South Dakota · Custer County
Past Producer
Triangle A Mine
Custer County, South Dakota, United States
Feldspar
Beryllium
Mica
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USGS source ↗
Commodities
Primary
Feldspar
Tertiary
Beryllium, Mica
Commodity type
B
Economic & production
Development status
Past Producer
Identification
Deposit ID
10177962
Alternate names
Triangle Mine
Region
NA
Data score
D
Coordinates
43.72996, -103.51586
References
USBM STAFF,1955, REG.V, I.C.7707, P.177STATE, S.D.M.I.R., ANNUAL