EE WAS SHOVELING SAND OUT OF THE BOX ABOVE THE ISC-82 CRUSHER. THE SAND WAS WET AND PACKED AND BECAUSE HE WAS REACHING OVER THE GUARD RAIL TO PERFORM THIS TASK HE PULLED A MUSCLE IN HIS FOREAR M. ALTHOUGH THE INCIDENT OCCURRED ON 4/19, THE COMPANY WAS NOT NOTIFIED THAT HE HAD OBTAINED MEDICAL TREATMENT UNTIL 5/2/.