Mine detail: Little Jenny Mine

Previously called 'Jenny MineJennie Mine'

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Location

Lat / long:

38.32945, -106.13032

Resource(M)

Primary:	Copper, Silver, Zinc, Lead
Secondary:	Gold
Ore:	Chalcopyrite, Galena, Pyrite, Stromeyerite, Tennantite
Gangue:	Apatite, Quartz, Rhodochrosite, Rhodonite

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1883
Last production ended:	1958

Geology

Host rock:	Rawley Andesite
Host type:	Andesite
Associated rock:	Rawley Andesite
Associated type:	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 Solution Deposit Ore And Gangue And Caused Micaceous Alteration(Sericite And Chlorite) And Calcite, Quartz, And Pyrite.

References

MRDS	D008234
DEP	10012556
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.