Commodities
PrimaryManganese, Silver, Gold
TertiaryCopper, Zinc
Commodity typeM
Deposit
Deposit sizeY
WorkingsUnderground
Orebody formTABULAR TO LENTICULAR
Ore controlSee Comments
Materials
Ore mineralsChalcopyrite, Hausmannite, Manganite, Psilomelane, Pyrite, Pyrolusite, Sphalerite, Wad
GangueLimonite, Quartz
Geology
Host rockAndesite · Rawley Andesite;Intrusive Rhyolite
Associated rockRhyolite,Andesite · Rawley Andesite;Intrusive Rhyolite
StructureSawatch Range, San Juan Volcanic Field, Rio Grande Rift, Bonanza Caldera, Bonanza Manganese Belt
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
Last production1959
Identification
Deposit ID10012428
MRDS IDD008049
Alternate namesPershing Manganese Mine
RegionNA
Data scoreB
Coordinates38.24862, -106.10253
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.WELLS, R.R., AND OTHERS, 1952, BENEFICIATION OF OXIDE MANGANESE ORES FROM ARAPAHOE, DOUGLAS, SAGUACHE, CUSTER, CHAFFEE, AND PARK COUNTIES, COLO.: USBM R1-4845, P. 6-9COLO. DIV. MINES ANN. OPERATOR REPTS.