The Dobbas Mine is a chromium mine located in El Dorado county, California at an elevation of 919 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: 919 Feet (280 Meters)
Commodity: Chromium
Lat, Long: 38.79722, -120.07778
Map: View on Google Maps
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.
Dobbas Mine MRDS details
Site Name
Primary: Dobbas Mine
Commodity
Primary: Chromium
Tertiary: Iron
Location
State: California
County: El Dorado
District: Flagstaff Hill 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
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Not available
Orebody
Form: IRREGULAR PODS AND LENSES
Structure
Type: L
Description: Ore In Area C Cut By Vertical, Ew Striking Faults.
Alterations
Alteration Type: L
Alteration Text: Much Of Ultramafic Rock Altered To Talc Chlorite Or Talc Serpentine.
Rocks
Not available
Analytical Data
Analytical Data: ORE RANGES 6-30% CR2O3, CR: FE RATIO 0.67
Materials
Gangue: Magnetite
Gangue: Magnesite
Comments
Comment (Commodity): ORE HAS VERY HIGH IRON CONTENT
Comment (Deposit): MINERALIZED ZONE'S DIMENSIONS GIVEN ABOVE.
Comment (Geology): DEPOSIT LOCATED NEAR NORTHERN END OF ELONGATED N-S TRENDING ULTRAMAFIC MASS APPROX 5 MILES LONG AND 1 MILE WIDE, WHICH FORMS FLAGSTAFF HILL. MOST OF THE ORE BODIES TREND N TO NW, ROUGHLY PARALLEL TO THE EASTERN MARGIN OF THE ULTRAMAFIC MASS, AND LIE FROM 200 FT TO 1000 FT WEST OF THE CONTACT.
Comment (Workings): DOBBAS MINE CONSISTS OF WORKINGS, DIVIDED INTO 5 GROUPS, A THROUGH E, WHICH EXTEND APPROX A MILE ALONG A RIDGE N FROM FLAGSTAFF HILL. AREA A CONSISTS OF 3 OPEN CUTS, AND AN ADIT. UNDERGROUND WORKINGS INACCESSIBLE. APPROX 1 TON "HIGH-GRADE" DISSEMINATED ORE PILED ON DUMP. AREA B INCLUDES 6 OLD PITS AND ONE NEW PIT. ORE IN NEW PIT STRIKES N 30 W AND DIPS STEEPLY TO EAST. AREA C CONSISTS OF 10 PITS OR CUTS, TWO ADITS AND ONE SHAFT. LAYERS OF CHROMITE STRIKE N 45 W. AREA D IS WORKED B4 A NUMBER OF TRENCHES. ORE STRIKES N 20 W AND DIPS 75 E. AREA E CONSISTS OF AN OPEN CUT AND A NUMBER OF EXPLORATORY TRENCHES. ORE STRIKES N 60 W AND DIPS 60 N.
Comment (Reserve-Resource): LARGE RESERVES MAY BE OF LITTLE ECONOMIC VALUE BECAUSE OF HIGH IRON CONTENT OF CHROMITE.
References
Reference (Deposit): CDMG BULL 134, P. 146-148
Reference (Deposit): STINSON, M.C., 1976, MINERAL PROPERTY REPORT, CDMG UNPUBLISHED REPORT.
Reference (Production): CDMG BULL 134, P. 110
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.
