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Helen Beryl Mine (Sweepstakes Beryl; Big Tom claim; Kem claim), Fourmile, Custer District, Custer Co., South Dakota, USA
Quality of samples:
not specified / average specimens
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.
Click here to view Chlorite Group data
Click here to view Helen Beryl Mine (Sweepstakes Beryl; Big Tom claim; Kem claim), Fourmile, Custer District, Custer Co., South Dakota, USA
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Current server date and time: December 13, 2013 17:43:59
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Oakland Mine (Oakland Copper Mine), Whaleback Ridge, Tulare Co., California, USA
Chester S. Lemanski, Jr.
, 13th Dec 2013 17:35:54