EE WAS EXTRACTING RAW MATERIAL FROM THE NORTH WALL OF THE [PIT AND LOADING THE RAW MATERIAL ONTO THE TRUCK THAT COWORKER OPERATED. EE POSITIONED THE EXCAVATOR PARALLEL W/ THE NORTH WALL. AT ~1 415 COWRKER RETURNED FROM THE STOCKPILE AREA TO THE PIT AREA & NOTCIED THAT THE NORTH WALL HAD COLLAPSED & FALLEN IN ON THE EXCAVATOR. CALLED 911 & WENT TO RESCUE EE. EE WAS RESCUED & TAKEN T