The walls of shafts and underground galleries, the roofs of the latter, as well as any consolidation work carried out or support systems put in place, are examined:
1° Upon resumption of each work shift, over the entire height of the shafts and over the entire length of the galleries;
2° After each blast, over a length of at least 50 metres behind the blast face.
These examinations are carried out by a competent person chosen by the employer. The name and position of this person are recorded in the safety register.