Barker-Ferguson Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA
41 entries listed. 35 valid minerals. 1 type locality (valid mineral).
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Norton, James J. (1964) Pegmatites and other Precambrian Rocks in the Southern Black Hills; Geology and mineral deposits of some pegmatites in the southern Black Hills, South Dakota. USGS Professional Paper 297E.
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