EE WAS OPERATING THE #37 MANTRIP TAKING THE 2 RIGHT COAL CREW TO THE FACE AREA WHEN A PIECE OF DRAW SLATE APPROX. 38 INCH WIDE BY 53 INCHES LONG BY 1 INCH THICK FELT FORM BETWEEN THE ROOF BOLT S AND STRUCK THE TOP OF HIS HEAD. THE ROCK THEN TURNED EDGE FIRST AND CONTINUED ON DOWN TO HIS LEGS. THE LEFT THIGHT RECEIVED THE MOST FORCE OF THE FALLING ROCK. THE HEIGHT TO THE SETTING POS