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USA | |
| Redden, Jack Allison (1959) Beryl deposits of the Beecher No.3 Black Diamond pegmatite, Custer County, South Dakota. USGS Bulletin: 1072- |
| Wilmarth, V. R. (1963) Exploration for beryllium at the Helen Beryl, Elkhorn, and Tin Mountain pegmatites, Custer County, South Dakota. USGS Prof. Paper 297C. Page, Lincoln R., Stocking, Hobart E., Smith, Harriet B. (1956) Contributions to the geology of uranium and thorium by the United States Geological Survey and Atomic Energy Commission for the United Nations International Conference on Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955. Professional Paper 300. US Geological Survey doi:10.3133/pp300 Staatz, M. H. Norton, J. J. |
| USGS Prof Paper 297D |
| USGS Bull 1063F |
| Carr,Martha S. and Dutton,Carl E. (1955) Iron -Ore Resources of the United States ,Including Alaska and Puerto Rico USGS Bulletion 1082-C |
| USGS Prof Paper 297D |
- Unorganized mining district [1]
| Roberts, Willard Lincoln, Rapp, George Jr. (1965) Mineralogy of the Black Hills. Bulletin 18. South Dakota School of Mines and Technology |