Anaconda was founded by Marcus Daly, one of the Copper Kings, who financed the construction of a smelter on nearby Warm Springs Creek to process copper ore from the Butte mines. In June 1883, Daly filed for a town plat for "Copperopolis", but that name was already used by another mining town in Meagher County. Instead, Daly accepted the name "Anaconda", suggested by the United States postmaster of the time, Clinton Moore. When Montana was admitted as a state in 1889, Daly lobbied to have the capital moved here, but it stayed in Helena, a location supported by rival William Andrews Clark.
https://en.wikipedia.org/wiki/Anaconda,_Montana