EE WAS ROOF BOLTING ON THE SECTION. HE WAS WITHDRAWING THE 2 PIECE STEEL FROM A DRILL HOLE. THE TOP SECTION OF STEEL FELL & STRUCK EE ON THE RT.LEG BELOW THE KNEE. NOTE: EE WORKED UNTIL 3/12/0 3, WHEN HE FIRST SOUGHT MEDICAL ATTN. 3/12/03 WAS FIRST DAY OFF WORK DUE TO INJURY.