Commodities
PrimaryMica, Beryllium, Feldspar
TertiaryTantalum, Niobium (Columbium)
Commodity typeB
Materials
Ore mineralsBeryl, Columbite, Muscovite, Tantalite
GangueGarnet, Tourmaline
Geology
Host rockGneiss · Idaho Springs Formation---Feldspar-Rich Gneiss;Idaho Springs Formation---Amphibolite
Associated rockPegmatite · Pegmatite
StructureFront Range Uplift, Denver Basin, Floyd Hill Fault Zone
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
Identification
Deposit ID10101837
MRDS IDD010183
Alternate namesTall Timber Nos. 1, And 3
RegionNA
Data scoreB
Coordinates39.64582, -105.27252
References
SHERIDAN, 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. 29USBM MIN. EXAM. FILE, REPTS. OF 4/6/59 AND 2/9/59 (FROM ORIGINAL CRIB RECORD)ORIGINAL CRIB RECORDS (PROBABLY USBM REFERENCE)