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Standard Mine, Coloma, Coloma District, West Belt, El Dorado Co., California, USA

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Latitude & Longitude (WGS84): 38° 48' 36'' North , 120° 53' 12'' West
Latitude & Longitude (decimal): 38.81, -120.886666667
 
A former lode Au occurrence/mine located in the N½ (estimated) sec. 17, T11N, R10E, MDM, 1.1 km (0.7 mile) N of Coloma, S of Little Gambler Creek & WNW of Murphy Mountain, E of the South Fork American River, on private land. Operated by John Fitzgerald. Operated around 1894. MRDS database stated accuracy for this location is 1,000 meters. Clark & Carlson (1956) show the location as being in sec. 24, but USGS quadrangle Coloma, California (1950) shows it in the SW¼ sec. 17.

Mineralization is a vein/seam deposit. Seams are 2 to 12 inches thick near the contact of granite with slate. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).

Workings include underground openings comprised of a 230 foot adit.


Production data are found in: Clark, Wm. B. & D.W. Carlson (1956).

No other production record was found.

Mineral List



2 entries listed. 2 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

USGS quadrangle Coloma, California, topo map (1950).

Clark, Wm. B. & D.W. Carlson (1956), Mines and mineral resources of El Dorado County, California: California Journal of Mines and Geology (Report 52): 52(4): 533.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10006954, 10029982 & 10260132.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060170427.

 
Mineral and/or Locality  
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