EMPLOYEE WAS LIFTING UP THE MINER CABLE TO HANG FROM THE ROOF. HE SAID HE FELT PAIN IN LOWER BACK. CAUSE OF INJURY WAS OVEREXERTION. COMPLIANCE WITH RULES/REGS WAS NOT A FACTOR, SAFETY PROTECT IVE EQUIP WAS NOT A FACTOR, MINER PROFIENCY WAS A FACTOR, MINING EQUIP/SYSTEMS NOT A FACTOR.