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Post Oak Mine, Hughes Mountain, Fresno Co., California, USA

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A former Cu-Au mine located in sec. 29, T12S, R25E, MDM, 4.2 km (2.6 miles) WNW of Hughes Mountain (coordinates of record), along Hughes Creek, and on the lower eastern slope of Red Mountain. MRDS database stated accuracy for this location is 500 meters.

NOTE: Both referenced MRDS files present the same T&R values for this location. The coordinates provided correspond to that T&R value. MRDS file #10138902 states that the land is part of the Pine Flat Reservoir (U.S. Army Corps of Engineers), and that it is under water. No part of sec. 29 is under water. MRDS file #10076548 appears to have the more accurate description.

Mineralization is a vein deposit hosted in schist. The ore body is 1.22 meters wide. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

Workings include underground openings comprised of a drift 120 feet long with a 40 foot winze at tits end. On the footwall, another vein was opened by a shallow shaft and drift.

production information: Ore averaged 10% Cu and $8.00 per ton Au (period values). Operation was intermittent.

Mineral List



3 entries listed. 3 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

Laizure, Clyde McK (1929), Fresno, Alameda, and San Francisco Counties: California Journal of Mines and Geology, California Mining Bureau (Report 25): 25: 312-313.

Eric, J.C. (1948), Copper in California: California Division of Mines Bulletin 144: 234.

Logan, Clarence August, Lewis T. Braun & James W. Vernon (1951), Mines and mineral resources of Fresno County, California: California Journal of Mines and Geology (Report 47): 47(3): 502, 547, Pl. 31.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10076548 & 10138902.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060190268.

 
Mineral and/or Locality  
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