Big Muskie
Big Muskie was a coal mining Bucyrus-Erie dragline owned by the Central Ohio Coal Company (a division of American Electric Power), and was the world's largest mobile earth-moving machine, weighing nearly 13,000 metric tons and standing nearly 22 stories tall. It operated in the U.S. state of Ohio from 1969 to 1991, and was powered by 13,800 volts of electricity.
Built at a cost of $25,000,000 (1969), Big Muskie removed over 608,000,000 cubic yards of overburden (twice the earth moved during the construction of the Panama Canal), uncovering over 20,000,000 tons of clean coal. It was 151.5 feet wide, 222.5 feet in height, and 487.5 feet in length with the boom down. It took over 200,000 man hours to contruct over a period of about two years.