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Jasper prospect, Keystone, Tuolumne Co., California, USA

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A Mn occurrence/prospect located in the NE¼ sec. 23 & in the NW¼ sec. 24, T1S, R13E, MDM, 0.9 km (2,800 feet) ENE of Keystone. Owned by E. M. Jasper, California (1974). MRDS database accuracy for this location is not stated.

Mineralization is a Mn deposit. Banded quartzite (probably metachert) is cut by quartz veins up to 6 inches (15 cm) thick. Manganese stains occur along fractures, and a 1 foot (30 cm) thick zone is partially penetrated by manganese oxides. The quartzite is enclosed in quartz mica schist which strikes N65W and dips 60NE. A serpentine belt lies ½ mile to the NE with green meta-volcanics containing manganese oxide stains along fractures. Rocks strike N40W and dip 70NE. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).

Workings include unspecified surface openings/operations.

Analytical data results: Probably less than 10% Mn.

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1 entry listed.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Trask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California – a summary report: California Division Mines Bulletin 125: 207.

Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 344.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033741 & 10141730.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061090004.

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