As it stands, to make a bar of metal from a bunch of melted stuff is very consuming of fuel if you lack magma.
One Plate mail armor? One Log o' Charcoal.
One bronze gauntlet? One Log o' Charcoal.
One Arrow or Coin? Yep One Log o' Charcoal.
Now the game will keep track of the percentages of metal we have, so we can have a half bar of copper, 3/4 bar of Bronze, and when it passes that threshold, it coughs up a bar.
It's very wasteful fuelwise.
A Tentative solution could be thus:
Melt a metal object (o)
&
Melt a Bars Worth (O)
This nifty idea notes that if a lavish meal takes 4 items that a dwarf would need to make four trips, one process, and poof! One Meal.
Melt a Bars Worth would take a quick counting of all melt tagged items, and if you can make a bars worth you'd get a sub window saying: Melt an Iron Bars Worth, Melt a Copper Bars Worth, etc. Then the dwarf would take all the items necessary, and with a single fuel piece, melt them all down to make a bar.
There are drawbacks to this, like a cook making lavish meals from a far away food stockpile, should it take too long to gather all the items to melt a bar, they could go to bed and then all of a sudden the peasants haul it all back. Like food problems, a pile nearby and sufficient skill to speed the process up would be useful.
But if nothing else,I can get rid of all them iron bolts and arrows in one fell swoop, and not waste 500 trees to do it. Not that I'm an elf lover mind you, but it is rather inefficient, and you'd think the dwarves would know better.
Can anyone see any problems with this? I mean, you'd probably trigger a "Not enough metal to make a bar" if you lacked enough meltables to make even one bar, but aside of that, you'd still have melt an object, and if you had 56/100 of a bar already, it could finish it off for you.
Just a thought from an Iron Workers son,
Mick E Finn