EE STATED THAT HE WAS A PASSENGER ON PARTS JEEP TRAVELING FROM UNDERGROUND TO SURFACE. THE JEEP OPERATOR OBSERVED TRACK ROOF BOLTER ON TRACK @ #3 CURVE. HE APPLIED BRAKES IN ATTEMPT TO AVOID C OLLISION W/TRACK BOLTER THAT WAS IN OPERATION BOLTING TOP. JEEP STARTED TO SLIDE ON RAILS. THE PASSENGER DISMOUNTED FROM JEEP WHILE IT WAS IN MOTION & IN DOING SO INJURED LT ANKLE & RT SHOULD