Mine detail: Geyser Mine

Previously called 'Fleetwood TunnelSecurity-Geyser'

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Location

Lat / long:

38.1389, -105.4414

Resource(M)

Primary:	Silver, Lead
Secondary:	Zinc, Copper, Gold
Ore:	Argentite, Chalcopyrite, Galena, Gold, Hessite, Polybasite, Pyrargyrite, Sphalerite, Tetrahedrite
Gangue:	Barite, Calcite, Chalcedony, Garnet, Quartz, Topaz
Orebody form:	VEINS
Discovery year:	1878

Production

Operation type:	Underground
Production size:	Medium
Development status:	Past Producer
First production started:	1880
Last production ended:	1911

Geology

Host rock:	Undivided Gneiss, San Isabel Granite Of Boyer Reached At 1850 Ft, Still Mineralized
Host type:	Gneiss,Obsidian,Tuff,Volcanic Breccia (Agglomerate),Rhyolite
Associated rock:	Silver Cliff Rhyolite Unit 2
Associated type:	Gneiss,Obsidian,Tuff,Volcanic Breccia (Agglomerate),Rhyolite
Structure:	Silver Cliff Volcanic Center, Wet Mtns, Wet Mtn Valley, Silver Cliff Graben, Fault; Geyser Vent, Breccia Pipes
Tectonic:	Central Cordillera (Southern Rocky Mtns)
Alteration processes:	Weak Argillization

References

MRDS	D007922
DEP	10012344
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:: FIELDMAN, D.W. AND CROWLEY, F.P., 1980, SILVER DEPOSITS IN THE SOUTHERN PORTION OF THE SILVER CLIFF CALDERA, IN SILVER CLIFF VOLCANIC CENTER AND TALLAHASSEE CREEK URANIUM DEPOSITS: DENVER REGIONAL EXPLORATION GEOLOGISTS GUIDEBOOK, P. 1-14.}{Deposit:: SHARP, W.M., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAP I-1081.}{Production:: COLORADO DIVISION MINES INSPECTOR REPORTS, ANNUAL REPORTS}
Reporter	Collins, Donna B.