Ref.: 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).
Seaman (1976), Pegmatite Minerals of the World.
Rocks & Minerals: 60: 117-118.
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.
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Map Reference: 43°44'49"N , 103°43'14"W
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