Commodities
PrimaryBeryllium, Mica
TertiaryFeldspar, Quartz
Commodity typeB
Deposit
Deposit sizeS
Orebody formTABULAR
Materials
Ore mineralsBeryl, Muscovite, Quartz
Geology
Host rockGneiss,Amphibolite · Idaho Springs Formation---Plagioclase-Quartz-Biotite Gneiss And Plagioclase-Hornblende Gneiss, And Amphibolite;Pegmatite
Associated rockPegmatite · Pegmatite
StructureFront Range Uplift, Denver Basin, Junction Ranch Fault Zone
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
Identification
Deposit ID10013736
MRDS IDD010194
RegionNA
Data scoreB
Coordinates39.79638, -105.27114
References
SHERIDAN, D.M., AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520 (INCL. GEOLOGIC MAP OF RALSTON BUTTES QUAD)MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 28USBM MIN. EXAM. FILE, REPT. OF 1/26/59 (FROM ORIGINAL CRIB RECORD)