Latitude: 43°52'16"N
Longitude: 103°25'30"W
A potassic feldspar mine in pegmatite located in the NE¼ sec. 17, T.2S., R.6E., one mile SSW of Keystone.
Mineralization is an irregular, zoned pegmatite body in quartz-mica-staurolite schist.
Workings include open pits, glory holes and underground development.
Mineral List
46 entries listed. 39 valid minerals. 1 type locality (valid mineral).
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References
Rocks & Min.: 10:147; 60:110,112 & 116; 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: 32 (Table A-1).
Norton, J. J.; Page, L. R.; Brobst, D. A. (1962) Geology of the Hugo pegmatite, Keystone, South Dakota. USGS Prof Paper 297B
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