THREE EMPLOYEES WERE WORKING INSIDE A BALL MILL INSTALLING LINERS, LIFTING THE LINERS UP THROUGH THE BOTTOM DOOR OF THE MILL WITH AN ELECTRIC HOIST SUPPORTED FROM A 2"" STEEL BAR THAT SPANNED T HE TOP DOOR OPENING. WHEN THEY SWUNG THE LINER IN PLACE, THE BAR SHIFTED AND FELL THROUGH THE OPENING INTO THE MILL, STRIKING ONE EE IN THE HEAD & THE OTHER BETWEEN THE SHOULDERS.