To be more realistic (and to require steps beyond just melting the slag, like how GT6 uses coal to reduce iron ore) shouldn’t you find iron oxides in your ore instead of pure iron? Or are the mixed piles going to represent this by having oxygen pixels or something in them? Also from the crucible discussion it sounds like you could just throw everything in and separate it by temperature, when in reality something like metal ores would have slag trapped between the metal (assuming the metal has a higher melting point). Not sure how you would simulate that, maybe material piles contain grains of material which would be made of pixels. Then grinding down your ore increases the fraction of slag that is free to melt off.
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