Mine detail: Thayer

Previously called 'GreyhouseGrey House'

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Location

Lat / long:

38.25463, -120.88519

Resource(M)

Primary:	Copper
Secondary:	Lead, Zinc
Ore:	Chalcopyrite, Galena, Pyrite, Sphalerite
Gangue:	Quartz

Production

Operation type:	Unknown
Production size:	Small
Development status:	Producer

Geology

Host type:	Metavolcanic Rock
Structure:	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.
Alteration processes:	Sericitization, Silicification, Pyritization.

References

MRDS	M004856
DEP	10028069
Reference	{Deposit:: AUBURY, L.E., 1908 , COPPER RESOURCES OF CALIFORNIA BULL. 50 ; CALIF. MIN. BUR., P. 225}{Deposit:: GOODWIN, J.G., 1957 , LEAD AND ZINC IN CALIFORNIA; CALIF. JOUR. MINE AND GEOLOGY; VOL 53 , NO. 314 , P. 419}{Deposit:: HEYL, G.R., 1948 , GRAYHOUSE AREA, AMADOR COUNTY, CALIFORNIA; COPPER IN CALIFORNIA BULL 144 ; DIV. OF MINES, P. 85 - 91}
Reporter	Gere, W., Fraticelli, L. A. (Albers, J.)