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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).
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.
Mineral List
44 entries listed. 36 valid minerals.
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References
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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New Locality Added: Lautakoski, Pajala, Norrbotten, SwedenFrom Aksel Österlöf, 18th May 2013 10:44:43