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Tin Mountain Mine, Fourmile, Custer District, Custer Co., South Dakota, USA

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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. 48 valid minerals.

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.

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.

Mineral and/or Locality  
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