EE AND #2 SECTION CREW HAD BOARDED THE MANTRIP TO THE SURFACE. AT APPROX. 25 CROSSCUT ONT HE #3 BELTLINE OPERATOR OF THE MANTRIP WARNED THE CREW THAT THE BRAKES WERE MALFUNCTIONING AND WOULD N OT SLOW THE MANTRIP. AT #2 BELTDRIVE IN A CURVE THE MANTRIP DERAILED HE WAS RIDING ONT HE OUTBY END AND DID NOTJUMP. HE STUCK ONLY REMEMBERING WOAKING ON THE MINE FLOOR SHORT DISTACNE FROM MA