Latitude: 43°44'49"N
Longitude: 103°43'14"W
An Li-Cs-Be-niobium-tantalum-mica-quartz mine in pegmatite located in secs. 35, 36, T.3S., R.3E., at Fourmile near Custer.
Mineralization is an irregular, L-shaped, zoned pegmatite body in schist.
Workings include 12 open cuts, 2 tunnels and a shaft with 2 levels and stopes.
Mineral List
58 entries listed. 49 valid minerals.
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References
Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, U.S. Bureau of Mines Information Circular 8298: 32 (Table A-1).
Januzzi, R.E. and Seaman, David M. (1976) Mineral Localities Of Connecticut and Southern New York State and Pegmatite Minerals of the World.
Rocks & Minerals: 60: 117-118.
Staatz, M. H.; Page, L. R.; Norton, J. J.; Wilmarth, V. R. (1963) Exploration for beryllium at the Helen Beryl, Elkhorn, and Tin Mountain pegmatites, Custer County, South Dakota. USGS Prof. Paper 297C.
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