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Comet Mine, Jerseydale, Jerseydale District, East Belt, Mariposa Co., California, USA

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A former lode Au mine located in the SE¼ sec. 22, T4S, R19E, MDM, 1.3 km (4,300 feet) ENE of Jerseydale, along an unnamed fork/tributary of Skelton Creek, on National Forest land. Property consisted of 3 unpatented claims. Operated in 1918. Operated by T. A. Clarke. MRDS database stated accuracy for this location is 500 meters.

Mineralization is vein deposit with 2 veins averaging 2½ feet thick, hosted in granite, quartzite and slate. The ore body strikes NW and dips 85NE. The 2 veins occur on a contact between a granite & quartzite footwall, and a slate hanging wall. Local rocks include Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada).

Workings include unspecified surface openings/operations and underground openings comprised of 2 levels. The lower level is 750 feet and the upper one is 285 feet. The lower level has a 100 foot crosscut and a 40 foot raise. There is a raise 168 feet to the surface from the upper level, and a winze 45 feet deep.

Production data are found in: Castello (1920).

The ore was aaid to average $8.00/ton (1920 values).

Analytical data results: 2½% sulfides.

Mineral List

2 entries listed. 2 valid minerals.

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Castello, W.O. (1921), Mariposa County: California Mining Bureau. Report 17: 111-112.

Bowen, O.E., Jr. & C.H. Gray, Jr. (1957), Mines and mineral deposits of Mariposa County, California: California Journal of Mines and Geology (Report 53): 53(1&2): 251.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10031248 & 10163859.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060430638.

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