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Corral Flat placer, Mokelumne Hill, Mokelumne Hill District, East Belt, Calaveras Co., California, USA

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A former placer drift Au occurrence/mine located in the SE¼ sec. 7, T5N, R12E, MDM, 1.4 km (0.8 mile) E of Mokelumne Hill (town), at the S side of Happy Valley. Operated during the periods 1870 to 1871, 1880 to 1882, in the mid-1910's, and in 1936. MRDS database stated accuracy for this location is 100 meters.

Mineralization is a placer Au deposit located on the Corral Flat paleochannel. The channel trends SW and contains a bed of gravel 40 feet wide and 12 feet deep. Some of the gravel is cemented and contains many boulders. Gold is coarse and 925 fine in the bottom 3 feet and on bedrock. Local rocks include Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada) and/or Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).

Workings include underground openings comprised of a 2,000 foot tunnel driven in rhyolite from the NW slope of Stockton Ridge. Several winzes were sunk 60 feet to bedrock. 1936 workings include 160 foot vertical shaft, a 40 foot crosscut and a 100 foot drift.

Gravel was said to average $1.50 (period values) of Au per cubic yard.

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1 entry listed. 1 valid mineral.

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References

Logan, Clarence August and Franke, H. (1936), Mines and Mineral Resources of Calaveras Co.: California Division of Mines, California Journal of Mines & Geology, California Division of Mines (Report 32): 32(3): 327, 358, Pl.__. (reference plate No. truncated by the USGS MRDS database)

Clark, Wm. B. & P.A. Lydon (1962), Mines and mineral resources of Calaveras County, California: California Division of Mines & Geology County Report 2; [… Geological Society of America Proceedings, 1933: 312-313, 1934]: 194-195, Pl. C.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109157 & 10284660.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060090499.

 
Mineral and/or Locality  
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