Rio OT Mongolia Oyu Tolgoi
At peak production, OT is expected to operate in the first quartile of the copper cash cost curve (3). OT is expected to produce around 500,000 tonnes of copper per year on average from 2028 to 2036 from the open pit and underground, and an average of around 350,000 tonnes for a further five years (4), compared with 163,000 tonnes in 2021 (5). The underground ore reserve has an average copper grade of 1.52 per cent, which is more than three times higher than the open-pit ore reserve, and contains 0.31 gram per tonne gold