Mine detail: Roscoe Gulch Pegmatites

Previously called 'Roscoe Gulch Pegmatite'

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Location

Lat / long:

39.74721, -105.37336

Resource(B)

Primary:	Feldspar, Mica, Beryllium
Secondary:	REE
Ore:	Allanite, Beryl, Microcline, Monazite, Muscovite
Gangue:	Garnet, Magnetite, Tourmaline

Production

Operation type:	Surface
Production size:	None
Development status:	Past Producer

Geology

Host rock:	Pegmatite;Idaho Springs Formation---Interlayered Feldspar-Rich Gneiss, Hornblende Gneiss, Amphibolite, Biotite Gneiss
Host type:	Gneiss
Associated rock:	Pegmatite
Associated type:	Pegmatite
Structure:	Front Range Uplift, Denver Basin, Blackhawk Fault, Unnamed Syncline
Tectonic:	Central Cordillera (Southern Rocky Mtns)

References

MRDS	D010185
MAS	80590163
DEP	10013728
Reference	{Deposit:: SHERIDAN, D.M., AND OTHERS, 1972, GEOLOGIC MAP OF THE EVERGREEN QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-786-A}{Deposit:: MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 28}{Deposit:: USBM MIN. EXAM. FILE, REPT. OF 6/1/59 (FROM ORIGINAL CRIB RECORD)}
Reporter	Schwochow, Stephen D., Intermountain Field Operations Center (IFOC), Wilson, Anna B.