Commodities
PrimarySilver, Gold
SecondaryLead, Copper
TertiaryAntimony, Tellurium, Zinc
Commodity typeM
Deposit
Deposit typeVein
Model84: Alkaline Au-Te (Au-Ag-Te veins)
Deposit sizeS
Ore controlNorth-Trending Fissures In Precambrian Quartzite And Slate
Materials
Ore mineralsBornite, Calaverite, Chalcopyrite, Galena, Marcasite, Petzite, Sphalerite, Sylvanite, Tetrahedrite
GangueBarite, Calcite, Hematite, Limonite, Quartz
Geology
Host rockQuartzite · Uncompahgre Formation
Associated rockRhyodacite,Quartz Latite,Andesite · San Juan Formation;Early Intermediate Lavas And Breccias--Near-Source Facies
StructureSan Juan Uplift, San Juan Volcanic Field, San Juan Uplift, Unnamed Fault
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
First production1892
Last production1961
Discovery year1892
Identification
Deposit ID10087902
MRDS IDD010722
Alternate namesPatented Claim: Little Giant, Ms 9145
RegionNA
Data scoreB
Coordinates37.71557, -107.52785
References
STEVEN, T.A., AND OTHERS, 1969, MINERAL RESOURCES OF THE SAN JUAN PRIMITIVE AREA, COLORADO: USGS BULL. 1261-F, P. 67-71, 89-90.STEVEN, T.A., AND OTHERS, 1974, GEOLOGIC MAP OF THE DURANGO QUADRANGLE, SOUTHWESTERN COLORADO: USGS MAP I-764.CROSS, WHITMAN, AND OTHERS, 1905, DESCRIPTION OF THE NEEDLE MOUNTAINS QUADRANGLE, COLORADO: USGS FOLIO 131.BLM MINERAL SURVEY MS 9145COLORADO DIV. MINES INSP. REPTS., 1897, V. 3, P. 265.