EMPLOYEE STATED THAT HE WAS OPERATING A FRONT END LOADER IN SHOT MATERIAL. AS HE WAS LOADING A HAULER, HE BACKED INTO A HOLE CAUSING THE LOADER TO TILT AND JAR HIM. HE STATED THAT PAIN IN THE LOWER BACK AREA BEGAN WITH IT RADIATING DOWNHIS LEFT LEG. WENT TO DR. ON 11-09-01 AND INCURRED LOST WORK DAYS.