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.
Recipes of pixel-chen7 of 17 known172 / 225
Smelt Bronze×2Known
Smelt CopperKnown
Smelt GoldKnown
Smelt IronKnown
Smelt SilverKnown
LodestoneKnown