EMPLOYEE STATED HE WAS OPERATING THE NO. 178 JOY CONTINUOUS MINER IN THE BOTTOM END OF THE NO.4 PILLAR BLOCK. HE WAS POSITIONED ADJACENT TO THE END CORNER OF THE #4 PILLAR AND ABOUT 11 FEET AW AY WHEN THE RIB CORNER TOOK WEIGHT AND ROLLED OUT STRIKING HIM ON THE BACK, LEG AND ANKLE.