Roof fall occurred in the number 4 entry, while pillaring the left block on the 002-0 MMU. The fall was approx 22' high at its highest point & 60' long & 20' wide. Two mobile roof supports were caught in the fall area. A large slip was laying at a slight angle along the #4 entry when the continuous miner was pillaring the left block the entry begin to give indications of failure.