The Roberts Sand Company Black Diamond is a silica mine located in Contra Costa 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
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Roberts Sand Company Black Diamond MRDS details
Site Name
Primary: Roberts Sand Company Black Diamond
Commodity
Primary: Silica
Location
State: California
County: Contra Costa
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Silver Sand Co.
Years: 1957 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Pacific Border Province
Physiographic Section: California Coast Ranges
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Sand
Comments
Comment (Production): MINED AND PROCESSED SAND OVER A PERIOD OF NEARLY 25 YEARS, DURING WHICH TIME TOTAL PRODUCTION AMOUNTED TO 367,543 TONS OF SAND VALUED AT $1,347,630. WORKED FOR SAND 1925--49 BY COLUMBIA STEEL CO., ROBERTS ET AL; REOPENED BY SILVER SAND CO. IN 1957. OPERATIONS AT THIS PROPERTY WERE SUSPENDED IN NOVEMBER 1949.
Comment (Workings): ROOM AND PILLAR METHOD UTILIZING HAND AUGER DRILLS.
References
Reference (Deposit): CALIF. JOUR. VOL. 47, NO. 4, OCT. 1951, PP. 583-4; V. 54, NO. 4, OCT. 1958, P. 554, 555, 580, PL.
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.
