EE WAS WORKING ON 8A SECTION. HAD COMPLETED MINING CYCLE AND WAS IN PROCESS OF ROCK DUSTING LAST 40 FEET OF MINING IN TURN #1 TO #2 CROSSCUT. WHILE PULING ROCK DUST HOSE BACK, A PIECE OF COAL RIB FELL AND STRUCK THE EE (ESTIMATED TO BE 1""-8"" THICK X 3' X 4'). RESULTED IN CONTUSION TO RIGHT LEG AND HIP.