The O'Brien Mine is a mine located in El Dorado county, California at an elevation of 1,440 feet.
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
Elevation: 1,440 Feet (439 Meters)
Commodity:
Lat, Long: 38.8261, -120.89640
Map: View on Google Maps
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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.
O'Brien Mine MRDS details
Site Name
Primary: O'Brien Mine
Secondary: S-Bend Mine
Commodity
Tertiary: Iron
Tertiary: Chromium
Location
State: California
County: El Dorado
District: Garden Valley Area
Land Status
Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Type: Private Lease
Type: Patented
Workings
Not available
Ownership
Owner Name: Volo Mining Co., Last Operator 1942
Home Office: California
Info Year: 1976
Owner Name: Maragret G Bell,1976
Percent: 100.0
Home Office: California
Info Year: 1976
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Underground
Mining Method: Unknown
Year First Production: 1918
Discovery Year: 1917
Years of Production:
Organization:
Significant: N
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Unknown: Chromite
Unknown: Olivine
Unknown: Pyroxene
Unknown: Talc
Unknown: Serpentine
Comments
Comment (Deposit): AVERAGE GRADE OF ORE SHIPPED IN 1918 WAS 32-34% CR2O3, FROM TOTAL PRODUCTION APPROX 3200 TO 3500 TONS, RECORD 700 AND RESERVE ESTIMATES BASED ON CATERSOBSERVATION, CITED FROM REC INSUFFICIENT ORE FOR COSTING ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES-DISSEMIN E=S102 03.69,CR2O3 43.85,FEO 10.65,TOTAL FE 12.87,AL203 19.8 9.07,CR/FE 3.00.
References
Reference (Deposit): COOP WAR MINERALS INVESTIG. EL DORADO CO. NO.28 1918, TALIA
Reference (Deposit): CATER, CALIF DIV MINES BULL, 134,PT 3,CH 4,P.156, 1951
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.
