Tonopah No.1 dredge operating on the Blue River near Breckenridge, Colorado, in 1917. It was built in 1907-1908 on the lower Swan River by the Colorado Dredging Company and first called the Colorado I. The dredge worked downstream, but ceased operations in 1910 when it arrived at the Swan River's confluence with the Blue River and broke down. It sat idle until The Tonopah Placers Company purchased it in 1914.