 During the 1950s, this was the largest copper producing area in the world, and included the Roan Antelope Mine, Nkana Mine, the Nchanga Mines, the Mufulira Mine, and the Rokana Mine.Chalcopyrite, bornite, and chalcocite are found in the metamorphosed calcareous shales and arkoses of the Lower Roan Formation in the Katanga System.From Doris Lessing's The Grass is Singing, "He met a man from Northern Rhodesia, who told him about the copper mines and the wonderfully high salaries.