EE WAS OPERATING THE CONTINUOUS MINER LOADING A COAL HAULER WHEN A PIECE OF ROCK APPROX. 4 FOOT LONG BY 18 INCH WIDE BY 0 INCHES TO 4 INCHES THICK SLIPPED OFF THE LOADED COAL HAULER STRIKINGHI M ON THE BACK OF HIS RIGHT HAND JUST ABOVE THE THUMB RESULTING IN A LACERATION./