EE STATES THAT HE WAS COMING OUT OF PIT ON A MODERATE INCLINE LOADED WITH ROCK ON HIS FIRST LOADOF THE DAY. THE EUCLID STALLED AND HE APPLIED THE EMERGENCY BRAKE. IT HELD ON FOR AWHILE THEN ST ARTED ROLLING BACKWARDS AND RUN UP ON A SIDE ENBANKMENT AND EASED OVER ON ITS PASSENGER SIDE.SEAT BELT WERE UNAVAILABLE BUT SOME UNEXPLAINED REASON THE EE WAS NOT USING IT.