Dangerous incident: rib fell into a work area

Two pieces of rib fell into a work area on a continuous miner while a worker was roof bolting.
One worker was installing roof bolts on the right-hand side of the miner when a piece of rib (1 m long x 0.4 m deep x 2 m high) failed vertically, hitting the continuous miner. Five seconds later a second piece dislodged from the rib inbye, knocking the mechanical guard into the rear of the continuous miner.

Recommendations to industry: When strata conditions change or mining commences in new areas, the risk assessment and controls identified should be reviewed and the principal hazard management plan updated.