Cf SEDAR From April 11 to April 15, production was stopped following an
incident caused by a presumed detonation and from April 25
to May 23, it was interrupted again when CSST inspectors
raised a doubt concerning the quality of pillars in stopes. We
asked a group of experts in rock mechanics to evaluate the
situation. They concluded that the pillars in most of the rooms
appear to be working well but in many cases, there is a
significant amount of material scaled from the sidewalls. To
maintain the stability of the pillars, they recommended to add
mesh straps and rock bolts to protect the wall of the pillars.