EE & COWORKER WERE REMOUNTING THE VALVE CHEST DOOR ON NO. 178 CONTINUOUS MINER. THEY HAD LEANED THE DOOR AGAINST THE SIDE OF THE MINER AND WERE GETTING READY TO LIFT THE DOOR INTO PLACE BY USI NG A CHAIN HOIST. BEFORE THEY COULD HOOK THE CHAIN OF THE CHAIN HOIST TO THE VALVE CHEST DOOR, THE DOOR FELL OVER, STRIKING EE ON THE TOP OF HIS RIGHT FOOT.