Commodities
PrimarySilver, Lead, Zinc, Gold
SecondaryCopper
TertiaryTellurium, Manganese
Commodity typeM
Deposit
Deposit sizeS
Ore controlSee Comments
Materials
Ore mineralsAltaite, Chalcopyrite, Covellite, Galena, Hessite, Petzite, Pyrite, Rickardite, Sphalerite, Sylvanite, Tennantite
GangueBarite, Calcite, Limonite, Quartz, Rhodochrosite
Geology
Host rockAndesite · Rawley Andesite
Associated rockAndesite · Rawley Andesite
StructureSawatch Range, San Juan Volcanic Fields, Rio Grande Rift, Bonanza Caldera
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 statusPast Producer
First production1881
Last production1948
Identification
Deposit ID10012538
MRDS IDD008204
Alternate namesEmpress Josephine and Boss Mammoth Claims
RegionNA
Data scoreB
Coordinates38.29918, -106.1356
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.