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Also, the Mindcrack guys and other youtubers are showing people how they dump multiple ores into the smeltery. This is a bad practice because you can end up creating unintended alloys. Gold and Silver become electrum, tin & copper become bronze, and almost sorts of combinations depending on your mod pack's selection of mods. It is best to just dump one type of ore at a time or only dump multiple types when you specifically want an alloy. If you really want to dump lots of ores, make multiple smelteries.