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Petticoat Mine, Independence, Railroad Flat District, Calaveras Co., California, USA
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Latitude: 38°20'57"N
Longitude: 120°30'31"W
A former lode Au mine located in the NE¼ (estimated) sec. 26, T6N, R13E, MDM, 0.4 km (0.3 mile) E of Independence and 0.7 km (0.4 mile) NNE of Railroad Flat (3½ miles SSE of West Point). MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is a vein deposit hosted in slate and schist. The ore body strikes N15W and dips 65NE at a thickness of 2.13 meters. A 2 to 7 foot thick vein occurs in graphitic schist and quartz-mica schist. Local rocks include Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada).

Workings include underground openings comprised of a shaft with an inclined depth of 680 feet. A second shaft 1,200 feet N is 210 feet deep. Both are now caved.

Production data are found in: Clark, Wm. B. & P.A. Lydon (1962).

Total output was in excess $150,000 (period values). During 1867, one 42 ton lot of ore yielded over $2,500 (period values).

Mineral List


2 entries listed. 2 valid minerals.

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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: 32(3): 315.

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]: 38, 39, 66, 173, Pl. B.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 16 (map 2-6).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10029345 & 10235209.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060091561.

USGS crib list.

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