Mine detail: Upper South Mine

Previously called 'Colorado Feldspar Company Mine'

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Location

Lat / long:

38.68722, -105.48336

Resource(B)

Primary:	Mica
Tertiary:	Feldspar, Beryllium
Ore:	Microcline, Muscovite
Gangue:	Biotite
Orebody form:	LENS SHAPED
Discovery year:	1950

Production

Operation type:	Surface-Underground
Production size:	Small
Development status:	Past Producer
First production started:	1950

Geology

Host type:	Gneiss
Associated rock:	Quartz Diorite Of Boulder Creek Age
Associated type:	Diorite
Structure:	Southern Front Range, Thirtynine Mile Volcanic Field, Currant Creek Fault Zone
Tectonic:	Central Cordillera (Southern Rocky Mountains)

References

MRDS	D009872
DEP	10101827
Reference	{Deposit:: HANLEY, J. B., HEINRICH, E. W., PAGE, L. R., 1950, PEGMATITE INVESTIGATIONS IN COLORADO, WYOMING, AND UTAH, 1942-1944: USGS PROFESSIONAL PAPER 227, P. 42-55}{Deposit:: WOBUS, R. A., EPIS, R. C. AND SCOTT, G. R., 1979, GEOLOGIC MAP OF THE COVER MOUNTAIN QUADRANGLE, FREMONT, PARK, AND TELLER COUNTIES, COLORADO: USGS MAP I-1179, 1:62,500.}{Deposit:: STERRETT, D. B., 1923, MICA DEPOSITS OF THE UNITED STATES: USGS BULLETIN 740, P. 51-55.}
Reporter	Collins, Donna B.