MEMBER WAS HOLDING THE LID OF THE RAW COAL DISTRIBUTOR WITH ONE HAND (HOLDING IN RAISED POSITION) AND WAS TURNING THE DISTRIBUTOR WITH HIS OTHER HAND WHEN HE STRAINED HIS BACK. HE COMPLETED HI S SHIFT ON 7/17/02 AND WORKED 7/18/02, 7/19/02 AND 7/20/02. HE BEGAN MISSING WORK 7/22/02.