Mine detail: Express Mine

Previously called 'Express-Headlight Mine'

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Location

Lat / long:

38.2514, -106.11032

Resource(M)

Primary:	Silver, Gold
Secondary:	Zinc, Lead, Copper
Tertiary:	Manganese
Ore:	Bornite, Chalcopyrite, Covellite, Enargite, Galena, Pyrargyrite, Pyrite, Sphalerite, Stromeyerite, Tennantite
Gangue:	Fluorite, Quartz, Rhodochrosite

Production

Operation type:	Unknown
Production size:	None
Development status:	Occurrence
Last production ended:	1928

Geology

Host rock:	Rawley Andesite;Intrusive Quartz Latite And Rhyolite
Host type:	Quartz Latite,Latite,Andesite
Associated rock:	Rawley Andesite;Intrusive Quartz Latite And Rhyolite
Associated type:	Quartz Latite,Latite,Andesite
Structure:	Bonanza Caldera, Sawatch Range, San Juan Volcanic Field, Rio Grande Rift
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	D008036
DEP	10012421
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.