The Mines of Colorado

50 feet adit agent arastras Arkansas Arkansas River assays average beds Black Hawk Bobtail California California Gulch Central City claim Clear Creek County coal Colorado copper County crevice Crosby & Thompson Denver discovery dollars east eastern engine engine-house feet deep feet long fifty five Foot-hills fork four furnace Gold Mining Company Golden City gossan Gregory Gulch head hoisting hundred feet inches iron Kansas Kanyon Lake lodes machinery Middle Park miles miners mining district Moun Mount Lincoln mouth Nevada pans party Pass Pike's Peak placer mining Plains Platte pyrites Quartz Hill Range rich River rock Rocky Mountains Russell Gulch sandstone silver sluice smelting snow South Boulder South Clear Creek South Park specimens Spring stamp mill stone stream summit Summit County surface tains Territory thousand feet timber tion tons town tributaries tunnel twelve twenty Valley vein width Winter yield