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So I finally found some decent amount of metal.
169 units, exactly. And 42 units of gold. Smelted them, left them on to smelt while I did other things for two minutes.
Then I decided to relocate my four furnaces closer to my mine entrance. And forgot to loving take the metal out of them first. Lost all of it.
So now I'm down to exactly 44 coal, since it was full stacks of coal put in the furnaces, 0 metal and one badly damaged metal pickaxe.
Needless to say, some excessive facedesking was in order. I've actually bruised my loving forehead.