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Bowman Mine (Boman), Grizzly Gulch, Pike District, Sierra Co., California, USA

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Latitude & Longitude (WGS84): 39° 26' 41'' North , 120° 56' 39'' West
Latitude & Longitude (decimal): 39.4447212219, -120.944168091
A former Au-Ag occurrence/mine located in the NE¼NE¼ sec. 10, T18N, R9E, MDM, 2.5 km (1.6 miles) ESE of Grizzly Gulch (townsite), about 2.5 km ENE of Pike, along the W ridge of Grouse Creek (6 miles WSW of Alleghany), on National Forest land. MRDS database stated accuracy for this location is 100 meters.

Mineralization is a vein deposit. The quartz vein strikes N30-40W in highly weathered metamorphic rocks. Local rocks include Paleozoic marine rocks, undivided, unit 6 (Northwestern Sierra Nevada).

Workings include surface openings comprised of a 1,200 foot trench.

Production data are found in: U. S. Bureau of Mines Minerals Yearbook for 1944 (1945), Volume 3.

Production statistics: Year: 1944: Ore (accurate): ^0.33 ounce (9 grams)/ton Au; 0.038 ounce (1 gram)/ton Ag.

For 180 tons of ore, 60 ounces Au and 7 ounces Ag were extracted in 1944. No other production record was found. Production in 1944 was small.

Mineral List

2 entries listed. 2 valid minerals.

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U. S. Bureau of Mines Minerals Yearbook for 1944 (1945), Volume 3.

McCulloch, W.C., Oesterling, W.A., Spurck, W.H., & Tischler, M.S. (1964), Minerals for Industry, Northern California, Southern Pacific Company: Vol. II: (reprint: California Division of Mines and Geology Special Publication 94, 1987): 34.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10086504 & 10141181.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060910016.

Mineral and/or Locality  
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