INJURED WAS IN THE PROCESS OF PUTTING THE CONVEYER CHAIN BACK TOGETHER ON THE CONTINUOUS MINER USING A CHAIN RATCHETT, A CO-WORKER WAS TIGHTENING THE CHAIN RATCHETT WHEN THE HOOK SLIPPED OFF OF THE CONVEYER CHAIN AND STRUCK INJURED ON THE RIGHT SIDE OF HIS FACE AT THE BASE OF HIS NOSE. THIS CAUSED A LACERATION FROM THE BASE TO THE TIP OF THE NOSE. FRACTURED MAXILLA BONE.