Commodities
PrimaryBeryllium, Mica, Feldspar
Commodity typeB
Materials
Ore mineralsChrysoberyl, Muscovite
GangueQuartz
Geology
Host rockGneiss,Amphibolite · Idaho Springs Formation---Interlayered Amphibolite And Biotite-Plagioclase-Quartz Gneiss;Pegmatite
Associated rockPegmatite · Pegmatite
StructureFront Range Uplift, Denver Basin, Junction Ranch Fault Zone
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusOccurrence
Identification
Deposit ID10094626
MRDS IDD010187
RegionNA
Data scoreB
Coordinates39.7886, -105.34864
References
SHERIDAN, D,M,M AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520 (INCLUDES GEOLOGIC MAP OF RALSTON BUTTES QUAD).HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-44: USGS PROF. PAPER 227, P. 85.USGS COMMODITY FILE: GRP III, REEL 32, 1944; GR III, REEL 40, 1943; GR II, REEL 12, DOC. 2701, 1946 (FROM ORIGINAL CRIB RECORD)