EE WAS WORKING ON A CREW EXTRACTING A CONTINUOUS MINER WHICH HAD BEEN COVERED IN A ROOF FALL. THE CREW HAD CONNECTED THE MINER EXTRACTOR TO THE REAR OF THE MINER AND STARTED TO TAKE UP THE SLA CK IN THE CHAIN. AS THE CHAIN TIGHTENED A CLEVIS BROKE AND A PIECE OF THE CLEVIS FLEW APPROX 55' AND STRUCK THE EE ON THE LEFT ARM.