EE HAD WENT INTO FACE OF #4 ENTRY WITH BOLTER OPERATOR & BOLTER AND WAS REMOVING REFLECTOR FROM 2ND ROW OF BOLTS, WHEN A PIECE OF DRAW ROCK FELL, STRIKING EE ON THE HEAD AND DRIVING HIM DOWN T O THE BOTTOM, BREAKING HIS LOWER LEG AND POSSIBLY HIS THIGH. (RT. LEG)