ALLEDGED INCIDENT WAS TO HAVE OCCURRED WHILE THIS EMPLOYEE AND HIS CO-WORKER WERE ATTEMPTING TO RAISE THE BOTTOM BELT UP. CAUSE OF THIS INJURY WAS OVEREXERTION, IMPROPER LIFTING. COMPLIANCE WI TH RULES/REGS A FACTOR; MINER PROFICIENCY A FACTOR. SAFETY EQUIPMENT NOT A FACTOR; MINING EQUIPMENT/SYSTEMS COULD BE A FACTOR.