1938: Establishment of Cadillac as a mining village and electrification
1939: Foundation of the parish of Sainte-Brigitte and construction of the Rapide-Sept dam and power plant
1941-1951: Significant population growth linked to the O'Brien gold mine
1948: Attainment of city status and construction of sidewalks
1951: Construction of the Rapide-Deux dam and its locality
1956: Closure of the mine leading to a significant population decline
1961-1966: Opening of Cadillac Moly and Preissac Molybdenite, resulting in a new population increase
1968: Closure of the Rapide-Sept locality following the automation of the hydroelectric plant
1969: Closure of Rapide-Deux for the same reasons
1971: Closure of two mines, new population decline, and closure of CIP logging camps
1978: Opening of the Darius gold mine
1990: Operation of the Mouska mine
2002: Merger with other municipalities of the MRC