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Location: 74 km SE from Huaraz, Peru
Av. Circunvalación del Golf los Incas 170 Santiago de SurcoLimaPeru
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Nexa Resources S.A. owns a total of 83.48% in the Project that corresponds to the sum of Nexa’s direct interest in Nexa Perú (0.17%) and Nexa’s indirect interest in Nexa Perú (83.38%) through its controlled company Nexa Resources Cajamarquilla S.A. (99.91%).
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The mineralization at Hilarión is found in association with a Zn-Pb-Ag skarn system. Skarn mineralization is hosted by contact, metasomatic calc-silicate rocks proximal to intrusive rocks. They typically form by contact metamorphism of a carbonate rich rock. The Project is located in the Central Andes in Peru. The Central Andes developed as a typical Andean-type orogen through subduction of oceanic crust and volcanic arc activity. The Central Andes includes an ensialic crust and can be subdivided into three main sections which reveal different subduction geometry as well as different uplift mechanisms. The Northern Sector of the Central Andes, which hosts the Project, developed through extensional tectonics and subduction during early Mesozoic times. The sector was uplifted due to compression and deformation towards the foreland. In the last 5 Ma, a flat-slab subduction developed (Peruvian Flat Slab Segment). The mineralization at Hilarión–El Padrino occurs along the contacts of dikes but also as discrete tabular vertical zones. The zones are elongated parallel to the main northwestsoutheast structures, which is also the direction of most of the dikes. The Hilarión deposit consists of multiple zones that vary from 3 m to 65 m in thickness and from 100 m to 1,500 m along strike. The alteration and mineralization assemblage at Hilarión–El Padrino show overlapping phases of hydrothermal mineral formation, confirming the typical multi-pulse style of this type of mineralization (skarn). The most distal parts of the system are composed of an alteration assemblage of garnet (andradite more distal and grossularite more proximal) and pyroxene (diopside and hedenbergite). Closer to the heat source, this assemblage is overprinted by the minerals of economic interest: sphalerite-marmatite, galena, argentiferous galena and argentite, associated with pyrite and pyrrhotite. This ore has semi-massive to massive texture. Pyrrhotite is more abundant in the zones adjacent to the intrusive bodies, and at depth it can be found where chalcopyrite occurs.The mineralization in the Project area consists of sulphides containing potentially economic concentrations of Zn-Ag-Pb-(Cu-Au) that have formed during the interaction between magmatic hydrothermal fluids and the country limestone (skarn). Lithology, structure, and proximity to the intrusive are the main controls for Hilarión–El Padrino mineralization. The host rock for the mineralization is the upper member of Pariatambo Formation, which consists of tens of centimetre-scale nodular limestone beds interlayered with bituminous black marl. This combination of rocks is an outstanding chemical trap to cause sulphide precipitation as the acid hydrothermal fluid was neutralized by limestone and reduced by contact with bitumen.
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