THE EE WAS UNLOADING A STEEL BAR FROM A UNDERGROUND VEHICLE TO THE MINE FLOOR. IN THE PROCESS OF PULLING THE BAR OUT OF THE VEHICLE HIS THUMB WAS PINCHED BETWEEN THE FRAME OF THE VEHICLE AND STEEL BAR CAUSING A SIMPLE FRACTURE OF THE THUMB. THE BAR MEASURED APPROXIMATELY 4' TALL BY 6"" WIDE BY 1"" THICK.