Mine detail: Pershing Mine

Previously called 'Pershing Manganese Mine'

<< Back to the map

Location

Lat / long:

38.24862, -106.10253

Resource(M)

Primary:	Manganese, Silver, Gold
Tertiary:	Copper, Zinc
Ore:	Chalcopyrite, Hausmannite, Manganite, Psilomelane, Pyrite, Pyrolusite, Sphalerite, Wad
Gangue:	Limonite, Quartz
Orebody form:	TABULAR TO LENTICULAR

Production

Operation type:	Unknown
Production size:	Yes
Development status:	Past Producer
Last production ended:	1959

Geology

Host rock:	Rawley Andesite;Intrusive Rhyolite
Host type:	Andesite
Associated rock:	Rawley Andesite;Intrusive Rhyolite
Associated type:	Rhyolite,Andesite
Structure:	Sawatch Range, San Juan Volcanic Field, Rio Grande Rift, Bonanza Caldera, Bonanza Manganese Belt
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	D008049
DEP	10012428
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:: 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. 6-9}{Production:: COLO. DIV. MINES ANN. OPERATOR REPTS.}
Reporter	Schwochow, Stephen D.