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Location: 183 km NE from Valparaiso, Chile
Avenida Apoquindo 4001 Piso 18 Las CondesSantiagoChile7550162
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– 60% Antofagasta plc
– 9.21% Marubeni Corp.
– 15.79% JX Metals Corp. (formerly JX Nippon Mining & Metals Corp.)
- 10% Mitsubishi Materials Corp.
- 5% Mitsubishi Corp.
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The porphyry copper mineralization at Los Pelambres is contained in two contiguous deposits, Los Pelambres (Cu-Mo) and Frontera (Cu-Au), which together constitute the third largest copper concentration (~36 million metric tons (Mt) Cu) in the Miocene to early Pliocene belt of central Chile. Los Pelambres is centered on a composite, N-oriented, ~4.5- × 2.5-km precursor quartz diorite stock emplaced within the regional, NNW-striking, E-vergent Los Pelambres reverse fault. The fault places intensely deformed Late Cretaceous volcanic and late Oligocene to early Miocene volcanic and volcanosedimentary rocks of the Los Pelambres Formation over gently folded early Miocene volcanic rocks of the Pachón Formation. Copper-gold mineralization at Frontera is hosted mainly by andesite of the Pachón Formation.Los Pelambres and Frontera are spatially and genetically related to multiphase porphyry bodies that are located within and immediately southeast of the Los Pelambres stock. The stock is emplaced into the Late Cretaceous rhyolitic tuff and late Oligocene to early Miocene Los Pelambres and Pachón Formations.East of the fault, the Pachón Formation is composed of gently to steeply dipping (20°-70°W), massive andesitic flows and flow breccias, whereas moderately to steeply dipping (50°-80°W) epiclastic rocks and andesite flows constitute the Los Pelambres Formation to the west. Several roof pendants and large blocks of massive andesite, some up to 500 m in vertical extent, are present in the Los Pelambres stock, defining a NW-trending corridor through the north-central parts of the open pit. Within the pit and its immediate environs, both formations are also intruded by numerous, coarse-grained, porphyritic andesite dikes and sills of premineral age and, more locally, as in the northern high wall of the pit, by quartz-eye-bearing sills of dacitic composition (cf. quartz-feldspar porphyry of Atkinson et al., 1996). West of the Los Pelambres fault, the brownishcolored epiclastic sandstone and shale of the Los Pelambres Formation unconformably overlie the Late Cretaceous rhyolitic tuff.
