Mine detail: Mill Gulch Mine

Previously called ''

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Location

Lat / long:

38.70639, -105.56891

Resource(M)

Primary:	Copper
Secondary:	Zinc, Silver
Gangue:	Anthophyllite, Apatite, Calcite, Clinozoisite, Cordierite, Diopside, Magnetite, Quartz, Sillimanite, Sphene, Spinel, Tremolite

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1932
Last production ended:	1932

Geology

Host rock:	Migmatitic Gneiss Idaho Springs Formation
Host type:	Phyllite,Gneiss,Skarn (Tactite)
Associated rock:	Quartz Diorite Of Boulder Crek Age
Associated type:	Diorite
Structure:	Thirtynine Mile Volcanic Field, Guffey Volcanic Center, Currant Creek Fault And Related Nw-Trending Faults
Tectonic:	Central Cordillera, Southern Rocky Mountains

References

MRDS	D004913
DEP	10010873
Reference	{Deposit:: LOVERING AND GODDARD 1950 GEOLOGY AND ORE DEPOSITS OF THE FRONT RANGE, COLO. USGS PROFESSIONAL PAPER 223 P. 69.}{Deposit:: HEINRICH, E.W., 1981, PRECAMBRIAN TUNGSTEN AND COPPER-ZINC SKARN DEPOSITS OF SOUTH-CENTRAL COLORADO: CGS RESOURCE SERIES 21, 115 P.}{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., Foord, Suzann C