Hello there!
I'd like to suggest that when mining ore, you get a few experience points per ore, increasing with rarity (so copper ore would be like 1 exp per ore, iron 2 exp etc), instead of just having us gain experience with smelting.
Leveling mining is tedious the way it is now and I'd appreciate if there was a way to level faster. (I always have wheels and pickaxes equipped, but it is still so slow.)