The mine property covers approximately 60,000 acres and has five pits, three of them currently in operation. Morenci is the largest copper mine in North America and one of the largest open pit mines in the world. It is the world's largest producer of copper cathode from SX/EW. (Copied from Morenci.infomine.com) On Hwy 191 (the Old Coronado Trail) Arizona. 07-08