Bob Ingersoll Mine (Ingersoll Mine; Ben Butler Mine; Horace Greely Mine), Keystone, Keystone District, Pennington Co., South Dakota, USA
Ref.: Dana 7:I:613; Rocks & Min.:10:147 & 60:112,116; Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 33 (Table A-1).
Photo: Peter Hargis
A mica-lithium-feldspar-beryllium-tin-niobium-tantalum mine located in the NE¼ NW¼ sec. 6, T.2S., R.6E.
Mineralization is comprised of 5 zoned pegmatite dikes in quartz-mica schist.
Workings include open cuts, pits and underground development.
44 entries listed. 36 valid minerals.
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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, p. 333-336.
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Locality Updated: Agnew pegmatite, Custer District, Custer Co., South Dakota, USAFrom Chester S. Lemanski, Jr., 9th Mar 2014 22:58:22