A miner was loading ground support bolts, EE leaned down to load supplies and felt a sharp pain in lower back. Self-treated until leaving site for R&R on 06/29; 06/30 & 07/01/17 saw a chiropractor then physician on 07/03/17, whom placed EE on physical therapy and Unable to return to work from 07/03/17 - 07/11/17. EE's normal schedule is 2:1; with return for work on 07/06/17.