EE AND CREW WERE RIDING IN THE MANTRIP OF THE SURFACE,AT APPROX.25 CROSSCUT ON #3 BELTLINE. OPERATOR OF THE MANTRIP WARNED THE CREW THAT THE BRAKES WERE MALFUNCTIONING AND WOULD NOT SLOW THE MANTRIP. AT SOME POINT ON #3 BELTLINE MR MCKINNE JUMPED FROM THE MANTRIP CAUSING MULTIPLE STRAINS AND CONTUSIONS. THE MANTRIP DERAILED IN CURVE AT #2 BELTDRIVE STRIKING #1 BELTLINE