THE EMPLOYEE STATED HE WAS WALKING BESIDE THE MULE TRAIN ON 4 LEFT 2 EAST SECTION WHEN HE HOOKED HIS PANTS LEG ON A PIECE OF METAL STICKING OUT OF THE HOIST CAR AND CAUSED HIM TO HIT HIS KNEE ON A PIECE OF BELT STRUCTURE. THE EMPLOYEE STARTED MISSING WORK DUE TO THIS INJURY ON 2-6-03.