Commodities
PrimaryFeldspar, Mica, Quartz, Beryllium
SecondaryNiobium (Columbium), Tantalum, Bismuth
Commodity typeB
Materials
Ore mineralsFeldspar, Muscovite, Quartz, Beryl
Other materialsBiotite, Magnetite, Lepidolite, Cleavelandite, Amblygonite
Geology
Associated rockPegmatite,Quartz Diorite,Gneiss,Granodiorite
Economic & production
Development statusPast Producer
Identification
Deposit ID10311023
RegionNA
Data scoreB
Coordinates38.47445, -105.3164
References
Hanley, J.B., Heinrich, E.W., and Page, L.R., 1950, Pegmatite investigations in Colorado, Wyoming, and Utah, 1942-1944: U.S. Geological Survey Professional Paper 227, 123 p.Martin, Clay M., 1993, Reconnaissance investigations of selected columbium and tantalum occurrences in Colorado: U.S. Bureau of Mines Open File Report 17-93, 103 p., appendicesArgall, G.O. Jr., 1949, Industrial minerals of Colorado; Quarterly of the Colorado School of Mines, volume 44, No.2Heinrich, E.W., 1948, Geologic map of Eight Mile Park, Fremont County, Colorado: American Mineralogist, v. 33, no. 7-8, Fig. 2.