EE WAS OPERATING A FRONT-END LOADER IN THE PIT AREA, WHEN HE DROVE OVER A WIND ROW MADE BY THE DOZER, WHICH JARRED HIS BACK AND STRAINED IT. INJURY WAS NOT REPORTED TO SUPERVISOR UNTIL 10/14/ 02. EE WENT TO THE OCC. HEALTH CENTER & THEY PUT HIM ON RESTRICTED DUTY AS OF 10/14.