EE WAS ASSISTING ANOTHER EE IN LIFTING A RAM JACK THAT WAS LYING ON THE MINE FLOOR BETWEEN THE SHIELDS &FACE. A CHAIN WAS PLACED IN THE EYE OF THE JACK & BOTH EE'S ATTEMPTED TO LIFT IT ONTO THE PONTOONS. IT WAS DURING THAT TIME THAT INJ EE SAID HE EXPERIENCED A BURNING SENSATION IN HIS BACK