A beryllium mine in the phosphatic Tip Top pegmatite body.
Located just SW of the center of Sec. 8, T3S, R4E, about 8.5 km SW of Custer.
Ref.:
- Rocks & Minerals: 60: 117.
- Dunn, P.J., Roberts, W.L., Campbell, T.J. & Leavens, P.B. (1983): Red Montgomeryite and associated minerals from the Tip Top Pegmatite with notes on kingsmoutite and calcioferrite. Mineralogical Record 14 (3): 195-197.
- Campbell, T.J. and Roberts, W.L. (1986). Phosphate minerals from the Tip Top mine, Black Hills, South Dakota. Mineralogical Record. 17: 237-254.
- Seaman, 1976. Pegmatite Minerals of the World.
- MATRIX (2002) 10(3): 138-146.
- http://www.dakotamatrix.com/Articles/Tiptop.htm
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Map Reference: 43°42'56"N , 103°40'10"W
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