Slag

A by-product tapped from the blast furnace.

The recovered form of the furnace's slag: chip it from a frozen canal cell or a set Molten Barrel with a chisel and hammer, at 5 units per bit, the same rate as every other metal recovery in the mod. Grind it into Powdered Slag for fertilizer and mortar, or pave with it directly as Slag Path. See Slag and its products for where it comes from and everything it can become.