THE MINER WAS INSTALLING WIRE. HE HAD PROPPED THE WIRE TO HOLD IT WHILE HE PREPARED TO DRIVE ANOTHER BOLT, HE STARTED THE BOLT IN THE HOLE BY HAND, HE BENT DOWN TO GET THE DRIVER. THE PROP SLI PPED. AS THE WIRE DROPPED IT POPPED THE BOLT FROM THE HOLE. THE BOLT FELL STRIKING THE MINER CAUSING THE CUT TO THE MINERS EYEBROW.