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

Latitude: 37°34'5"N
Longitude: 119°50'33"W

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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

Gold

Quartz

2 entries listed. 2 valid minerals.

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References

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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Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: 19th May 2013 14:52:22