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1Geologic map of the Front Range mineral belt Colorado
No 2Preliminary geological report on the west slope of
No 3Geology and ore deposits of the Magnolia mining dis
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altered altitude andesite base-metal Basin beds biotite bodies breccia breccia reefs caldera Camp Bird Canyon chalcopyrite chimney Colo Colorado contain copper crosscut Denver deposits depth dikes district drift early east Engineer Mountain fault zone feet wide ﬁg fissures ﬂow fluorspar formation formed fractures Frank Hough Front Range galena gangue gneiss Gold Hill gray hornblende igneous intrusive Leadville limestone locally lode lower miles mineral belt Mineral Point mines northeast northwest Old Lout ounces of silver Ouray outcrops output pegmatite percent places porphyry portal Poughkeepsie Gulch pre-Cambrian prospecting pyrite quartz latite quartz monzonite quartzite Red Mountain region rhyolite San Juan tuff schist shaft shale shear shoots siliciﬁed Silverton slope Sneffels solutions southwest sphalerite strike structure sulphides surface Survey Telluride Tertiary thick tion tons trend tuff tunnel U. S. Geol Uncompahgre upper vertical volcanic pipes wall width