1st. Stage – Repair of a 200 m section of the main ramp, mainly rockbolting and shotcrete . 2nd. Stage – Construction of the 900 m long and 16 m2 cross-section geotechnical gallery. 3rd. Stage – Repair of the ruin/fault in the ramp and construction of 600 m long and 30 m2 cross-section development galleries. 4th. Stage – Construction of a 5900 m long and 30 m2 cross-section gallery.