EMPLOYEE REPORTED: WALKING ALONG THE LONGWALL BLEEDER ENTRY INSPECTING THE CO MONITOR CABLE. EE WAS OBSERVING THE CABLE WHEN HE STEPPED ON A PIECE OF SLICK DRAW ROCK LAYING ON THE MINE FLOOR. HE SLIPPED AND TWISTED HIS LOW BACK RESULTING IN A POSSIBLE STRAIN TO THE LUMBAR SECTION OF HIS BACK.