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Foss prospect (Skaggs), South Dubakella Mountain, Upper Hayfork Creek area, Klamath Mts, Trinity Co., California, USA

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A Mn occurrence located in sec. 16, T29N, R11W, MDM, 3.9 km (2.4 miles) ESE of South Dubakella Mountain, on a steep hillside of the N slopes of Dubakella Creek, an E-flowing fork of the headwaters of Hayfork Creek, on private land in a National Forest (private lease). Discovered 1918. The lessee/operator was the Noble Electric Steel Co. (1974). Owned by Fred Foss, California (1974)(private lease). MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is hosted in chert. A dense black chert belt several yards wide is heavily stained with Mn oxide. A small amount of limonite is mixed with oxides near the surface. Psilomelane occurs as bands, selvedges on fracture planes, and small veinlets in the chert. White quartz veinlets carrying pyrite cut through dark green chert. Local rocks include Paleozoic marine rocks, undivided, unit 9 (Western Klamath Mountains).

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.


Averill, Charles V. (1941), Mineral resources of Trinity County: California Journal of Mines and Geology, California Division Mines (Report 37): 37(1): 68.

Trask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California – a summary report: California Division Mines Bulletin 125: 198.

Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 315, 317.

Trengrove, Russell R. (1960), Reconnaissance of California Manganese Deposits, U.S. Bureau of Mines Report of Investigation 5579: 15.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10033688 & 10141399.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061050033.

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