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Graves group (Summit), Bohemotash Mountain, Backbone District, West Shasta Copper - Zinc District, Klamath Mts, Shasta Co., California, USA

Latitude: 40°46'56"N
Longitude: 122°28'15"W

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A former Cu mine located in sec. 30, T34N, R5W, MDM, 0.4 km (1,500 feet) ESE of Bohemotash Mountain (coordinates of record), on National Forest land. MRDS database accuracy for this location is not stated.

Mineralization is hosted in rhyolite. The ore body dips NW at 10.67 meters thick and 731.52 meters long. Local rocks include Paleozoic metavolcanic rocks, unit 1 (Eastern Klamath Mountains).

Workings include underground openings with a total length of 365.76 meters. They are comprised of 3 tunnels, one at 400 feet long with a 350 foot raise. The first 90 feet of tunnel No. 1 courses through a secondary deposition caused by leaching of the ore body. The next 50 feet courses through the quartzite footwall with numerous seams bearing sulphide ore. Ore found in tunnel No. 3 is in a disseminated state.

No production reported.

Assay data results: Ore from tunnel No. 1 assayed at 6-14½% Cu.

Mineral List

Chalcopyrite

Pyrite

2 entries listed. 2 valid minerals.

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References

Aubury, Lewis E. (1908), The copper resources of California: California Mining Bureau. Bulletin 50: 97-99.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033835.

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Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the 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 hundreds 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: 15th Jun 2012 13:11:07