The municipality, formerly known as Santa Rita, grew as a settlement in the 1940s, when mining exploitation began by the
Rosario Mining Company. Explorations between 1951 and 1955 led to the discovery and exploitation of copper ore, which ceased to be extracted in 1975 with the fall in the price of this metal. After the mine was nationalized in 1979, it was abandoned and completely dismantled in 1982. Rosita became part of the municipality of Prinzapolka in 1971, but in 1989 Rosita separated from Prinzapolka to form its own municipality. In 2005, Rosita was elevated to the status of a city. == Demography ==