EE WAS UNCLOGGING CONE CRUSHER. HE STEPPED BACK ON THE WALK WHICH WAS PILED WITH DEBRIS OUT OF THE CRUSHER WHEN HE MISSTEPPED, FALLING OFF WALK DOWN ONTO SAFETY GUARD OVER THE TOP OF THE PIT L ANDING ON HIS FEET. HE THEN SLID DOWN THE GUARD FALLING TO THE GROUND BELOW APPROX. 4'