ALLEGED INCIDENT WAS TO HAVE OCCURRED WHILE THIS EE & CO-WORKER WERE PULLING PUMP OUT OF BIN. HE SAID HE STRAINED HIS BACK WHILE PULLING. CAUSE OF INJURY WAS OVER-EXERTION & NOT USING MECHANIC AL MEANS. COMPLIANCE WITH RULES/REGS NOT A FACTOR, PROTECTIVE EQUIPMENT NOT A FACTOR, MINING EQUIPMENT/SYSTEMS NOT A FACTOR, MINER PROFICIENCY A FACTOR.