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Pillikin Mine area 1 (East Basin), Pilliken Mine (Pillikin Mine; Pillikan Mine; Pilliken Chrome Mine), Flagstaff Hill, Salmon Falls District (Flagstaff Hill area), El Dorado Co., California, USA

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A former Cr mine located in sec. 28, T11N, R8E, MDM, 1.2 km (0.7 mile) NNW of Flagstaff Hill (coordinates of record), N of the headwaters area of Anderson Creek (approximately 5.5 air miles SW of Pilot Hill), on private land. MRDS database accuracy for this location is not stated.

Mineralization is hosted in dunite. Local alteration includes serpentinization, and alteration to talc and magnesite. Associated rocks include pyroxenite. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

The ore body is irregular veins & lenses, strikes N10W, dips 60E at a thickness of 30.48 meters, width of 121.92 meters andf a length of 609.6 meters. The Pillikin deposits occur in a tabular, NNW-trending ultramafic body, ¾ mile wide and 4 miles long, that dips steeply to the E. Local geologic structures include a large fault trending N25E that cuts off the ore-bearing dunite to the S.

Workings include surface openings comprised of an open pit with an overall length od 121.92 meters and an overall width of 121.92 meters (now flooded).

Production data are found in: Cater, F.W., Jr., G.A. Rynearson & D.H. Dow (1951).

Production statistics: Year: 1942 (period = 1940-1942): ore: ^11 weight percent Cr2O3.

Reserve-Resource data are found in: Cater, F.W., Jr., G.A. Rynearson & D.H. Dow (1951).

Analytical data result: The entire ore zone contains 5 to 10% Cr2O3.

Mineral List

7 entries listed. 4 valid minerals.

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Wells, F.G., Page, L.R., and James, H.L. (1940), Chromite deposits of the Pilliken area, El Dorado County, California: USGS Bulletin 922-O: 441-444.

Cater, F.W., Jr., G.A. Rynearson & D.H. Dow (1951), Chromite deposits of El Dorado County, California: California Division Mines Bulletin 134, part 3, Chapter 4: 137-138.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10043678.

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