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Del Rio Mining Company property (Del Reo Mining Co.), Tulloch Dam, Calaveras Co., California, USA
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Latitude: 37°51'45"N
Longitude: 120°39'15"W
A Au occurrence located in secs. 3, 4, 7, 9, 10, 11 & 21, T1S, R12E, MDM, 4.6 km (2.8 miles) WSW of the Tulloch Dam near the Tuolumne County and Stanislaus County lines. The property consisted of 5,823 acres. MRDS database stated accuracy for this location is 500 meters. The only evidence of Au is a mine symbol in the NE¼ (projected) sec. 9. A mine symbol in the SE¼SE¼ sec. 5 (unsurveyed) might have been considered to be in 4.

Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).

Workings include unspecified underground openings.

Mineral List


1 entry listed. 1 valid mineral.

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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): 302.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10028774 & 10211470.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060090383.

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