EE WAS PATCHING A HOLE IN CLEAN COAL SIEVE. WHEN HE SLIPPED, HITTING HIS BACK ELBOWS AND BACK OF HIS LEGS AND KNEE ONT HE SIDE AND BOTTOM OF THE HOPPER. AFTER THIS INCIDENT HIS BACK STARTED HU RTING ESPCECIALLY AFTER LIFTING ON A PIPE ON JULY 11 OUT IN THE PREP PLANT YARD EE CONTINUED TO WORK AND WAS TREATED FOR LOWER BACK PAIN OVER THE NEXT 5 TO 6 WEEKS. HE WAS NOT ABLE TO WORK ON