Mine detail: Mill Gulch Mine

Previously called ''

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Location

Lat / long:

38.70722, -105.56308

Resource(M)

Primary:	Copper
Secondary:	Silver
Ore:	Chalcopyrite, Silver
Gangue:	Actinolite, Anthophyllite, Chlorite, Clinozoisite, Epidote, Garnet, Magnetite, Quartz, Sphene
Orebody form:	LENSOID, TABULAR, POD-LIKE

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer

Geology

Host rock:	Biotite Gneiss, Migmatitic Gneiss
Host type:	Gneiss
Associated rock:	Boulder Creek Granite, Quartz Monzonite;Rhyolitic And Andesitic Tuff And Tuff Breccia
Associated type:	Quartz Monzonite,Volcanic Breccia (Agglomerate),Rhyolite,Granite
Structure:	Thirtyone Mile Mountain Volcanic Center, Thirtynine Mile Volcanic Field, Front Range, Currant Creek Fault And Related Nw-Trending Faults
Tectonic:	Central Cordillera (Southern Rocky Mountains)

References

MRDS	D010342
DEP	10087862
Reference	{Deposit:: HEINRICH, E.W., 1981, PRECAMBRIAN TUNGSTEN AND COPPER-ZINC SKARN DEPOSITS OF SOUTH-CENTRAL COLORADO: CGS RESOURCE SERIES 21, 115 P.}{Deposit:: BELSER, CARL, 1956, TUNGSTEN POTENTIAL IN CHAFFEE, FREMONT, GUNNISON, LAKE, LARIMER, PARK, AND SUMMIT COUNTIES, COLORADO: USBM INFORMATION CIRCULAR 7748, P. 19-26}{Deposit:: EPIS, R.C., WOBUS, R.A. AND SCOTT, G.R., 1979, GEOLOGIC MAP OF THE BLACK MOUNTAIN QUADRANGLE, FREMONT AND PARK COUNTIES, COLORADO: USGS MAP I-1195, 1:62,500.}
Reporter	Collins, Donna B.