It's possible to farm it in level 41-50 easily and while in that range to farm [[coal]] by killing [[Dust Spirit]].
It's possible to farm it in level 41-50 easily and while in that range to farm [[coal]] by killing [[Dust Spirit]].
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A much more target-able way to farm both [[Coal]] and Iron Ore is to start level 50 where level 51 has a high likelihood of both [[Dust Spirit]]s and Iron Ore while 52 is a long narrow path to a guaranteed ladder. 53 is an infested level normally filled with [[Dust Spirit]]s and a free ladder to 54 if looking for more Iron Ore. Rinse repeat.