Abstract: After a period of operation, the underground crushing system in Caolou Iron Mine was found to have a cavity in its upper bin. The causes for the cavity in the bin wall were analyzed, a rational reinforcement plan was designed and issues needing attention in ore bin design, management and construction were proposed. The inspection made after a period of operation of the reinforced bin indicates that the reinforcement measures are effective and safe and the reinforced bin wall is in good condition, satisfying the requirement and achieving the reinforcement purpose.

Key words: Crushing system, Upper bin, Failure analysis, Reinforcement plan