Operations began in area II (Dolores ramp) with the preparation of three of its main ramps with a section of 4.3 meters. X 4 meters In the same way, preparation and infrastructure works were carried out in areas I and III (San Nicolás and Villalpando, respectively), referring mainly to service ramps, crossings, accesses, fronts with a section of 3.0 meters. X 3.0 mts., as well as conventional 1.5 mts. X 1.5 meters. The equipment we used for these developments were: an electrohydraulic jumbo, leg machines, a 6 yd3 scoop tram, two 3 yd3 and 2 2 yd3.