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White Cap Mine (King Mica Mine; Primer lode), Keystone, Keystone District, Pennington Co., South Dakota, USA

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Latitude & Longitude (WGS84): 43° 52' 45'' North , 103° 24' 20'' West
Latitude & Longitude (decimal): 43.8791666667, -103.405555556
A former pegmatite (mica-feldspar-Be-Li) occurrence/mine located in the NE¼ sec. 16, T2S, R6E, M, on National Forest land. MRDS database stated accuracy for this location is 100 meters.

Mineralization is an irregular, zoned pegmatite body in mica schist. Local rocks include Metagraywacke.

Workings include surface openings comprised of 2 large, open cuts.

Production data are found in: U.S. Bureau of Mines Information Circular IC-7707, p. 76.

Mineral List

45 entries listed. 36 valid minerals. 3 erroneous literature entries.

The above list 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.


U.S. Bureau of Mines (1955), Information Circular IC-7707, p. 75-76.

Norton, James J. (1964) Pegmatites and other Precambrian Rocks in the Southern Black Hills; Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota. USGS Professional Paper 297E: 337-340.

Roberts, W. L., nd Rapp, George (1965), Mineralogy of the Black Hills, South Dakota School of Mines and Technology Bulletin 18.

Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, U.S. Bureau of Mines Information Circular IC-8298: 33 (Table A-1).

Rocks & Minerals (1985): 60: 112.

Rocks & Minerals (2000): 75(3): 156-169.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10129201.

Loomis, T. (2011), News from the Black Hills, South Dakota. Mineral News (2011): 27(11): 4-5, 8.

U.S. Bureau of Mines, Minerals Availability System (MAS) file #0461030233.

Roberts and Rapp, "Mineralogy of the Black Hills," South Dakota SMT, Bulletin 18.

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