EMPLOYEE HAD ENTERED THE MUCK CAR TO MANTRIP OUT OF THE SLOPE FACE AREA. HE WAS UNAWARE THAT THE CAR HAD RESTED AGAINST THE MUCKER AND THERE WAS SLACK IN THE CABLE WHILE SITTING IN THE CAR IT SLID OFF THE MUCKER, TAKING UP THE SLACK AND STOPING ABRUPTLY SPRAINING HIS RIGHT ANKLE.