Commodities
PrimarySilver, Gold
SecondaryLead, Copper
TertiaryZinc
Commodity typeM
Deposit
Deposit typeVein
Model85: Polymetallic veins
Deposit sizeS
Ore controlProbable Fault Subparallel To But Outside Graben
Materials
Ore mineralsArgentite, Chalcopyrite, Galena, Polybasite, Pyrargyrite, Sphalerite
GangueQuartz
Geology
Host rockShale,Siltstone,Sandstone · Cutler Formation;Dolores Formation
Associated rockGabbro · Microgabbro
StructureSan Juan Uplift, Paradox Basin, Rico Dome, Dunton Syncline, Unnamed Fault, Emma Fault
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
Last production1910
Identification
Deposit ID10014228
MRDS IDD010904
Alternate namesNil Desperandum, MS 18486a, Patented Claims: America, MS 18486a, Columbia, MS 18486a
RegionNA
Data scoreB
Coordinates37.76084, -108.10676
References
BUSH, A.L., AND BROMFIELD, C.S., 1966, GEOLOGIC MAP OF THE DOLORES PEAK QUADRANGLE, DOLORES AND SAN MIGUEL COUNTIES, COLORADO: USGS MAP GQ-536.BASTIN, E.S., 1922, SILVER ENRICHMENT IN THE SAN JUAN MOUNTAINS, COLORADO: USGS BULL. 735-D, P. 116-129.COLORADO DIV. MINES INF. REPTS.BLM MINERAL SURVEY MS 18486A