Commodities
PrimaryBeryllium, Feldspar, Mica
SecondaryREE, Niobium (Columbium), Tantalum
TertiaryThorium
Commodity typeB
Deposit
Deposit sizeS
Orebody formTABULAR
Materials
Ore mineralsBeryl, Columbite, Euxenite, Microcline, Muscovite, Tantalite
GangueBiotite, Garnet, Thorite
Geology
Host rockGneiss · Idaho Springs Formation---Feldspar-Rich Gneiss
Associated rockPegmatite · Pegmatite
StructureFront Range Uplift, Denver Basin, Floyd Hill Fault Zone, Unnamed Anticline
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
First production1944
Last production1956
Identification
Deposit ID10013726
MRDS IDD010182
Alternate namesRainbow Hills Pegmatite, Wasson Ranch Pegmatite
RegionNA
Data scoreB
Coordinates39.70332, -105.31475
References
BOOS, M.F., 1954, GENESIS OF PRECAMBRIAN PEGMATITES IN THE DENVER MOUNTAIN PARKS AREA, COLORADO: GSA BULL., V. 65, P. 115-142SHERIDAN, D.M., AND OTHERS, 1972, GEOLOGIC MAP OF THE EVERGREEN QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-786-A.MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 29.USBM MIN. EXAM. FILE, REPT. OF 6/1/59 (FROM ORIGINAL CRIB RECORD)ORIGINAL CRIB RECORD (PROBABLY USBM REFERENCE)