EMPLOYEE WAS CLEANING LARGE STONES OFF TOP OF THE CONTINUOUS MINING MACHINE. HE HAD A STONE BAR UNDER A LARGE STONE AND WAS PUSHING UP ON BAR TO MOVE THE STONE. HE FELT PRESSURE IN LOWER LEFT ABDOMEN. HE LATER OBSERVED A SMALL LUMP IN HIS ABDOMEN. NO DAMAGE OR IMPAIRMENT OCCURRED TO MINING OPERATION OR EQUIPMENT. INJURY DID NOT INVOLVE COMPLIANCE, JOB SKILLS, OR PROFICIENCY.