INJURED WAS HELPING LOOSEN A HUNG UP MINING MACHINE FROM MUD. HE WAS ATTEMPTING TO PLACE A CRIB BLOCK UNDER THE TREADS OF THE UNIT AND IT LUNGEDBEFORE HE COULD REMOVE HIS HAND. THE TRACKS CUT HIS RIGHT HAND. THE MINING UNIT ITSELF WAS NOT DAMAGED AND MUD COULD POSSIBLE BE A FACTOR. NO RULES OR SAFETY REGULATION VIOLATED BUT MORE AWARENESS FROM WORKERS COULD BE A FACTOR.