ANACONDA, a city of Montana, U.S.A., 26 m. N.W. of Butte, at an elevation of 5,30o ft.; the county seat of Deer Lodge county. The population in 193o was The Butte, Anaconda and Pacific (electric) railway connects the city with Butte and with the Northern Pacific, the Great Northern, the Oregon Short Line and the Chicago, Milwaukee, St. Paul and Pacific railways. Anaconda is a product of the Anaconda Mining Company, which in 1884 erected a plant on the north side of Warm Springs valley in order to treat locally the ore from its copper mines at Butte. This site was selected because there was no adequate water supply nearer. The first plant merely smelted the ore into matte which was sent to Swansea or to Baltimore for further re duction. In 1892 a full installation of converters was provided, and since then only metallic copper has been shipped from the district. In 1902 a new plant was erected one mile east of the city, increasing the capacity of the works to 17,00o tons of ore daily. The normal output of copper is 16% of the total produced in the United States, 9% of the world's production. Production of zinc and of manganese has been increasingly important since 1910 and 1918 respectively. The works employ 2,70o men, and use 20,000 electric horse-power from the water-power plants of the Montana Power Company, and io,000 more that is developed in steam engines on the spot. It is the largest non-ferrous reduc tion plant in the world.