From Dark and Darker Wiki
Crafting
Ores and mob drops can be used for Crafting. Crafting is done through Traders
Ores
Ores can be extracted from ore Deposits located throughout the various maps. Ore Deposits can be mined by equipping a Pickaxe from your quickslots.
Ores in the game:
Herbs
Herbs can be harvested in the Ruins
Herbs in the game:
Refined Materials
Ores can be crafted into refined materials in game: