|Latitude & Longitude (WGS84):||43° 42' 56'' North , 103° 40' 9'' West|
|Latitude & Longitude (decimal):||43.71556,-103.66944|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
A former Be occurrence/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.
Note: Many early reported phosphate species from this locality have been re-identified, particularly regarding manganese, iron, or magnesium end-members. Old references may be at variance with modern nomenclature. Both Campbell, T.J. and Roberts, W.L. (1986) and Loomis, T.A. and Campbell, T.J. (2002) are definitive statements as to species identification.
Workings include surface openings comprised of a large open-cast mine pit.
96 valid minerals. 12 (TL) - type locality of valid minerals. 4 erroneous literature entries.
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Dunn, P.J., Roberts, W.L., Campbell, T.J., and Leavens, P.B. (1983) Red Montgomeryite and associated minerals from the Tip Top Pegmatite with notes on kingsmountite and calcioferrite. Mineralogical Record: 14 (3): 195-197.
Grice, Joel D., Peacor, Donald R., Robinson, George W., van Velthuizen, Jerry, Roberts, Willard L., Campbell, Thomas J., and Dunn, Pete J. (1985) Tiptopite (Li,K,Na,Ca,)8Be6(PO4)6(OH)4, a new mineral species from the Black Hills, South Dakota. The Canadian Mineralogist: 23: 43–46.
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.
Canadian Mineralogist (1989) 27: 699-702.
Moore, P.B. (2000) Analyses of Primary Phosphates from Pegmatites in Maine and Other Localities, in V.T. King (editor), Mineralogy of Maine. Mining History, Gems, and Geology. Maine Geological Survey, Augusta, Maine: 333-336.
Loomis, Thomas A. and Campbell, Thomas J. (2002) The Tip Top pegmatite, A Historical Review and Mineralogical Update. MATRIX: 10(3): 138-146.
Tait, K.T., Barkley, M.C., Thompson, R.M., Origlieri, M.J., Evans, S.H., Prewitt, C.T., and Yang, H. (2011) Bobdownsite, a new mineral species from Big Fish River, Yukon, Canada, and its structural relationship with whitlockite-type compounds. Canadian Mineralogist: 49: 1065-1078.