Not sure where else to put it, but personally I feel like being able to smelt tool parts if you replaced a pickaxe head (as an example) would be pretty nice, if the tool part is damaged, you could do something like salvageCost = origPartCost - ((origPartCost / totalDurability) * (totalDurability - currentDurability)) rounded down to the nearest whole unit (nuggets, most likely).
Not sure where else to put it, but personally I feel like being able to smelt tool parts if you replaced a pickaxe head (as an example) would be pretty nice, if the tool part is damaged, you could do something like
salvageCost = origPartCost - ((origPartCost / totalDurability) * (totalDurability - currentDurability))rounded down to the nearest whole unit (nuggets, most likely).