Hydro-Ressources is currently doing some important underground field work to gather hydrogeological data in La Platosa mine (Mexico). A total of 12 holes have been drilled and tested on two differents areas. These tests includes Velocity Flow Profil (VFP), pump test and packer test coupled with core logging. Aproximately 10 more holes needs to be drilled. All these datas will be used to identify the water-bearing structures in order to define four new pumping wells location.