Mine detail: Little May Mine

Previously called ''

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Location

Lat / long:

37.71612, -107.5348

Resource(M)

Primary:	Gold, Silver
Secondary:	Copper, Lead
Tertiary:	Zinc, Antimony, Tellurium
Ore:	Bornite, Calaverite, Chalcocite, Chalcopyrite, Galena, Marcasite, Petzite, Sphalerite, Sylvanite, Tetrahedrite
Gangue:	Barite, Calcite, Hematite, Limonite, Quartz
Discovery year:	1892

Production

Operation type:	Unknown
Deposit type:	Vein
Production size:	Small
Development status:	Past Producer
First production started:	1893

Geology

Host rock:	Uncompahgre Formation
Host type:	Slate,Quartzite,Argillite
Associated rock:	San Juan Formation;Early Intermediate Lavas And Breccias--Near-Source Facies
Associated type:	Rhyodacite,Quartz Latite,Andesite
Structure:	San Juan Uplift, San Juan Volcanic Field, San Juan Uplift, Unnamed Fault
Tectonic:	Central Cordillera (Southern Rocky Mtns)

References

MRDS	D010723
DEP	10101864
Reference	{Deposit:: STEVEN, T.A., AND OTHERS, 1969, MINERAL RESOURCES OF THE SAN JUAN PRIMITIVE AREA, COLORADO: USGS BULL. 1261-F, P. 67-71, 89-90, 168-171.}{Deposit:: STEVEN, T.A., AND OTHERS, 1974, GEOLOGIC MAP OF THE DURANGO QUADRANGLE, SOUTHWESTERN COLORADO: USGS MAP I-764.}{Deposit:: CROSS, WHITMAN, AND OTHERS, 1905, DESCRIPTION OF THE NEEDLE MOUNTAINS QUADRANGLE, COLORADO: USGS FOLIO 131.}{Deposit:: PROSSER, W.C., 1911, THE BEAR CREEK SYLVANITE CAMP, COLORADO: ENG. MINING JOUR., V. 91, P. 712.}
Reporter	Schwochow, Stephen D.