Commodities
PrimaryBeryllium, Mica, Feldspar
SecondaryREE
Commodity typeB
Materials
Ore mineralsAllanite, Beryl, Microcline, Monazite, Muscovite
GangueGarnet, Magnetite, Tourmaline
Geology
Host rockGneiss · Pegmatite;Idaho Springs Formation---Interlayered Feldspar-Rich Gneiss, Hornblende Gneiss, Amphibolite, Biotite Gneiss
Associated rockPegmatite · Pegmatite
StructureFront Range Uplift, Denver Basin, Blackhawk Fault, Unnamed Syncline
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
Identification
Deposit ID10013728
MRDS IDD010185
Alternate namesRoscoe Gulch Pegmatite
RegionNA
Data scoreB
Coordinates39.74721, -105.37336
References
SHERIDAN, D.M., AND OTHERS, 1972, GEOLOGIC MAP OF THE EVERGREEN QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-786-AMEEVES, 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 6/1/59 (FROM ORIGINAL CRIB RECORD)