Influence of structural and lithological controls in ore-shoots formation and morphology from Julieta vein, Casposo district, Cordillera Frontal, San Juan, Argentina

JOVIC, SEBASTIÁN; PALMA DIEGO; PERMUY VIDAL, CONRADO; LOPEZ, LUCIANO; GUIDO, DIEGO; MONGAN, MARIANO; SOTARELLO, GUSTAVO

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 centre-west of the San Juan province, Argentina(Fig. 1a). It is characterized by the presence of low sulfidation epithermal veins, hosted in volcanic rocks of theChoiyoi Group (Sotarello et al. 2002). The structural trend that controls the Au-Ag mineralization has a main NW-SEdirection, with Kamila and Mercado as the main mineralized sectors (mined by open pits, and actually by undergroundmining). In Kamila sector, 3 structures with different orientations were recognized, 2 subparallel structures, Incaand B-vein with a NW-SE orientation and a SW dip, and Aztec vein with N-S orientation and W dip, between B-veinand Inca, developing a dextral jog. Julieta is one of the most important targets of Casposo district and will be inproduction at the end of 2018.