WHILE WORKING ON DRAGLINE #2 TREVINO MINE, LIFTING A STEEL GUARD WITH THE HELP OF ANOTHER EMPLOYEE. THE STEEL GUARD WEIGHT APPROX 100 LBS, OTHEREMPLOYEE LET GO OF GUARD STILL HOLDING THE GUARD AND FELT A SHARP PAIN TO HIS LOWER BACK. AFTER SHARP PAIN NUMBNESS WENT TO LEGS.