Commodities
PrimaryFeldspar, Beryllium
SecondaryNiobium (Columbium), Tantalum
TertiaryMica
Commodity typeB
Deposit
Deposit sizeS
Orebody formTABULAR
Materials
Ore mineralsBeryl, Microcline, Muscovite
GangueAlbite, Apatite, Biotite, Manganotantalite, Quartz, Tourmaline
Geology
Host rockGneiss · Idaho Springs Formation-Hornblende Gneiss Unit
Associated rockPegmatite · Granitic Pegmatite
StructureFront Range Uplift, Denver Basin, Hurricane Hill Fault System
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
Identification
Deposit ID10013733
MRDS IDD010191
RegionNA
Data scoreB
Coordinates39.7861, -105.25614
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)HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-44: USGS PROF. PAPER 227, P. 86MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 27.USGS COMMODITY FILE, GR III, REEL 31, DOCK. 9937, 1945; GR III, REEL 32, DOCK. 10049, 1943; GR III, REEL 40, DOCK. 12742, 1944 (FROM ORIGINAL CRIB RECORD)ORIGINAL CRIB RECORD (SEE USGS REFERENCE)