Commodities
PrimarySilver, Gold
SecondaryZinc, Lead, Copper
TertiaryManganese
Commodity typeM
Deposit
Deposit sizeN
WorkingsUnderground
Ore controlSee Comments
Materials
Ore mineralsBornite, Chalcopyrite, Covellite, Enargite, Galena, Pyrargyrite, Pyrite, Sphalerite, Stromeyerite, Tennantite
GangueFluorite, Quartz, Rhodochrosite
Geology
Host rockQuartz Latite,Latite,Andesite · Rawley Andesite;Intrusive Quartz Latite And Rhyolite
Associated rockQuartz Latite,Latite,Andesite · Rawley Andesite;Intrusive Quartz Latite And Rhyolite
StructureBonanza Caldera, Sawatch Range, San Juan Volcanic Field, Rio Grande Rift
Tectonic settingCentral Cordillera (Southern Rocky Mtns.)
AlterationEarly 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.
Economic & production
Development statusOccurrence
Last production1928
Identification
Deposit ID10012421
MRDS IDD008036
Alternate namesExpress-Headlight Mine
RegionNA
Data scoreB
Coordinates38.2514, -106.11032
References
PATTON, H.B., 1916, GEOLOGY AND ORE DEPOSITS OF THE BONANZA DISTRICT, SAGUACHE COUNTY, COLORADO: COLORADO GEOLOGICAL SURVEY BULL. 9, 136 P.BURBANK, W.S., 1932, GEOLOGY AND ORE DEPOSITS OF THE BONANZA MINING DISTRICT, COLORADO: USGS PROF. PAPER 169, 166 P.