Day 29

Charcoal Kiln at Old Iron Town Ut.
Turns out they stack wood (usually the cedar and pinion pine around the area)
into the smelter and then close the openings (there's another up the wall
on the other side) and burn the wood to turn it into charcoal that they used
to smelt the iron. There used to be 2 but the other has since collapsed
If you want some more info this site is pretty good