Horwath
Legend
iron ingot is clearly a broken version of the original ore iron.Interesting question: What happens when you cast Mending on separate pieces of a weapon that were never assembled into a weapon previously. Does magic know that you're not actually mending those pieces? Can you 'fix' an iron ingot into a sword because it's a terribly blunt sword right now?
So when you cast mending on iron ingot you get a lump of magnetite ore.