THREE EMPLOYEES WERE INSIDE A BALL MILL INSTALLING LINERS. THEY WERE LIFTING THE LINERS UP THRU THE BOTTOM DOOR OF THE MILL WITH AN ELECTRIC HOIST SUPPORTED FROM A 2"" STEEL BAR THAT WAS NOT SE CURED. WHEN THEY SWUN THE LINER IN PLACE THE BAR SHIFTED & FELL INTO THE MILL THRU THE OPENING & STRUCK ONE EE ON THE HEAD, THE OTHER BETWEEN THE SHOULDERS (HE WAS NOT HURT).