EE WAS ON HIS KNEES WORKING ON A CONTINUOUS MINER, WHEN A PIECE OF ROCK FELL FROM BETWEEN ROOF BOLTS HITTING HIM ON THE BACK SIDE OF LEFT LEG, BELOW KNEE. ROCK SIZE WAS 30"" LONG 16"" WIDE 1"" TO 2"" THICK. HEIGHT WAS 7'. 1ST DAY FROM WORK WAS ON 7-30-03.