Commodities
PrimarySilver, Copper
Commodity typeM
Deposit
Model85: Polymetallic veins
Deposit sizeN
WorkingsUnderground
Orebody formLENSES, SEAMS, PEBBLE-LIKE MASSES
Ore controlFaults, Fracture Zones Paralleling Monzonite Dikes; Coaly Material
Materials
Ore mineralsChalcocite, Malachite, Silver
GangueCalcite, Limonite, Pyrite
Geology
Host rockShale,Sandstone,Limestone · Dolores Formation
Associated rockMonzonite,Felsic Volcanic Rock · Monzonite Porphyry
StructureSan Juan Uplift (San Juan Mountains), La Plata Mountains Dome, Faults, Fractures Parallel To Dike For 10 To 20 Ft
Tectonic settingCentral Cordillera (Southern Rocky Mountains), Colorado Plateau
AlterationHydrothermal Alteration, Bleaching
Economic & production
Development statusProspect
First production1882
Last production1932
Discovery year1882
Identification
Deposit ID10094556
MRDS IDD009282
RegionNA
Data scoreB
Coordinates37.49084, -108.05926
References
GODDARD, E.N., 1949, COPPER DEPOSITS OF THE BEAR CREEK DISTRICT, IN ECKEL, E.B., 1949, GEOLOGY AND ORE DEPOSITS OF THE LA PLATA DISTRICT, COLORADO: USGS PROF. PAPER 219, P. 70-72, 90-91, pl. 13, #4.BURCHARD, H.C., 1883, REPORT OF THE DIRECTOR OF THE MINT FOR 1882, P. 508.