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Booker Lease Occurrence

Past Producer in Tuolumne 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. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Ownership information
  14. Production statistics
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10043697
MRDS ID M100599
Record type Site
Current site name Booker Lease Occurrence
Alternate or previous names Beckwith Ranch Mines

Geographic coordinates

Geographic coordinates: -120.50322, 37.8727 (WGS84)

Site location context

Political divisions (FIPS codes)

Tuolumne(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Keystone(quadrangle 1:24,000 scale)

Oakdale(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Stanislaus(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 Tuolumne

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 001S 013E 02 SE California

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Analytical data

Result ORE AVG. 36% CR2O3

Host and associated rocks

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

Nearby scientific data

(1) -120.50322, 37.8727
ListMap

Economic information

Ore body information

  • General form LENSE
    Strike N 60 W
    Dip 75 NE
    Width 0.91M

Comments on the geologic information

  • THE DEPOSIT OCCURS IN THE NORTHERN PART OF THE WESTERN PART OF TWO SERPENTINE BELTS THAT TREND NW-SE ACROSS THE COUNTY. THE BELT IS EXPOSED OVER AN AREA 30 KM BY 6 KM.

Economic information about the deposit and operations

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

Mining district

District name Chinese Camp Area

Ownership information

  • Type Owner
    Owner Beckwith, R. B.

Production statistics

  • Year 1919
    Period World War I
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^Avg. 36% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 36wt-pct

Comments on the workings information

  • WORKINGS CONSIST OF A LONG NARROW TRENCH.

Reference information

Bibliographic references

  • Deposit

    CATER, F. W. JR., 1948, CDMG BULL 134, PART 3, CHAPT. 1, P. 20

  • Production

    CDMG BULL 134, PT. 3, CHAPT. 1, P. 20

General comments

Subject category Comment text
Deposit ORE ZONE IS PARALLEL TO SCHISTOSITY IN THE SERPENTINE AND BROKEN UP BY A SERIES OF FAULTS.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1982 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.