Originally posted by Mharr:

That might work as head canon if the recipe wasn't one ore per ingot. Not that I want to give IG any ideas about 'improving' that ratio!

You are right. If the ratio is one unit of ore to one unit of copper, then the fact that the copper weighs more means smelting on site is worse than useless. And it was so much fun.

Where did you obtain this information? Maybe I can impeach the source. :)