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  3. Mineral Resource Data System (MRDS)

Rho A

Occurrence in San Bernardino county in California, United States with commodities Boron-Borates, Arsenic
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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. Reserves and resources
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10023813
MRDS ID I003005
Record type Site
Current site name Rho A

Geographic coordinates

Geographic coordinates: -117.54811, 34.76668 (WGS84)
Relative position ABOUT 30 MILES W OF BARSTOW AND 7 MILES E OF BORON, CALIF.

Site location context

Political divisions (FIPS codes)

San Bernardino(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Red Buttes(quadrangle 1:24,000 scale)

Victorville(quadrangle 1:100,000 scale)

San Bernardino(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Mojave(hydrologic unit)

Northern Mojave(hydrologic accounting unit)

Northern Mojave-Mono Lake(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 San Bernardino

Public Land Survey System information

Meridian Township Range Section Fraction State
San Bernardino 011N 006W 30 SE California

Commodities

Commodity Importance
Boron-Borates Primary
Arsenic Critical Tertiary

Materials information

Materials Type of material
Colemanite Ore
Calcite Gangue
Orpiment Gangue
Realgar Gangue

Analytical data

Result THE ARSENIC CONTENT OF THE ORE RUNS ABOUT 0.14% (1400 PPM). THE GLASS INDUSTRY REQUIRES LESS THAN 287 PPM ARSENIC IN BORATES.

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Mudstone > Claystone
    Rock unit name Tropico Group
    Rock description Tropico Group
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone

Nearby scientific data

(1) -117.54811, 34.76668
ListMap

Economic information

Ore body information

  • Strike NE
    Dip 5-15SE
    Thickness 78.33M
    Length 914.4M
    Depth to top 320.04M

Economic information about the deposit and operations

Development status Occurrence
Commodity type Both
Deposit size Medium
Significant No
Discovery year 1957
Discoverer U.S. Geological Survey

Mining district

District name East Kramer Colemanite Area

Ownership information

  • Type Owner
    Owner Tenneco Mining Inc.
    First year 1976

Reserves and resources

  • Type In-situ
    Estimate year 1976
    Total resources 9070000mt ore
    Commodity Subtype Grade units Group Importance Year
    Boron-Borates B2O3 9 wt-pct Boron Major 1976
  • Type In-situ
    Estimate year 1959
    Total resources 18140000mt ore
    Commodity Subtype Grade units Group Importance Year
    Boron-Borates B2O3 14 wt-pct Boron Major 1959

Comments on the reserve resource information

  • THE FIRST TWO FIGURES ARE ESTIMATED RESERVES BROKEN OUT BY UPPER AND LOWER ORE ZONES. THE UPPER ZONE CONTAINS A SUBZONE OF 12,000,000 ST ORE WITH A GRADE OF 17% B2O3.

Reference information

Bibliographic references

  • Deposit

    GRISWOLD, W.T., 1959, COLEMANITE AS AN IMPORTANT SOURCE OF BORATES: AMERICAN INSTITUTE OF MINING, METALLURGICAL, AND PETROLEUM ENGINEERS, SOCIETY OF MINING ENGINEERS PREPRINT 59H20, 20 P.

  • Deposit

    EVANS, J.R., AND ANDERSON, T.P., 1976, COLEMANITE DEPOSITS NEAR KRAMER JUNCTION, SAN BERNARDINO COUNTY, CALIFORNIA: CALIFORNIA DIVISION OF MINES AND GEOLOGY SPECIAL PUBLICATION 50, 8 P.

  • Other Database

    CIMRI

  • Reserve-Resource

    EVANS AND ANDERSON, 1976; GRISWOLD, 1959.

General comments

Subject category Comment text
Deposit DEPOSIT IS COMPOSED OF 2 OREBODIES-- THE UPPER AND LOWER ZONES SEPARATED BY 25 TO 50 FT OF SHALE AND SANDSTONE. COLEMANITE CRYSTALS ARE DISSEMINATED THROUGH THE COLEMANITE-BEARING ZONES AND IN SEAMLETS AND BEDS AVERAGING 0.25 INCH THICK. ARSENIC MINERALS OCCUR AS DISCONTINOUS VEINS AND PATCHES IN THE ORE. UPPER ZONE: AREA = 7,200,000 SQ FT; DEPTH FROM SURFACE TO MIDDLE OF ZONE = 775-1100 FT; THICKNESS = 10-94 FT (50 FT AVERAGE); LENGTH/ WIDTH = 3000 FT X 2400 FT. LOWER ZONE: AREA = 5,400,000 SQ FT; DEPTH FROM SURFACE TO MIDDLE OF ZONE = 875-1250 FT; THICKNESS = 0-93 FT (55 FT AVERAGE); LENGTH/WIDTH= 3000 X 1800 FT. THE UPPER ZONE CONTAINS A SUBZONE WITH A GRADE OF 17% B2O3 THAT IS 790-1100 FT BELOW THE SURFACE AND 10-40 FT THICK (24.6 FT AVERAGE).

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1993 Orris, Greta J. 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.