With a design ore production capacity of 12.5 million tonnes per...

With a design ore production capacity of 12.5 million tonnes per year, the Pulang copper mine is China's second largest block caving mine

Some porphyry Cu-Au deposits with relatively reduced ore assemblages, characterized by high hydrothermal pyrrhotite contents and a lack of primary hematite and magnetite, are generally considered to be associated with reduced I-type granitoids. However, the role of magmatic oxygen fugacity (fO.sub.2) in controlling Cu-Au mineralization in such reduced porphyry deposits is poorly understood. The giant Late Triassic (ca 216 Ma) Pulang porphyry Cu-Au deposit of southwest China shows typical reduced ore assemblages