INJURED EE WAS SHOVELING WITH A LONG HANDLE SHOVEL, CRUSHEDED ROCK & DUST SPILLAGE AWAY FROM SUPPORT STRUCTURE SO A BOBCAT LOADER COULD GET TO \IT. HE SHOVELED FOR ABOUT 20 MIN. & WHEN HE STOO D UPRIGHT HE FELT HIS LOWER BACK PULL ON THE RT.SIDE. HE SAW A DR. ON 3/24/03 & WAS PUT ON RESTRICTED DUTY & GIVEN A PRESCRIPTION MEDICATION.