The Mines of Colorado, Volume 20

50 feet adit agent arastras Arkansas Arkansas River assays average beds Black Hawk Bobtail California 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 fork four furnace Gold Mining Company Golden City gossan Gregory Gulch head hight hoisting hundred feet inches iron Kansas Kanyon Lake lodes machinery Middle Park miles miners Missouri River 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 thick thousand feet timber tion tons town tributaries tunnel twelve twenty Valley vein width Winter yield