Guess cause it holds hear so well.

True story.
We go to Tellico trout fishing each year. We camp along the river. One morning after breakfast we got to missing a member of our group. He's a bit older but we weren't concerned. After a while he came walking back up the river bank with one of my buddies big cast iron pans. Then he says "This thing was so dirty I had to take a rock to scrub all the black off." Inside of that thing was shinny as a new dime. He had no idea. Buddy just slung it a far as he could up the hill. That's been 20 years ago and bet it's still there.