EE WAS GIVING HIS CO-WORKER A BACK SIGHT WHILE SURVEYING THE SECTION. HE HAD TO GET INTO THE FEEDER TO GIVE THIS SIGHT,UPON GETTING OUT OF THE FEEDER HE SLIPPED ON LOOSE COAL & TWISTED HIS KNEE. CAUSE OF INJURY WAS SAFETY AWARENESS. COMPLIANCE WITH RULES/REG. WAS NOT A FACTOR, SAFETY EQUIPMENT NOT A FACTOR, MINER PROF. A FACTOR, MINING EQUIP. SYSTEMS NOT A FACTOR.