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Hammer property (Kammer property; South Fork Gold and Platinum Mining Company), Salyer, Willow Creek District, Klamath Mts, Trinity Co., California, USA

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A former placer PGE (Pt-Os-Ir)-Au occurrence/mine located in secs. 14 & 15, T6N, R5E,HM, 0.9 km (3,000 feet) W of Salyer along the main channel Trinity River, E of its confluence with the South Fork Trinity River (covers 7/8 mile of stream), on National Forest land. Operated by P. P. Hammer (1918). MRDS database stated accuracy for this location is 10,000 meters (sic).

NOTE: This locality is listed as the Hammer property in the USGS MRDS database; whereas, Pemberton (1983) presents it as the Kammer property.

Mineralization is a placer Au-PGE deposit (Deposit model: Model code 119; USGS model code 39a; BC deposit profile C01. C02; model name: Placer Au-PGE; Mark3 model number 54), hosted in Holocene gravels. The ore body is a stream sediment deposit at a thickness of 14.33 meters. Controls for ore emplacement
were stream hydraulics. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).

Related tectonic structures include: Klamath Mountains Accreted Terrane.

Workings included surface hydraulic operations over an area of 358.16 hectares. Actual mining took place on benches above the stream level.

Production data are found in: Logan (1918).

Production information: Other grade range of 0.0026-0.0065 ounces/ton PGE (90-220 ppb). Au also reported. PGE was coarser than expected and contains a large proportion of Osmiridium.

Analytical data results: Pt:Au = 4 ounces/$1,000 (1:12.09) at one place (Logan, P. 87).

Mineral List

3 entries listed. 2 valid minerals.

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.


Logan, Clarence August (1918), Platinum and allied metals in California: California Mining Bureau. Bulletin 85, 120 pp.: 86-87.

Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 143-144.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 39, 44.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109530.

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