Evolution of the mineralizing events in the Inca vein, Casposo district, Cordillera Frontal, San Juan, Argentina

PALMA DIEGO; JOVIC, SEBASTIÁN; GUIDO, DIEGO; PERMUY VIDAL, CONRADO; RUIZ, REMIGIO; DE MARTINO, FACUNDO

Salta

Simposio; 15th Quadrennial Symposium of the International Association on the Genesis of Ore Deposits; 2018

The Casposo district is located in the Cordillera Frontal, in the center-west of the San Juan province, Argentina.It is characterized by the presence of low sulfidation epithermal veins, hosted in volcanic rocks of the ChoiyoiGroup. The structural trend that controls the Au-Ag mineralization has a main NW-SE direction, and Kamila andMercado are the main mineralized sectors (mined in the past with open pits, and actually underground at Kamila).In Kamila sector, 3 structures with different orientations predominate (Inca, Aztec, and B Vein). Kamila and Mercadoareas form an epithermal Au and Ag-bearing quartz vein system, mainly represented by colloform banded andbrecciated textures, and minor lattice bladed replacements. The ore includes native Au and Ag, electrum, acanthite,tetrahedrite and silver sulfosalts, which are associated with pyrite, chalcopyrite, sphalerite, galena and digenite