ESCONDIDA SULPHIDE LEACHPROJECT
2015-7-23 · copper of proved reserve and 884 million tonnes at 0.52% copper of probable reserve. In addition to this low-grade sulphide ore, which will now be treated by the Sulphide Leach Project, Escondida Norte has an estimated probable reserve of 117 million tonnes of oxide ore at an average soluble copper grade 0.77%, above a soluble copper cut-off