Inferred Resource of 14 Million Tonnes of Copper in Peru

Rio Tinto has announced that an extensive drilling programme at La Granja, Peru spanning 18 months and some 46,000 metres has led to the estimate, in accordance with the JORC Code, of 2.8 billion tonnes of Inferred Mineral Resources grading 0.51 per cent copper and 0.1 per cent zinc representing a copper equivalent grade of 0.56 per cent at a copper equivalent cut-off of 0.3 per cent.

La Granja is in the district of Querocoto, province of Chota, Peru.

The deposit is an Andean porphyry copper deposit with associated mineralized breccias and skarns. The main intrusives are dacite porphyry, which with the breccias form irregular diatremes in the country rocks. The principal country rocks are impure limestones, siltstones and quartzites with some earlier diorite intrusions.

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