Mine detail: Columbia Group

Previously called ''

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Location

Lat / long:

38.21584, -106.11977

Resource(M)

Primary:

Gold, Silver

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer

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 Solutions Deposited Ore And Gangue And Caused Micaceous Altera Tion (Sericite And Chlorite) And Calcite, Quartz, And Pyrite.

References

MRDS	D008231
DEP	10012555
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.}{Deposit:: MARRS, R.W., 1973, APPLICATION OF REMOTE-SENSING TECHNIQUES TO THE GEOLOGY OF THE BONANZA VOLCANIC CENTER: COLORADO SCHOOL OF MINES PH.D. THESIS T-1531}
Reporter	Schwochow, Stephen D.