EMPLOYEE HAD BEEN SHOVELING, BENT OVER TO PICK UP A BAG OF ROCK DUST. WHEN HE STRAIGHTENED UP HE FELT A PULL OR PAIN IN LOWER BACK. COMPLETED SHIFT BUT STATED PAIN DIDN'T GET ANY BETTER. MISSE D 2 DAYS, CAME BACK & WORKED PART OF A DAY BEFORE STARTED MISSING AGAIN.