The Cosumnes is a gold mine located in El Dorado 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.
Cosumnes MRDS details
Site Name
Primary: Cosumnes
Secondary: Middle End
Commodity
Primary: Gold
Secondary: Lead
Secondary: Molybdenum
Secondary: Silver
Secondary: Copper
Location
State: California
County: El Dorado
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Lee Miller
Years: 1955 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Discovery Year: 1859
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
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Magnetite
Ore: Powellite
Ore: Bornite
Ore: Chalcopyrite
Ore: Silver
Gangue: Quartz
Gangue: Calcite
Gangue: Garnet
Gangue: Epidote
Comments
Comment (Geology): GEOL.DESC: OTHER ROCKS IN AREA ARE AMPHIBOLITE AND MICA SCHIST
Comment (Workings): 150 FT. CROSSCUT ADIT, DRIVEN WESTWARD WITH DRIFTS RUNNING NE AND SW. 30 FT. RAISE JUST SOUTH OF ADIT - DRIFT INTERSECTION. LOWER CROSSCUT ADIT ABOUT 40 FT. BELOW MAIN ADIT, TWO LEVELS CONNECTED BY WINZE. NUMEROUS OPEN CUTS ABOVE ADIT PORTALS.
Comment (Production): WORKED ORIGINALLY IN 1850; ACTIVE AROUND 1896 AND DURING WWI. DURING WWII A SMALL AMOUNT OF ORE PRODUCED FROM THE OPEN CUTS; REOPENED EARLY IN 1955 AND SEVERAL TONS OF ORE PRODUCED HAVE BEEN STOCKPILED. THREE MEN WORKING IN 1955.
Comment (Deposit): COPPER MINERALS OCCUR IN A CONTACT METAMORPHIC ZONE: TACTITE ZONE - SOME IS RADIOACTIVE.
References
Reference (Deposit): CLARK, W. B. AND CARLSON, D. W., 1956 : MINES AND MINERAL RESOURCES, EL DORADO COUNTY, CA.: CALIF. JOUR MINES AND GEOLOGY, VOL. 52 , NO. 4 : DIV. OF MINES, P. 394 - 395 .
Reference (Deposit): GOODWIN, J. G., 1957 , LEAD AND ZINC IN CALIFORNIA: CALIF. JOUR. MINES AND GEOLOGY, VOL. 53 , NOS. 3 & 4 : DIV. OF MINES, P. 441 .
Reference (Deposit): USGS BULL. 1182E P. 35-36.
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.
