EE was driving haul truck from upper pit. There were ruts in the road from the rain the night prior. On EE's way down the ramp, EE hit one of the ruts, it jostled EE around, and EE felt discomfort in EE's back. On Sunday, June 19th, EE went to ER and they prescribed steroids and muscle relaxers and wrote EE out till Wednesday, June 22nd, making it reportable.