A Furnace. Use it to smelt mined ore.
- x75 Metal Fragments
- x38 Metal Fragments
The furnace smelts one item from each stack at the same time. Since the furnace has 6 slots, it is wise to have one slot for wood, 3 slots for the un-smelted resource, one empty slot for charcoal, and one empty slot for the smelted output.