THE INJURED EE HAD GONE TO #4 ENTRY TO OBSERVE THE CONTINUOUS MINER OPERATOR TAKE THE FIRST CUTOUT OF THE PILLAR BLOCK ON THE LT. SIDE OF THE ENTRY. AFTER ARRIVING AT THE MINER, A PIECE OF ROCK 8 1/2'LONG X 27""WIDE X 10""THICK ROLLED OUT OF THE RIB CATCHING THE EE ON THE RT. CALF CAUSING A FRACTURE OF HIS RT. ANKLE.