EE WAS IN THE PROCESS OF ROOF BOLTING PROCEDURES IN THE #4 ENTRY ON COMPANY #001 SEC. HE HAD JUST FINISHED DRILLING HOLE TO INSTALL A 6' RESIN GROUTED ROD & WAS IN THE PROCESS OF REMOVING THE DRILL STEEL FROM THE HOLE WHEN A PIECE OF DRAW ROCK FELL STRIKING HIM ON THE LEFT LEG ABOVE THE ANKLE. THE ROCK MEASURED APPROX. 39""L X 24""W X 1/2"" TO 3 1/2""THICK. FRACTURED TIBIA & FIBULA.