The Antapaccay project contains a porphyry-skarn type (copper-silver-gold) deposit located in the Eocene-Oligocene Andahuaylas-Yauri strip, 9.4 kilometres southwest in a straight line from the Tintaya mine, in the area of the old Atalaya mine. The Eocene-Oligocene Andahuaylas-Yauri strip is located 250 to 300 kilometres west of the current Peru-Chile Trench, above a thick cap of sialic crust (50 to 60 kilometres), in a transitory zone between the flat subduction slab of central Peru and the normal subduction of southern Peru and northern Chile and immediately to the southeast of the Abancay deflection. It consists geologically of a thick cretaceous sedimentary sequence folded during the Andean deformations and widely intruded by stocks, sills and dykes of Andahuaylas-Yauri batholith, covered by Cenozoic lacustrine and volcanic deposits and quaternary deposits.

The copper mineralization at Antapaccay is mainly contained in intermediate intrusive rocks with dissemination, veinlets, hydrothermal breccias which are in contact with pre-mineral rocks such as diorites and sedimentary rocks (limestones, calcareous shales, siltstones and sandstones), forming contact mineralized breccias, exoskarn and stockwork in sedimentary bodies with a clear predominance of chalcopyrite over bornite up to 350 metres; the roles reverse at a greater depth and are associated with a level of anhydrite-gypsum.

The dominant mineralization within the porphyry is chalcopyrite, followe ........

The Antapaccay mine is an open pit mine (consisting of a North pit and a South pit) with truck and shovel operations that provide a total annual material handling capacity of approximately 165 million tonnes of material. Major equipment includes a fleet of owner-operated 400 short ton class trucks, 48 cubic metre and 35 cubic metre rope shovels, dozers and loaders, as well as support equipment. Ore is mined and sent to the primary crusher located at the mine and the crushed ore is subsequently transported to the coarse ore stockpile by an overland conveyor of approximately 6.8 kilometres. The feeders at the coarse ore stockpile convey the crushed ore to the Antapaccay plant for processing. A portion of the material from the coarse ore stockpile is transported to the Tintaya plant for processing.

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