EMPLOYEES WERE ATTEMPTING TO SWING THE LID CLOSED ON A ROCKEATER USING A ROCKBAR. THEY HAD BEEN INSTRUCTED TO CLOSE IT BY MECHANICAL MEANS ONLY. WHILE PUSHING ON THE BAR, IT BROKE AND BOTH EMP LOYEES FELL APPROXIMATELY 10' TO THE GROUND. ONE LANDED ON HIS FEET AND HAD NO COMPLAINTS OF ANY INJURY. THE OTHER SCRATCHED THE LEFT SIDE OF HIS FACE AND UPPER BACK STRAIN.