Thayer

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

Name: Thayer  

State:  California

County:  Amador

Elevation:

Commodity: Copper

Lat, Long: 38.25472, -120.88417

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.


Satelite image of the Thayer

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


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