Commodities
PrimarySilver
SecondaryIron, Manganese
Commodity typeM
Deposit
Model82: Epithermal veins
Deposit sizeS
WorkingsSurface
Ore controlSpherulites To 6 Ft Diam Often Carry Ore In Cavities; Ore In Concentric Shells And Matrix
Materials
Ore mineralsCerargyrite, Ocher, Psilomelane
GangueKaolin
Geology
Host rockClay, Mud,Volcanic Rock (Aphanitic),Rhyolite
Associated rockClay, Mud,Rhyolite · Silver Cliff Rhyolite Unit 2
StructureSilver Cliff Volcanic Center, Wet Mtns, Wet Mtn Valley, Large Nw-Trending Fault
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
AlterationWeak Argillization
Economic & production
Development statusPast Producer
Discovery year1895
Identification
Deposit ID10012287
MRDS IDD007838
Alternate namesBoulder Mine
RegionNA
Data scoreB
Coordinates38.14057, -105.4389
References
CROSS, WHITMAN, 1896, GEOLOGY OF SILVER CLIFF AND THE ROSITA HILLS, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 263-403.EMMONS, S.F., 1896, THE MINES OF CUSTER COUNTY, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 405-472.SHARP, W.M., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAP I-1081.