EMPLOYEE WAS SHOVELING DEBRIS FROM CONVEYOR WHEN HE FELT SOME DISCOMFORT IN LOWER BACK. HE CONTINUED TO WORK AND ADVISED SUPERVISOR THE NEXT DAY THAT BACK WAS SORE BUT SAID HE COULD WORK AT NORMAL DUTIES. HE ADVISED SAFETY MANAGER ON NOV 23RD THAT HE WAS EXPERIENCING SIGNIFICANT PAIN. HE WAS SENT TO MEDICAL FACILITY FOR EVALUATION NOV 24TH.