RIB BOLTING IN THE #2 ENTRY OF F-10 SECTION. EE HAD JUST TRAMMED BOLTER FROM TO THE NEXT BOLTING POSITION WHEN A ROCK 18"" X 1"" X 1"" FELL FROM THE ROOF AND STRUCK HIM ON TEH RIGHT FOOT. THE INJ URY WAS A LACERATION TO THE RIGHT FOOT REQUIRED 6 STITCHES TO CLOSE.