The Thayer is a copper mine located in Amador 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.
Thayer MRDS details
Site Name
Primary: Thayer
Secondary: Greyhouse
Secondary: Grey House
Commodity
Primary: Copper
Secondary: Lead
Secondary: Zinc
Location
State: California
County: Amador
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
Type: Surface/Underground
Ownership
Owner Name: East Bay Municipal Utility District
Home Office: Oakland, Ca.
Production
Not available
Deposit
Record Type: Site
Operation Category: 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
Type: L
Description: Faults; 3 Types, 1)East Dipping High-Angle Strike Faults, 2)Low-Angle Reverse Faults, Strike N50w - N., Dip 25 - 50 E. 3)High-Angle Faults, Strike Ne. Folds With Awplitudes 1 - 6 Ft., Plunge 78 - 84 N, Most Overturned With Axial Planes Dipping Eastward At High Angles.
Alterations
Alteration Type: L
Alteration Text: Sericitization, Silicification, Pyritization.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Galena
Ore: Sphalerite
Ore: Pyrite
Ore: Chalcopyrite
Gangue: Quartz
Comments
Comment (Workings): DEVELOPED BY CUTS AND ONE SHAFT 250 FT. DEEP WITH LEVELS AT 40 , 200 , 240 FT. 40 FT. LEVEL CONSISTS OF CROSSCUT 210 FT. EAST AND 30 FT. WEST OF SHAFT. 240 FT. LEVEL HAS A CROSSCUT AND DRIFT EXTEND ABOUT 700 FT. NW.
Comment (Production): NO PRODUCTION REPORTED.
Comment (Deposit): DISSEMINATED SULFIDES IN SHEARED META-VOLCANIC INTRUDED BY QUARTZ PORPHYRY.
References
Reference (Deposit): AUBURY, L.E., 1908 , COPPER RESOURCES OF CALIFORNIA BULL. 50 ; CALIF. MIN. BUR., P. 225
Reference (Deposit): GOODWIN, J.G., 1957 , LEAD AND ZINC IN CALIFORNIA; CALIF. JOUR. MINE AND GEOLOGY; VOL 53 , NO. 314 , P. 419
Reference (Deposit): HEYL, G.R., 1948 , GRAYHOUSE AREA, AMADOR COUNTY, CALIFORNIA; COPPER IN CALIFORNIA BULL 144 ; DIV. OF MINES, P. 85 - 91
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.
