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
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Rho A MRDS details
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.
