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Defiance Mine, Darwin Mine (Anaconda; Bernon Mine; Defiance Mine; Essex Mine; Independence Mine; Intermediate Mine; Rip Van Winkle Mine; Thompson Mine), Darwin, Darwin District, Darwin Hills, Inyo Co., California, USA

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Latitude & Longitude (WGS84): 36° 16' 54'' North , 117° 36' 33'' West
Latitude & Longitude (decimal): 36.2816666667, -117.609166667

A former Ag-W-Au-Cu-Zn-Pb mine located in the SW¼ sec. 13 & in sec. 14 (?), T19S, R40E, MDM, 2.3 km (1.4 miles) NW of Darwin. MRDS database stated accuracy for this location is 1,000 meters.

NOTE: This is one of several mines incorporated into the "Darwin Mine" of the Anaconda Corp. It was also later incorporated into the group termed the "Darwin Mines," owned by Mexicanus Colorado Inc.

In 1945 The Anaconda Co. purchased the Bernon Defiance, Driver, Essex, Independence, Lane, Lucky Jim, Promontory, Rip Van Winkle and Thompson mines, and other small properties In the Darwin quadrangle and the Columbia mine at the south end of the Darwin Hills in the Coso Peak quadrangle, and they have operated some of them from 1945 to 1955.

The Company „Project Darwin LLC“ acquired the Darwin mines and 58 patented mining claims in 1996. The company is looking for investors to re-start the Darwin mines.

Local rocks include Quaternary alluvium and marine deposits.

Workings include unspecified underground openings.

Mineral List

32 valid minerals.

This page contains all mineral locality references listed on 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 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.


Knopf, Adolf (1914a), The Darwin silver-lead mining district, California: USGS Bulletin 580: 1-18; […(abstract): Geol. Zentralbl., Band 21: 597]: 7, 12, 17.

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

Murdoch, Joseph & Robert W. Webb (1942), Notes on some minerals from southern California, III: American Mineralogist: 27: 323, 324.

Rocks & Minerals (1948): 23: 833.

Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124pp.: 250.

Hall, Wayne Everett & Edward M. Mackevett (1963), Geology and ore deposits of the Darwin quadrangle, Inyo County, California: USGS Professional Paper 368: 62, 63, 64.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 89, 96, 112, 217, 223, 244, 342, 355.

Mueller, W.H.T. (1974) The mineralogy, geology and paragenesis of the 1208 oxide stope, Defiance workings, Darwin mine, Darwin, California. Unpublished Master’s thesis, University of California, Riverside: vi, 46, 47.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 52, 100 (photo 3-2), 165 (photo 4-3), 166 (photo 4-4), 285, 299, 302 (photo 8-10), 439, 513.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10211828.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060270305.

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