A ROOF BOLTER OPERATOR ON THE H/G 101 SECTION WAS INSTALLING THE WRENCH ONTO A ROOF BOLT. HE INADVERTENTLY USED THE WRONG LEVER TO RAISE THE MAST. IN DOING SO THE OPERATOR ACTIVATED THE CLOSE JAW FUNCTION ON THE DRILL GUIDE SYSTEM. THE OPERATOR'S FINGER WAS IN A POSITION THAT ALLOWED THE JAWS TO CLOSE AROUND HIS FINGER CAUSING THE INJURY AND REQUIRED SOME STITCHES.