The Don Javier deposit is a large-size porphyry Cu-Mo deposit newly discovered in southern Peru. It is lo- cated in the Palaeogene copper and molybdenum metallogenic belt of Peru. The main outcrop in the mining area is the granodiorite of Yarabamba, and the NW-striking ore body is hosted in the dacite porphyry and its country rock. The principal ore minerals mainly include chalcopyrite, molybdenite and chacocite; from the inner part outwards the mineral alterations are potassic alteration, quartz-sericitization, argillization and propylitization, with typical porphyry copper alteration zonation; the ore body presents cylindrical form and is mainly distributed in the quartz-sericitization zone; the dacite porphyry in the mining area consists of 4 phases of dacite porphyries, among which the former 2 phases are associated with mineralization, whereas the latter 2 phases belong to post mineralization emplacement. The Don Javier deposit is similar to the nearby Cerro Verde deposit, a superlarge copper porphyry deposit in the same metallogenic belt, in metallogenic characteristics. The NW-striking fracture is the main ore-controlling structure, which controlled the rock-forming and ore-forming process. Prospecting practice verifies that intense alteration belts and low resistivity and high IP anomalies are effective indicators in the prospecting activity.