Mine detail: Cliff Mine

Previously called 'Cliff No. 1 Tunnel'

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Location

Lat / long:

38.30195, -106.12477

Resource(M)

Primary:	Zinc, Silver, Lead, Copper
Secondary:	Gold
Ore:	Chalcopyrite, Galena, Sphalerite
Gangue:	Jasper, Pyrite

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
Last production ended:	1957

Geology

Host rock:	Bonanza Tuff;Rawley Andesite
Host type:	Latite
Associated rock:	Bonanza Tuff;Rawley Andesite
Associated type:	Latite,Andesite
Structure:	Sawatch Range, San Juan Volcanic Field, Rio Grande Rift, Bonanza Caldera
Tectonic:	Central Cordillera (Southern Rocky Mtns.)
Alteration processes:	Early Barren Stage Of Alteration By Fumarolic Or Acid-Hot Spring Activity Resulted In Intense Silicification, Wallrock Replacement By Jasper And Alteration Products Hematite, Diaspore, Alunite, Barite, Zunyite, Rutile, And Kaolin Minerals. Later Mineralizing Stage By Alkaline Or Neutral Solutions Deposited Ore And Gangue And Caused Micaceous Alteration (Sericite And Chlorite) And Calcite, Quartz, And Pyrite.

References

MRDS	D008211
DEP	10012542
Reference	{Deposit:: PATTON, H.B., 1916, GEOLOGY AND ORE DEPOSITS OF THE BONANZA DISTRICT, SAGUACHE COUNTY, COLORADO: COLORADO GEOLOGICAL SURVEY BULL. 9, 136 P.}{Deposit:: BURBANK, W.S., 1932, GEOLOGY AND ORE DEPOSITS OF THE BONANZA MINING DISTRICT, COLORADO: USGS PROF. PAPER 169, 166 P.}
Reporter	Schwochow, Stephen D.