(Al Hartmann | The Salt Lake Tribune) The additional spending at the Bingham Canyon mine will allow average annual production of 180,000 metric tons of copper, 185,000 ounces of gold and 13,800 tons of molybdenum from 2019 to 2029, Rio Tinto. (Al Hartmann | The Salt Lake Tribune) The plan calls for Kennecott to “push back” the south wall of its mine by about 1,000 feet so miners can deepen the massive pit by another 300 feet and reach an additional 700 million tons of copper ore.