Mine detail: Roscoe Beryl Prospect

Previously called 'Roscoe BerylRoscoe Prospect'

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Location

Lat / long:

39.73721, -105.35808

Resource(B)

Primary:	Feldspar, Mica
Secondary:	Quartz
Tertiary:	Beryllium, REE
Ore:	Beryl, Gadolinite, Monazite, Muscovite, Xenotime
Gangue:	Biotite, Magnetite
Orebody form:	TABULAR

Production

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

Geology

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

References

MRDS	D010186
MAS	80590212
DEP	10013729
Reference	{Deposit:: HANLEY, J.B., AND OTHERS, 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-44: USGS PROF. PAPER 227, P. 84-85.}{Deposit:: SHERIDAN, D.M., AND OTHERS, 1972, GEOLOGIC MAP OF THE EVERGREEN QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-786-A.}{Deposit:: OLSON, J.C., AND ADAMS, J.W., 1962, THORIUM AND RARE EARTHS IN THE UNITED STATES: USGS MAP MR-28.}{Deposit:: MEEVES, H.C., AND OTHERS, 1966, RECONNAISSANCE OF BERYLLIUM-BEARING PEGMATITE DEPOSITS IN SIX WESTERN STATES: USBM IC-8298, P. 28, no. 69.}{Deposit:: 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)}
Reporter	Schwochow, Stephen D., Intermountain Field Operations Center (IFOC), Martin, Wilson, Anna B.