Mine detail: Esperanza Mine

Previously called 'EsperanzaValardenaJesus Marie'

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Location

Lat / long:

37.94584, -106.3056

Resource(M)

Primary:	Silver, Gold
Tertiary:	Lead, Manganese, Copper, Zinc
Ore:	Cerargyrite, Gold, Wad
Gangue:	Beidellite, Magnetite, Malachite, Quartz
Discovery year:	1884

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
Last production ended:	1920

Geology

Host rock:	Biedell Quartz Latite
Host type:	Quartz Latite
Associated rock:	Biedell Quartz Latite
Associated type:	Quartz Latite
Structure:	San Juan Volcanic Field, Rio Grande Rift, Biedell-Klondike Fault, Esperanza Fault Zone, Biedell Stock
Tectonic:	Central Cordillera (Southern Rocky Mtns)
Alteration processes:	Pervasive Propylitization; Locally Intense Argillization; Kaolinitization, Silicification

References

MRDS	D008932
DEP	10101769
Reference	{Deposit:: COE, H.S., 1922, ON RECONNAISSANCE EXAMINATION OF THE ESPERANZA MINE, SAGUACHE MINE, SAGUACHE COUNTY, COLORADO: COLORADO DIV. MINES UNPUB. ENG. REPT.}{Deposit:: NICKEL, G.D., 1922, DESCRIPTION OF ESPERANZA MINE: UNPUB. REPT. IN COLORADO DIV. MINES FILES}{Deposit:: LARSEN, E.S., JR., AND CROSS, WHITMAN, 1956, GEOLOGY AND PETROLOGY OF THE SAN JUAN REGION, SOUTHWESTERN COLORADO: USGS PROF. PAPER 258, P. 83-86.}{Deposit:: OSTERWALD, E.J., 1977, THE BEIDELL AND SANDERSON VOLCANIC CENTERS, SAGUACHE COUNTY, COLORADO: COLORADO STATE UNIV. M.S. THESIS, 145 P.}
Reporter	Schwochow, Stephen D.