The Panasqueira deposit consists in a sequence of quartz veins, notable for its size and the abundance of mineral paragenesis. In this way, the mineralized zone of W-Sn-(Cu) consists of sub-horizontal quartz veins (usually with an inclination of less than 25º, however they can present values of 30 to 40º, near the greisenized cupola) that it overlaps and fills fractures mainly developed in schist rocks, with an average of 25 cm thick (ranging from 1 to 150 cm) and a horizontal extension that can reach 200m, being on average 48m. The most important mineral in economical terms, object of exploration is tungsten (volframite); tin (cassiterite) and copper (chalcopyrite) are by-products of the exploration.