Mine detail: Nellie Mine

Previously called 'Sleeping Pet'

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Location

Lat / long:

38.11445, -105.32113

Resource(M)

Primary:	Silver
Secondary:	Copper, Lead, Zinc
Ore:	Galena, Sphalerite
Gangue:	Pyrite
Discovery year:	1895

Production

Operation type:	Underground
Deposit type:	Vein
Production size:	Small
Development status:	Past Producer

Geology

Host type:	Trachyte
Associated rock:	Game Ridge Trachyte
Associated type:	Trachyte
Structure:	Rosita Volcanic Center, Wet Mtns, On Nellie Fault
Tectonic:	Central Cordillera (Southern Rocky Mtns)
Alteration processes:	Weak To Moderate Argillization

References

MRDS	D007854
DEP	10012300
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: 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CENTERS, CUSTER COUNTY, COLORADO: USGS MAP I-1081.}{Reserve-Resource:: Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.}
Reporter	Collins, Donna B., Beach, Richard A.