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

Latitude: 36°16'55"N
Longitude: 117°34'56"W

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A former W mine, 5830 feet N28°E of Darwin in SW quarter of sec. 18 T19S R41E MDM at 4850 feet. A steep jeep track leads from the N. Main Street to the mine.

The mine is owned by The Anaconda Company and was leased to A. J. Pouch and "Frenchie" Lingsley of Darwin in 1955. The workings consist of 2 adits about 80 and 100 feet long and an open cut 50 feet long, 10 feet wide, and about 15 feet deep. The rocks in the mine area are calc-hornfels and tactite.
2.25% Tungsten, 1% Copper and traces of Molybdenum were reported.

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.

It is argued by some that the Wonder mine and the Bruce mine are one unit but Hall, Wayne Everett & E.M. Mackevett list it as separate mines.

Updated description and position of the mine N36.28216 W117.58246 by Richard Muster, based on observations in 2007.

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

In the Lane Canyon are the following mines :
Wonder Mine
Bruce Mine
Standard Extension Mine
Santa Ana Mine
Lane Mine
Jackass Mine

Mineral List

Calcite
Chalcopyrite
Chrysocolla

Cuprite
Fluorite
'Garnet'

Limonite
Malachite
Pyrite

Scheelite

10 entries listed. 8 valid minerals.

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References

California Journal of Mines and Geology (1938) Vol. 34, p543, 559.

Hall, Wayne Everett & E.M. Mackevett (1958), Economic geology of the Darwin quadrangle, Inyo County, California: Calif. Division of Mines Special Report 51, p63.

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, p53.

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

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 I, unpublished data: 244-245.

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

Mineral Availability System (MAS) database file # 0060270023.

External Links

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

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Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: 15th Oct 2012 09:06:22