The Big Seven is a gold mine located in Calaveras county, California at an elevation of 1,375 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: 1,375 Feet (419 Meters)
Commodity: Gold
Lat, Long: 38.00417, -120.63444
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.
Big Seven MRDS details
Site Name
Primary: Big Seven
Commodity
Primary: Gold
Secondary: Zinc
Secondary: Lead
Location
State: California
County: Calaveras
Land Status
Not available
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
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Gold
Ore: Pyrite
Ore: Galena
Gangue: Barite
Gangue: Sericite
Gangue: Calcite
Gangue: Quartz
Comments
Comment (Workings): DEVELOPED BY 110 FT INCLINED SHAFT WITH LEVELS AT 50 AND 100 FT. ON 50 FT LEVEL THERE IS 30 FT WESTWARD CROSSCUT AND FROM 110 FT LEVEL A 75 FT DRIFT SOUTHWARD. AN 80 FT ADIT HAS BEEN DRIVEN SOUTHWARD
Comment (Geology): GEOL.DESC: MINERALIZED ZONE ABOUT 300 FT WIDE OF ALTERED CALCITE, QUARTZ, BARITE AND SERICITE SCHIST
Comment (Commodity): 24% AV FREE.REMAINDER IN SULFIDES. SMALL PIECE OF OR E, MAINLY QUARTZ AND BARITE, RAN $ 12 PER TON IN GOLD.
Comment (Location): UTM ACC, SE SEC OF 20 NE SEC. 27
Comment (Production): ACTIVE PRIOR AND 1936 , NO PRODUCTION RECORD FOUND
Comment (Deposit): VEIN, MINERALIZED ZONE ABOUT 300 FT WIDE OF ALTERED CALCITE, QTZ, BARITE AND SERICITE SCHIST
References
Reference (Deposit): CLARK, W.B., LYDON, P.A., 1962 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIF.; COUNTY REPORT 2 ; CALIF. DIV. OF MINES AND GEOLOGY, P. 138 AND PLB
Reference (Deposit): LOGAN, C.A., FRANKE, H., 1936 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY; CALIF. JOUR. MINES AND GEOLOGY, VOL. 32 , NO. 3 ; DIV. OF MINES, P 243 , 298
Reference (Production): CLARK ( 1962 ), LOGAN ( 1936 )
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.
