Sistema epitermal de baja sulfuración en el área Casposo-Villa Corral, Calingasta, San Juan, Argentina

SOTARELLO, GUSTAVO; BELVIDERI, IRMA; MACHUCA, EDUARDO; CASTRO DE MACHUCA, BRÍGIDA

Mendoza

Conferencia; Argentina Mining 2002; 2002

Argentina Mining Committee (N. Rojas y Asociados)

The gold-silver mineralization at Cerro Casposo, is hosted within numerous multiphase epithermal quartz-adularia-calcite-illite-sericite-sulphide veins, breccias and stockworks associated with tensional faulting and hydrothermal brecciation in a porphyroclastic-volcanic sequence (rhyolite to andesite) of permian-triassic age (Choiyoi Group). Mineralization occurs scattered over 20 km2 area of extensive propylitic alteration. Silicification and argillic halos up to tens of meters wide are parallel to the main veins. Mineralization occurs predominantly along subvertical to steeply south-southwesterly dipping, northwest-southeast, north-south and east-west striking structures. The ore minerals include native gold, electrum, argentite ad silver sulphosalts associated with fine-grained disseminated pyrite and minor amounts of sphalerite, chalcopyrite, tetrahedrite, luzonite, arsenopyrite, stibnite and locally cinnabar. Oxidation has reached depths of more than 100 meters within veins and fault breccias.