EMPLOYEE SPENT 6 HRS. SHOVELING THE 2 BELT IN THE MILL, THEN ANOTHER 6.5 HRS. OPERATING FRONT-END LOADER. WHILE OPERATING LOADER, HE STARTED TO FEEL STIFFNESS & PAIN IN HIS BACK, WHICH BECAME INCREASINGLY WORSE AS THE SHIFT WENT ON. 6/1/00, HE COMPLAINED OF EXTREME SORENESS & DIFFICULTY WALKING SO WAS TAKEN TO DOCTOR; TOLD NO LIFTING OVER 10 LBS; NO BENDING, CRAWLING,