EE WAS OPERATING THE C-M IN THE 33 ENTRY. HE WAS STANDING 6 OR 7 ROWS BACK FROM THE START OF THE CUT. HE HAD LOADED ABOUT 1/3 OF THE CUT. WHEN A ROCK 3"" THICK X 3 1/2'X3 1/2' AROUND FELL FR OM THE TOP BETWEEN THE RIB AND THE BOLTS ON THE RIGHT SIDE OF HT ENETRY. STRIKING HIM ON THE HEAD, NECK AND SHOULDERS. HE WAS PLACED ON A BACKBOARD AND TRANSPORTED OUTSIDE.