An open-cast Be mine located just SW of the center of Sec. 8, T3S, R4E, about 8.5 km SW of Custer.
Mineralization is in the primary and secondary phosphate-bearing Tip Top granite pegmatite body.
References:
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.
Rocks & Minerals (1985): 60: 117.
Campbell, T.J. and Roberts, W.L. (1986). Phosphate minerals from the Tip Top mine, Black Hills, South Dakota. Mineralogical Record. 17: 237-254.
Thomas A. Loomis & Thomas J. Campbell (2002) The Tip Top pegmatite A Historical Review and Mineralogical Update MATRIX: 10(3): 138-146.
www.dakotamatrix.com/Articles/Tiptop.htm
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Map Reference: 43°42'56"N , 103°40'10"W
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Mineral List:104 entries listed. 92 valid minerals. 12 type localities (valid minerals). 4 erroneous literature entries.
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