EE WAS OPERATING A 5 MAN MANTRIP @ BRK #7 ON THE NORTH BOXCUT TRACK, TRAVELING OUTBY AT THE TIME OF THE INJURY. MANTRIP STARTED DOWN THE BIG DIP & HIT ANOTHER 9 MAN MANTRIP HEAD-ON @ THE BOTTO M. EE WAS THROWN OUT OF THE BUS ONTO THE MINE FLOOR. HE DID NOT HAVE CLEARANCE FROM DISPATCHER.