Mine detail: Colfelco No. 12 Pegmatite

Previously called ''

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Location

Lat / long:

38.45834, -105.35501

Resource(B)

Primary:	Feldspar
Secondary:	Mica, Beryllium
Ore:	Beryl, Microcline
Gangue:	Magnetite, Quartz, Tourmaline
Other material:	Muscovite
Discovery year:	1945

Production

Operation type:	Unknown
Production size:	None
Development status:	Past Producer
First production started:	1947

Geology

Host rock:	Migmatitic Gneiss
Host type:	Gneiss,Pegmatite
Associated rock:	Quartz Diorite;Granodiorite
Associated type:	Diorite
Structure:	Southern Front Range, Canon City Embayment, Eightmile Park, Ne-Trending Faults
Tectonic:	Central Cordillera (Southern Rocky Mountains)

References

MRDS	D009888
DEP	10094598
Reference	{Deposit:: HEINRICH, E. W., 1948, PEGMATITES OF EIGHT MILE PARK, FREMONT COUNTY, COLORADO: THE AMERICAN MINERALOGIST, V. 33, NOS. 7-10, P. 420-448, 550-587}{Deposit:: TAYLOR, R. B., SCOTT, G. R., WOBUS, R. A. AND EPIS, R. C., 1975, RECONNAISSANCE GEOLOGIC MAP OF THE ROYAL GORGE QUADRANGLE, FREMONT AND CUSTER COUNTIES, COLORADO: USGS MAP I-869, 1:250,000}
Reporter	Collins, Donna B.