EE AND #2 SECTION CREW BOARDED THE MANTRIP TO THE SURFACE. AT APPROX. 25 CROSSCUT ON #3 BELTLINEOPERATOR OF THE MANTRIP WARNED THE CREW THAT THEBRAKES WERE MALFUNCTIONING AND WOULD NOT SLOW TH E MANTRIP. AT SOME POINT ON THE #3 BELTLINE EE JUMPED FROM THE MANTRIP CAUSING MUSCLE STRAINS. THE MANTRIP THEN DERAILED IN A CURVE AT #2 BELT DRIVE STRIKING THE #1 BELTLINE.