LAB TECHNICAN WAS CRUSHING COAL SAMPLE-LIFTING TRASH CAN OF COAL TO HOPPER OF CRUSHER-HE APPARENTLY STRAINED ABDOMINAL MUSCLES WHILEWORKING-EE DID NOT SAY ANYTHING TO CO-WORKERS OR REPORT TO S UPERVISOR HE WAS HURT-CALLED IN THE NEXT DAY AND REPORTED HE WOULD BE OFF 2 WEEKS.