From Dark and Darker Wiki

In order to obtain Ores you need to interact with Ore nodes using a Pickaxe. Ores can be crafted into Ingot and Powder.

Name Price Price / Slot Size Item Achieve Inventory Size Max Stack Size
20.542x25
10.2532x25
20.532x25
20.562x25
10.2522x25
20.552x25