EMPLOYEE WAS GRINDING WELDS WITH THE HOPPER FOR THE NEW PRIMARY CRUSHER. HE WAS USING A 12' STEPLADDER. THE LADDER WAS NOT PULLED OUT AND STANDING ON ITS SHOES NOR WAS IT TIED OFF. THE EMPLOYE E HAS BEEN TRAINDED WEEKLY AND DAILY SAFETY MEETINGS. THE EMPLOYEE FELL APPROX. 8', LANDING ON HIS RIGHT SIDE AT THE BOTTOM OF THE HOPPER.