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Bruce Mine (Bruce group; Bruce prospect), Darwin, Darwin District, Darwin Hills, Inyo Co., California, USA

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A former W mine located in SW¼ sec. 18, T19S, R41E, MDM, 5830 feet N28°E of Darwin (1.7 km (1.1 miles) NNE), at 4,850 feet of altitude. The mine is owned by The Anaconda Company and was leased to A. J. Pouch and "Frenchie" Lingsley of Darwin in 1955. The MRDS database stated accuracy for this locality is 100 meters. A steep jeep track leads from the N. Main Street to the mine. Updated description and position of the mine N36.28216 W117.58246 by Richard Muster, based on observations in 2007. It is argued by some that the Wonder mine and the Bruce mine are one unit but Hall, Wayne Everett & E.M. Mackevett list them as separate mines.

A W deposit hosted in calc-hornfels and tactite. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).

The workings include surface and underground openings comprised of 2 adits, about 80 and 100 feet long, and an open cut 50 feet long, 10 feet wide, and about 15 feet deep.

Scheelite was first described in the Darwin Hills by Hess and Larsen (1922, p268). Kelley (1938, p543) mentioned Scheelite at the Bruce mine in the Darwin Hills, but the Tungsten deposits in the Darwin Hills remained undeveloped until 1940 when Tungsten was in high demand because of WW II.

Assay results: 2.25% W, 1% Cu and traces of Mo were reported.

Mine dump at: N36.28116 W117.58068
Workings also at: N36.28154 W117.58234 and N36.28185 W117.58237.

Mineral List

10 entries listed. 8 valid minerals.

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Kelley, Vincent Cooper (1938), Geology and ore deposits of the Darwin silver-lead mining district, Inyo County, California: California Division Mines (Report 34): 34: 543, 559.

Hall, Wayne Everett & E.M. Mackevett (1958), Economic geology of the Darwin quadrangle, Inyo County, California: California Division of Mines Special Report 51: 63.

Lemmon, Dwight Moulton and Tweto, O.L. (1962) Tungsten in the United States, exclusive of Alaska and Hawaii. USGS Mineral Investigative Resources Map MR-25.

Hall, Wayne Everett & Edward M. Mackevett (1963), Geology and ore deposits of the Darwin quadrangle, Inyo County, California: USGS Professional Paper 368: 53.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 102 (map 3-6).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10139372.

Mineral Availability System (MAS) database file #0060270023.

Lemmon, D.M., Tungsten deposits in the US; Vol. I, unpublished data: 244-245.

External Links

http://pubs.usgs.gov/pp/0368/report.pdf (Hall, Wayne Everett & Edward M. Mackevett (1963),)

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