER, T.P., 1946, GEOLOGICAL INVEST IGATIONS OF CHROMITE IN CALIF.: CALIF. DIVISION OF MINES BULLETIN 134, PART 2, CHAPT. 1, P.10, 11, 32.

  • Deposit

    STINSON, M.C., 1975, MINERAL PROPERTY REPORT, CALIF.DIVISION OF MINES AND GEOLOGY UNPUBLISHED REPORT.

General comments

Subject category Comment text
Deposit ORE BODIES WERE USUALLY LESS THAN 1 FT THICK. HOWEVER, SEVERAL ORE BODIES WERE ABOUT 5 FT WIDE, 50 FT THICK, HAD AN E-W STRIKE FOR 50 FT AND DIPPED TO THE SOUTH. SOME ORE BODIES HAD HIGHER CONCENTRATIONS OF CHROMITE IN THE CORE WHILE OTHERS HAD IT CONCENTRATED TOWARDS THE MARGINS.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1973 Gere, W. U.S. Geological Survey
Updater 01-JUN-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.