THE ROOF BOLTER OPERATORS COMPLETED A ROW OF ROOF BOLTS IN THE FACE; THE LEFT SIDE OPERATOR WAS STANDING AT THE ON-DECK CONTROLS. THE RIGHT SIDE OPERATOR WAS IN THE PROCESS OF KNEELING ON THE STEP SO THAT THE MACHINE COULD BE ADVANCED 5 FT. FORWARD. THE CAT TRACK RAN OVER THE VICTIM'S TOES.