EE WAS USING A LONG ROOF BOLT TO PUSH SCREEN WIRE MESH AGAISNT THE MINE ROOF IN A HIGH TOP AREA 12 FEET HIGH. THE SCREEN WAS BEING FIELD TOGETHER SO IT COULD BE BOLTD TO THE ROOF. AS HE PUSHED HE ROOF BOLT UP HE FELT SO IT COULD BE BOLTED TPAIN IN HIS LOWER BACK. THERE WAS NO DAMAGE OR IMPAIRMENT TO THE MINING OPERATION THE INJURY DID NOT INVOLVED COMPLAINE JOB SKILLS, PROF, TRAINI