Roof Fall - 3rd West Retreat Mining Section (Entry 5 inby the Pillar Line) between XC #7 & #8. About 15' wide by 15'long and 3' high. NOT at or above the anchorage zone, fell on top of a battery scoop. One miner was entrapment in the cab of the scoop. The miner escaped with no injuries. Preliminary diagnoses; Strata failure due to weight over-ride from retreat mining in Entry 4.