E IN THE PROCESS OF CLEANING OUT A 55 GAL OF USED GRINDING BALLS AT THE SAG MILL. AS HE WAS PULLING ON THE DRUM TAG LINE TO MOVE THE BALLS(THE DRUM WAS SUSPENDED BY AN OVERHEAD CRANE), HE FELT A POP IN HIS LEFT FOOT FOLLOWED BY PAIN. TAKEN TO ER WHERE X-RAYS WERE TAKEN. X-RAYS CONFIRMED A BREAK HAD OCCRRED IN METATARSAL BONE IN HIS LEFT FOOT. FITTED W/WALKING CAST & RESTRICTED DUTY