Rho A

The Rho A is a boron-borates mine located in San Bernardino county, California.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

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Site Name

Primary: Rho A

Commodity

Primary: Boron-Borates
Tertiary: Arsenic

Location

State: California
County: San Bernardino
District: East Kramer Colemanite Area

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Owner Name: Tenneco Mining Inc.
Years: 1976 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1957
Discovery Method: Geophysical Anomaly
Years of Production:
Organization:
Significant: N
Deposit Size: M

Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Sonoran Desert

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

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

Materials

Ore: Colemanite
Gangue: Realgar
Gangue: Orpiment
Gangue: Calcite

Comments

Comment (Reserve-Resource): 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.

Comment (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).

References

Reference (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.

Reference (Other Database): CIMRI

Reference (Reserve-Resource): EVANS AND ANDERSON, 1976; GRISWOLD, 1959.

Reference (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.

California Gold

"Where to Find Gold in California" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in California. Read more: Where to Find Gold in California.