Cutting shot coke sacks into loader guys bucket with co-worker; co-worker was on L side and I was on Right; trying to get sack into bucket; was steadying left hand on loader bucket below sack & then we were both cutting sides & it fell down - weight of sack appr. 2700 lbs. material fell on left hand & couldn't pull it out. Called co-worker over & dug material & yanked my hand out.