SHOULDER: Defect found on rib or outer diameter; a raised edge on rib face caused by grinding wheel; raised surface at either end of outer diameter raceway.

The characters, damage and cause of rib fall at blasting face were analysed, and preventive measures were put forward, which has some reference value for other similar condition mines.

Harry Whittington's wounds were serious: he was pepper-sprayed in the face, neck, chest and rib cage, and rushed to intensive care.