| | Report (issue) | STATE OF SOUTH DAKOTA Nils Boe, Governor MINERALOGY OF THE BLACK HILLS by WILLARD LINCOLN ROBERTS...Associate in Mineralogy Museum of Geology, South Dakota School of Mines and Technology and GEORGE RAPP...Department of Geology and Geological Engineering, South Dakota School of Mines and Technology With the Editorial...Mineralogy South Dakota School of Mines and Technology BULLETIN NUMBER 18 of the South Dakota School of...of Mines and Technology Rapid City, South Dakota PUBLICATIONS STAFF F. L. Partlo J. T. Thomas President | | 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. Professional Paper 297c. US Geological Survey doi:10.3133/pp297c | Report (issue) | at the Helen Beryl, Elkhorn and Tin Mountain Pegmatites Custer County, South Dakota GEOLOGICAL SURVEY PROFESSIONAL...at the Helen Beryl, Elkhorn and Tin Mountain Pegmatites Custer County, South Dakota By MORTIMER H. STAATZ...Beryl pegmatite _____________________________ _ Mine workings ________________________________ _ Production...161 161 162 162 Page Elkhorn pegmatite _________________________________ _ Mine workings ___________...Mountain pegmatite ____________________________ _ Mine workings ________________________________ _ Geology |
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