This pit is where I hope to smelt my copper ores in a charcoal fire. The bellows were constructed with two deer hides given to me as a gift. I did not head off into the woods with my stone tools and kill a deer, or pick apart a carcass for these, so there is another invisible technological process that has taken place. Still, a deer hide is a reasonable thing to assume for most parts of history, and I worked the hides entirely with stone and bone tools. I did get the bones from a carcass. yum.