Mine detail: Keepsake Prospect

Previously called 'Concord Hill'

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Location

Lat / long:

38.11084, -105.3564

Resource(M)

Primary:	Silver
Discovery year:	1882

Production

Operation type:	Surface
Deposit type:	Vein
Production size:	None
Development status:	Prospect

Geology

Host type:	Andesite
Associated rock:	Rosita Andesite;Game Ridge Trachyte
Associated type:	Andesite
Structure:	Rosita Volcanic Center, Wet Mtns, Small Faults, Trachyte Dikes
Tectonic:	Central Cordillera (Southern Rocky Mtns)
Alteration processes:	Strong Argillization

References

MRDS	D007666
DEP	10012194
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 MAPS I-1081.}{Deposit:: SIEMS, P.L., 1968, VOLCANIC GEOLOGY OF THE ROSITA HILLS AND SILVER CLIFF DISTRICT, CUSTER COUNTY, COLORADO: COLORADO SCHOOL MINES, D. SC. THESIS, T1042, 222 P.}{Reserve-Resource:: Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.}
Reporter	Collins, Donna B., Beach, Richard A.