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Grey Fox Mine (Three Rivers Mine), Cahoon Mountain, Tulare Co., California, USA

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A former W occurrence/mine located in the NE¼ (estimated) sec. 9, T18S, R29E, MDM, 1.5 km (1.0 mile) NW of Cahoon Mountain (coordinates of record), along Cinnamon Creek, on National Forest land. Operated in 1943 and 1955-1956. MRDS database stated accuracy for this location is 500 meters.

Mineralization is hosted in marble and granodiorite. The ore body is vertical at a width of 1.22 meters. The strike of the contact roughly parallels that of the bedding in the marble, N15W with a vertical dip. For intervals along its strike, the marble is cut by strong shear zones following cross-fractures, or cross-fornts (faults ??), which are normal to granite contact. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).

Workings include underground openings with a length of 38.1 meters and comprised of 3 adits to a depth (?) of 125 feet.

Production data are found in: Goodwin, Joseph Grant (1958).

Ore was shipped in 1943. Active again during the period 1955-1956, with no production figures available. Ore grade was 0.5 to 1.5% WO3.

Analytical data results: A zone 3 to 4 feet wide contained 3.5 to 1.0% WO3.

Mineral List

1 entry listed. 1 valid mineral.

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Jenkins, William O. (1943), Tungsten deposits northeast of Visalia, California: California Division Mines (Report 39): 39(2): 178.

Krauskopf, Konrad Bates (1953), Tungsten deposits of Madera, Fresno, and Tulare Counties, California: California Division Mines Special Report 35, 83 pp.: 81.

Goodwin, Joseph Grant (1958), Mines and mineral resources of Tulare County, California: California Journal of Mines and Geology (Report 54): 54(3): 445.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10008682 & 10238828.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061070182.

Mineral and/or Locality  
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