OlmsteaditeWhite Cap Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA
Latitude: 43°52'45"N
Longitude: 103°24'20"W
A pegmatite mine located in the NE¼ sec. 16, T.2S., R.6E.
Mineralization is an irregular, zoned pegmatite body in mica schist.
Workings include 2 large, open cuts.
Commodities (Major) - Mica, Feldspar, Beryllium; (Trace) - Lithium
Development Status: Past Producer
Host Rock: Mica Schist
Mineral List
45 entries listed. 36 valid minerals. 3 erroneous literature entries.
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References
Rocks & Min.: 60: 112; R&M 75:3 pp 156-169;
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).
Deposit:: USBM INFO CIRC 7707, P. 75-76.
Deposit:: ROBERTS, W. L., AND RAPP, GEORGE, 1965, MINERALOGY OF THE BLACK HILLS, SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY BULLETIN 18.
Production:: USBM INFO CIRC 7707, P. 76.
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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