THE EE WAS ASSISTING THE BOLTERS COMPLETE A CROSS CUT THERE WAS SLICK AND SLIDE ROCK INT HIS TOP AREA. THE TOP WAS PRIED AND EXAMINED. A SHARP SLICK AND SLIDE ROCK APPROX. 20 IN. LONG X 6 IN. WIDE X 4 IN. THICK FELL WITHOUT WARNING AND STRUCK THE EE S RIGHT HAND. EX RAY NEGATIVE BUT 13 STITCHES WERE NEEDED.