Commodities
PrimaryMica, Feldspar
SecondaryQuartz
TertiaryREE, Beryllium
Commodity typeB
Deposit
Deposit sizeN
Orebody formTABULAR
Materials
Ore mineralsBeryl, Gadolinite, Monazite, Muscovite, Xenotime
GangueBiotite, Magnetite
Geology
Host rockGneiss · Idaho Springs Formation---Interlayered Feldspar-Rich Gneiss, Hornblende Gneiss And Amphibolite, And Biotite Gneiss
Associated rockPegmatite · Pegmatite
StructureFront Range Uplift, Denver Basin, Blackhawk Fault
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
Identification
Deposit ID10013729
MRDS IDD010186
Alternate namesRoscoe Beryl, Roscoe Prospect
RegionNA
Data scoreB
Coordinates39.73721, -105.35808
References
HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-44: USGS PROF. PAPER 227, P. 84-85.SHERIDAN, D.M., AND OTHERS, 1972, GEOLOGIC MAP OF THE EVERGREEN QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-786-A.OLSON, J.C., AND ADAMS, J.W., 1962, THORIUM AND RARE EARTHS IN THE UNITED STATES: USGS MAP MR-28.MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 28, no. 69.USGS COMMODITY FILE: GR III, REEL 31, DOC. 9937, 1945; GR III, REEL 32, DOC. 100051, 1943; GR III, REEL 40, DOC. 12737, 1943; GR II, REEL 12, DOC. 2701, 1946 (FROM ORIGINAL CRIB RECORD)