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Durham Mine (Pacific Tungsten Co.), Darwin, Darwin District, Darwin Hills, Inyo Co., California, USA

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A former Tungsten mine located in sec. 19, T19S, R41E, MDM, 1.7 km (1.1 miles) ENE of Darwin, at an altitude of 4640 feet, on private (patented) land. Operated first by the Pacific Tungsten Company 1941 – 1943. Accessible by a jeep-track from the N Main Street, 2.2 road miles (3.52 km) east of Darwin. MRDS database stated accuracy for this locality is 10 meters. Corrected description and position N36.26811 W117.57191 by Richard Muster, courtesy Walt Margerum, Gail Dunning and Robert Hously.

Mine rocks consist of limestone, marble, calc-hornfels and tactite. Local rocks include Carboniferous marine rocks, unit 2 (SE California Carbonate Assemblage).

Workings include surface and underground openings comprised of an inclined shaft 250 feet deep with 4 levels totaling 1,100 feet of drifts and crosscuts. The 100 feet level connects with the bottom of the Fernando Mine. The Fernando Mine and the Durham Mine have been worked for a time as a unit through this connection. The ore was first treated in a mill in the Darwin Wash, then in Bishop. The lower grade wall rock has been mined by subsequent lessees so that the glory hole has a width of approx 50 feet.

Mineral List



10 entries listed. 10 valid minerals.

The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Knopf, Adolph (1914) “The Darwin Lead-Silver Mining District California;” United States Geological Survey Bulletin 580-A, 19 p.

Wilson L. Kenneth (1943), Tungsten deposits of the Darwin Hills Inyo County, California, Economic Geology: 38: 543-560.

Butner, D.W. (1949), Investigation of tungsten occurrences in Darwin district, Inyo County, California: US Bureau Mines Report of Investigation 4475.

Norman, L.A., and Stewart, R.A. (1951), Mines and Mineral Resources of Inyo County, California, California Division of Mines and Geology (Report 47): 47(1).

Hall, Wayne Everett & E.M. Mackevett (1958), Economic geology of the Darwin quadrangle, Inyo County, California: Calif Division of Mines Special Report 51: 64.

Hall, Wayne Everett & Edward M. Mackevett (1963), Geology and ore deposits of the Darwin quadrangle, Inyo County, California: USGS Professional Paper 368: 59, 76, 77.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 106, 107.

Morrison, Greg (1980) Tungsten Occurrences and Potential in the Darwin Hill, Inyo County, California, University of Western Ontario, February, 1980.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 102 (map 3-6), 125-126, 234, 333.

Stolburg, C. S. (1984) “The Mines and Minerals of Darwin, California;" The Mineralogical Record: 15(1): 5-18.

Randol Mining Directory (1990).

Cooper; Fen and Dunning, Gail (2003) : Occasional Publication of the Bay Area Mineralogists, February, 2003.

Margerum, W. (2004) The Darwin Tungsten Area Part II: Mines and Mineralogy in the Bulletin of the Mineralogical Society of Southern California Vol. 74(5).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10187676.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060270700.

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