In the geophysics world, the Ground Penetrating Radar is an instrument every day more known and used, due to its easy implementation and methodology, short acquisition times and good results; the main application fields are archeology, the construction industry, geology, mining, among others. The present thesis work mainly consisted in the acquisition, processing and interpretation of GPR data in the Pink Marble Quarry of Candoglia, which is the main source of marble for the reconstruction of the Cathedral of Milan, the main historic structure of the mentioned city. The data acquisition process consisted in 7 different surveys in 5 areas, both on the floor and on the walls of the quarry, with antennas of 200MHz and 900MHz, with the aim of finding contacts between the marble and the adjacent rock or fractures that could compromise the excavation that will be carried out in the future.