Higher mining skill allows you to harvest more difficult minerals nodes around the world. If you cannot harvest a specific mineral, then increase your skill by mining easier to mine minerals in lower level areas.
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Smelt Bronze×2Known
Smelt CopperKnown
Smelt GoldKnown
Smelt IronKnown
Smelt MithrilKnown
Smelt SilverKnown
Smelt SteelKnown
LodestoneKnown