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40d:Refined coal
Fuel is used to power high-temperature industries, namely metalworking and glassworking. One unit of fuel is required for every task at a smelter, metalsmith's forge, kiln, or glass furnace.
Fuel can be created by converting wood into charcoal at the wood furnace, or by refining coke from bituminous coal or lignite at the smelter.
Also, fuel is necessary in the production of steel and pig iron, even if using a magma smelter
Charcoal
- Required Building - Wood furnace
- Required Material - Wood
- Required Skill - Wood burner
Charcoal can be created at a wood furnace using one wood log by a dwarf with the Wood Burning skill on.
Coke
- Required Building - Smelter
- Required Material - Bituminous coal or lignite
- (fuel will be needed to power this at a normal smelter)
- Required Skill - Furnace operating
Coke is a type of fuel used to fuel non-magma furnaces. It is created at the smelter from bituminous coal, yielding 3 coke, and lignite, yielding 2.
Veins of lignite and bituminous coal will be ignited by magma, destroying the whole thing in a raging inferno.