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Black Horse prospect, Wheeler Peak, Patterson District, Sweetwater Mts (Sweetwater Range), Mono Co., California, USA

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A Mn occurrence/prospect located in the N½ sec. 8, T6N, R25E, MDM, 4.9 km (3.0 miles) SE of Wheeler Peak (coordinates of record), on National Forest land (located claim). Discovered in 1940. Owned by R. J. Thomas and Bert Davis (1974). MRDS database stated accuracy for this location is 500 meters.

Mineralization is hosted in andesite, sedimentary breccia and tuff (volcanic breccia [agglomerate]). The ore body is 0.1 meters thick. Psilomelane stringers 1 to 4 inches thick in a crystal lithic andesitic tuff and breccia (dacite ?). General trend of the stringers is NW-SE, dipping SW. Some manganite may be present. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).

Workings include surface and underground openings comprised of a 15 foot deep, 28 foot long, 4 foot wide cut with a shaft started at the end. Another cut is caved. There is also a 15 foot tunnel.

No production recorded.

Mineral List

2 entries listed. 1 valid mineral.

The above list contains all mineral locality references listed on 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 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.


Trask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California – a summary report: California Division Mines Bulletin 125: 143.

Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 150-151.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10236793.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060510003.

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