EE WAS OPERATING FRONT END LOADER SCREENING COALAND CLEANING CLOGGED HOPPERS ON 12-6-02. IMMEDIATE SUPERVISOR WAS NOTIFIED ON 12-11-02 THAT EE HURT HIS BACK ON 12-6-02 AND WAS HAVING CHIROPRA CTIC TREATMENTS AND NEEDED TO FILE AN ACCIDENT REPORT. EE COULD NOT PINPOINT TIME OF ACCIDENT.