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Fernando Mine (St. Charles; Hayward; Darwin Silver project; Fernando and St Charles), Darwin, Darwin District, Darwin Hills, Inyo Co., California, USA

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Latitude & Longitude (WGS84): 36° 16' 4'' North , 117° 34' 25'' West
Latitude & Longitude (decimal): 36.2677777778, -117.573611111

A former W mine located in sec. 19, T19S, R41E, MDM, 1.5 km (1.0 mile) E of Darwin, at an altitude of 4690 feet, on private (patented) land. The property consists of 2 patented claims that are adjacent to the Durham Mine. Owned and operated by Quintana Minerals Corp. (100%), California (1990). MRDS database stated accuracy for this location is 100 meters. Corrected description and position N36.26776 W117.57372 by Richard Muster, courtesy Gail Dunning, Walt Margerum and Robert Hously.

Both mines are accessible by the same jeep-track from the N Main Street, 2.2 miles (3.52 km) east of Darwin (1 mile as the crow flies). The Fernando Mine and the Durham Mine have been worked for a time as one unit.

The older claim was worked for Pb & Ag in 1919 and 1920 and it consists of an inclined shaft 125 feet deep. It is located N of the Tungsten portal. The newer tungsten mine operated in the 1940’s and 1950’s with low grade scheelite.

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

Workings include underground openings. An inclined shaft connects with the 100 feet level of the Durham Mine. The newer workings are comprised of 3 adits with about 1,850 feet of drifts and crosscuts, The intermediate level 230 feet above zero level, and the Alameda glory hole (about 100 feet wide) have 310 feet of drifts and crosscuts.

The minerals can be found both on the dump and in the Fernando mine.

Mineral List

12 valid minerals.

Regional Geology

This 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 data will improve over time as more accurate maps and data sets are added.

Jurassic - Cambrian145 - 541 MaCambrian-Jurassic sedimentary


Permian - Carboniferous252.17 - 358.9 MaCarboniferous-Permian sedimentary rocks

Sedimentary rocks

Cisuralian - Mississippian272.3 - 358.9 MaCarboniferous marine rocks, unit 2 (SE California Carbonate Assemblage)

Major:: {limestone},Minor:: {mudstone},Incidental:: {sandstone}

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

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,

References for regional geology:

Data provided by Macrostrat.org

Garrity, C.P., and Soller, D.R.,. Database of the Geologic Map of North America: adapted from the map by J.C. Reed, Jr. and others (2005). U.S. Geological Survey Data Series 424 .

USGS compilers. State geologic map data. State Maps.

Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.

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.


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: U.S. Bureau of 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: 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.

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).

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.

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 #10139200.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060270030.

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