STRUCK ON LEG BY A CHAIN HOIST. EE WAS PULLING A 5 TON COME-A-LONG FROM INSIDE OF ROCK BOX THATSETS OVER THE JAWCRUSHER. THE COME0-A-LONG WAS BEING USED TO LIFT CHECK PLATES OUT FOR EXCHANGE. WHEN LIFTING THE RACHET PART OF THE COME-A-LONG OUT & DRAGGING THE LIFT HOOK BLOCK UP WITH THE COMEALONG, CHAINS FOR REMOVAL FROM THE BOX, THE HOOK BLOCK REACHED THE TOP EDGE OF THE BOX & SWUN