Mineralization at the Torkera gold deposit is located at the contact between volcanic rocks (basalt-andesite) and volcanosedimentary rocks (pyroclastite, blackshale) in the relay zone within the large West Batié Shear Zone (WBZ). Along strike, these formations are not only strongly sheared, but are also affected by intense hydrothermal fluid circulation. The deposit has not yet been characterized in terms of deformation and hydrothermal alteration. The present study aims to constrain the factors controlling the variation in gold content. Direct field measurements show that the mineralized body contained within the shear zone is affected by two phases of deformation. The first is a shear-type deformation known as D1T, marked by S1T schistosities. This first phase of deformation is taken up by a second phase of deformation called D2T. This second phase is marked by S2T fracture or crenulation schistosity. Two hydrothermal alteration phases affect these formations. The first phase of hydrothermal alteration is a carbonate-chlorite-quartz ± pyrite ± iron oxide paragenesis, while the paragenesis of the second phase of alteration is quartz-pyrite-white mica ± carbonate. Gold mineralization is associated with pyrite crystals from the second phase of hydrothermal alteration, whatever the nature of the host rock. The variation in gold content along the ore body is controlled by the intensity of fluid circulation in relation to deformation. The more space freed up by deformation, the more the hydrothermal fluid interacts with the host rock, resulting in a strong silicification and pyritization phase capable of trapping gold.