Commodities
PrimaryMica, Feldspar
SecondaryBeryllium, Niobium (Columbium), Tantalum
TertiaryREE, Thorium
Commodity typeB
Deposit
Deposit sizeS
Orebody formTABULAR
Materials
Ore mineralsBertrandite, Beryl, Cleavelandite, Columbite, Microcline, Microlite, Monazite, Thorite
GangueGarnet, Topaz
Geology
Host rockGneiss · Idaho Springs Formation---Interlayered Hornblende Gneiss, Calc-Silicate Gneiss, And Amphibolite
Associated rockPegmatite · Pegmatite
StructureFront Range Uplift, Denver Basin, Floyd Hill Fault Zone, Unnamed Overturned Anticline
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
First production1945
Last production1956
Identification
Deposit ID10013737
MRDS IDD010196
RegionNA
Data scoreB
Coordinates39.66666, -105.30308
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-AMEEVES, 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)