For every steel bar you want to make, you take 1 iron ore and 2 coal ores to a furnace, and use the iron ore on the furnace. Alternately, you can also use the magic spell "Superheat item" (without needing to go to a furnace).
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this is a fairly easy question. make a steel bar ( smelt iron and 2 coal ) and use the steel bar on the furnace ( NOTE: remember to have an ammo mould ) and choose the amount of bars to make the cannon balls. each bar makes 4 cannon balls.
a sapphire from an uncut sapphire by using a chisle on it, and smelt a gold bar into a sapphire necklace.
You do not mine steel ore. Steel ore does not even exist! You may have thought that because of a steel bar. Well, to get a steel bar, you have to use one iron ore and two coal ores.
By Gold bars of course!!!
Copper, to make Bronze.