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St. Charles Mine, Darwin, Darwin District, Darwin Hills, Inyo Co., California, USA

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Latitude & Longitude (WGS84): 36° 16' 22'' North , 117° 34' 34'' West
Latitude & Longitude (decimal): 36.27278,-117.57611
GeoHash:G#: 9qkqk7r8n
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate

A former W mine located 1.4 km (0.9 mile) ENE of Darwin, on the North side of a steep canyon, locally called Custer Canyon. Operated during the period 1950–1955; re-opened in 1960 for a short time. MRDS database stated accuracy for this location is 10 meters. Corrected description and position N36.27283 W117.57615 by Richard Muster, courtesy Gail Dunning, Walt Margerum and Robert Hously.

Rocks in the mine area are interbedded calc-hornfels in part recrystallized to marble and altered to tactite containing veins of scheelite. Local rocks include Carboniferous marine rocks, unit 2 (SE California Carbonate Assemblage).

Workings include underground openings comprised of 3 separate workings, Nos. 1-3, with a 140 foot inclined shaft with drifts and crosscuts and 4 adits. High grade Scheelite was found in the inclined shaft. Only low grade Scheelite was found in the adits. No. 3 adit that was dug to explore for Ag & Pb.

Mineral List

21 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Quaternary - Miocene
0 - 23.03 Ma

ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Cisuralian - Mississippian
272.3 - 358.9 Ma

ID: 2908410
Carboniferous marine rocks, unit 2 (SE California Carbonate Assemblage)

Age: Paleozoic (272.3 - 358.9 Ma)

Stratigraphic Name: Anvil Spring Formation; Bird Spring Formation; Tihvipah Limestone; Monte Cristo Limestone; Santa Rosa Hills Limestone; Perdido Group; Stone Canyon Formation; Tin Mountain Limestone; Indian Springs Formation

Description: Shale, sandstone, conglomerate, limestone, dolomite, chert, hornfels, marble, quartzite; in part pyroclastic rocks

Comments: Southeastern California carbonate assemblage (eastern Mojave Desert and southeastern Death Valley area). Consists primarily of limestone with minor siltstone and sandstone.Includes some rocks of Early Permian age,

Lithology: Major:{limestone}, Minor:{sandstone,siltstone mudstone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

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.


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Knopf, Adolph (1914) The Darwin Lead-Silver Mining District California, USGS 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) (January 1951).
Hall, Wayne Everett & E.M. Mackevett (1958), Economic geology of the Darwin quadrangle, Inyo County, California: Calif Division of Mines Special Report 51: 65.
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, 137, 234, 333.
Stolburg, C. S. (1984) The Mines and Minerals of Darwin, California, The Mineralogical Record: 15(1): 5-18.
Randol Mining Directory (1990).
Dunning, G.E., Moelo, Yves, Roberts, A.C., & Cooper, J. F (2000), Ag-Cu-Pb-Bi Sulfosalts New To Darwin, Inyo County, California. Occasional Web Publication of the Bay Area Mineralogists, 2000.
Dunning, Gail E., Yves MoÎlo, and Joseph F. Cooper, Jr. (2000), Ag-Cu-Pb-Bi Sulfosalts New to Darwin, Inyo County, California.
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 #10163554.
Mineral News: 16(9): 1.
Mineral Availability System (MAS) database file #0060271926.

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