On the origin of epithermal Sn Ag Zn mineralization at the Pirquitas mine NW Argentina : fluid inclusion and isotopic constraints The Central Andes host large reserves of base and precious metals. The region represented in 2017 an important part of the worldwide mining activity. Three principal types of deposits have been identified and studied: 1) porphyry type deposits extending from central Chile and Argentina to Bolivia and Northern Peru 2) iron oxide copper gold (IOCG) deposits extending from central Peru to central Chile and 3) epithermal tin polymetallic deposits extending from Southern Peru to Northern Argentina which compose a large part of the deposits of the Bolivian Tin Belt (BTB). Deposits in the BTB can be divided into two major types: (1) tin tungsten zinc pluton related polymetallic deposits and (2) tin silver lead zinc epithermal polymetallic vein deposits. Mina Pirquitas is a tin silver lead zinc epithermal polymetallic vein deposit located in north west Argentina that used to be one of the most important tin silver producing mine of the country. It was interpreted to be part of the BTB and it shares similar mineral associations with…