EE WAS LOADING A ROLL OF PLASTIC SCREEN INTO A JEEP. AS HE ATTEMPTED TO LIFT THE ROLL, HE TWISTED HIS BACK AND PULLED HIS LEFT SHOULDER. IMPROPER LIFTING TECHNIQUES MAY HAVE CONTRIBUTED TO THE INJURY. THERE WAS NO DAMAGE OR IMPAIRMENT TO THE MINING OPERATION OR TO ANY EQUIPMENT. THE INJURY DID NOT INVOLVE ANY ASPECT OF COMPLIANCE, JOB SKILLS, TRAINING, ATTITUDE, SAFETY DEVICES, OR