Commodities
PrimaryBeryllium, REE, Feldspar
Commodity typeB
Deposit
Deposit sizeS
Orebody formTABULAR
Materials
Ore mineralsBeryl, Microcline
GangueGarnet, Monazite
Geology
Host rockGneiss,Amphibolite · Idaho Springs Formation---Hornblende Gneiss Unit
Associated rockPegmatite · Granitic Pegmatite
StructureFront Range Uplift, Denver Basin, Junction Ranch Fault System, Unnamed Anticline, Unnamed Overturned Anticline
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
Identification
Deposit ID10101838
MRDS IDD010195
RegionNA
Data scoreB
Coordinates39.76582, -105.34919
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)PARKER, R.L., 1963, NIOBIUM AND TANTALUM IN THE UNITED STATES: USGS MAP MR-36MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 28.USBM MIN. EXAM. FILE, REPT. 6/1/59 (FROM ORIGINAL CRIB RECORD)ORIGINAL CRIB RECORD (SEE USBM REFERENCE)