Mine detail: Keystone Mine

Previously called 'Unpatented Claims 1964: R & C Lode, C & R Nos. 3, 4, 5,Golden CycleUnpatented Claims 1946: Venus, Virginia of the Maxine Elliot Group,Annabel Lode, Fraction Claim'

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Location

Lat / long:

38.1639, -105.44751

Resource(M)

Primary:	Silver
Secondary:	Copper, Lead, Zinc, Gold
Tertiary:	Iron
Ore:	Chalcopyrite, Galena, Gold, Magnetite, Pyrite, Sphalerite
Gangue:	Barite, Fluorite, Quartz
Discovery year:	1895

Production

Operation type:	Underground
Deposit type:	Vein
Production size:	Small
Development status:	Past Producer
First production started:	1880
Last production ended:	1964

Geology

Host rock:	Undivided Gneiss
Host type:	Gneiss
Associated rock:	Undivided Silver Cliff Rhyolite
Associated type:	Rhyolite
Structure:	Silver Cliff Volcanic Center, Wet Mtns, Wet Mtn Valley, On Outermost West-Trending Ring Fault With Almost Vertical Dip
Tectonic:	Central Cordillera (Southern Rocky Mtns)
Alteration processes:	Ferruginous Zone; Oxidation

References

MRDS	D007850
DEP	10012297
Reference	{Deposit:: CROSS, WHITMAN, 1896, GEOLOGY OF SILVER CLIFF AND THE ROSITA HILLS, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 263-403.}{Deposit:: EMMONS, S.F., 1896, THE MINES OF CUSTER COUNTY, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 405-472.}{Deposit:: SHARP, W.M., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAP I-1081.}{Deposit:: COLORADO DIVISION OF MINES INSPECTION RECORDS}
Reporter	Collins, Donna B.