EMPLOYEE WAS WORKING ON THE ROBBINS DRILL HELPING TO HANG A PIECE OF DRILL STEEL PER INTERPRETOR HE JUMPED DOWN WHILE HOLDING ON TO RAIL & HURT RT. SHOULDER. 6/18/05 WENT TO ER & WAS TOLD RT. SHOULDER WAS DISLOCATED, REPORTED TO ANOTHER FACILITY 6/19/05 DUE TO AFTER SHOWERING HIS RT. SHOULDER CAME OUT OF PLACE, SURGERY PERFORMED ON 6/20/05.