v0.34:Metal industry

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The metal industry is a catch all phrase for both the smelting of raw ore into metal bar (as well as alloys) and turning those bars into crafts, furniture, weapons and armor. Some sort of metal industry is pretty much essential in any fortress, as without one your military will have to fight off invaders with wooden swords and leather armor. Because of metal's high base value, it can be a very profitable industry, allowing the creation of valuable statues and furniture for your fort or as trade goods. Specific information on the metals and ores themselves are covered at metal and ore, respectively, and will not be included on this page.

Metal Industry Flowchart.

Ores

Ores are naturally occurring stones that leave behind valuable material after being mined, and are your primary source of metal. Although metal bars can be imported via caravans, these come in very limited amounts; you will have to rely on native ores if you wish to build any sort of sizable metal industry.

The presence of useful ores is absolutely essential to a successful fortress. The site finder lists two different types of ore occurrence in a region: shallow metal(s), which indicates high z-level ore(s) on in the biome, and deep metal(s), which indicates low z-level ore(s) in the biome. Different biomes can contain different resources; as such, you should scroll through the region with the F keys to see all of the available resources by area. The exact position of your ores can be influenced by local factors; for instance, if you have embarked on a mountain adjacent to a flat plain, you can expect all of the ores to be located within the mountainside, and concentrate your search there. If you have neither shallow nor deep metals, surviving in the region will be very fun. Note that because they are easier to access and easier to find, shallow metals are generally preferred.

Different ores tend to occur in different stone layers and among different rocks; for instance, two of the ores of iron only occur in the sedimentary layer, while the third occurs both there and in the igneous extrusive layer. The type of surrounding rock is a clue as to the types of ores it contains. Within these rock layers, ores occur in veins, sinuous, single z-level groupings of the rock that weave through the stone layer in no discernible pattern (multi-layer veins are planned for future releases), or in clusters, smaller and more circular groupings of typically rare ores (like platinum). With luck, you might happen upon valuable ores while digging out your initial fortress, but generally finding your resources requires significant exploratory mining first, digging up a z-level to discover all of the goodies it contains.

Whenever you strike a new ore on a z-level, the game will announce its presence with the message "You have struck <ORE>!", similar to what it does for more mundane stones and for gems. Where there is one ore, there is an entire vein or cluster, and this is your cue to mine out the area to explore your new-found resource.

By default, ores are reserved for smelting; that is, they are unavailable for use by Masons and Stone crafters. If you have a found a significant deposit of ore, however, you may wish to change this behavior in the status menu to allow your dwarfs to make ore stone furniture and goods. Because most bars are not worth more then their base ores, this has the significant advantage of producing the same quality furniture or goods out of the rock as making a true metal object at the metalsmith's forge without costing fuel or processing first. Nobles may occasionally mandate the construction of ore-based goods.

Fuel

The metal industry consists of two parts: the ores from which the metals are made, and the fuel which powers the making. With the exception of studding, all metalworking requires a unit of fuel (or more, if it is part of the reaction itself). There are currently four types of fuel in Dwarf Fortress.

The simplest is ash, made from wood logs at a Wood Furnace by a Wood Burner. It necessary you produce a couple of bars of ash at the very least, as creating fuel from the other, mineral sources of fuel requires fuel itself. Ash can be used to jump start the process, but if your location is lacking in the other fuel sources, you will have to use ash exclusively (and whatever the caravans can bring in). Using ash as your main fuel source requires a lot of effort, and a heavily forested environment, as you will have to chop down many, many trees and potentially keep multiple burners on repeat to keep your metalworkers supplied, at least until you get down to the forth fuel source.

The next fuel source is coke, made from two types of depository coal: lignite and bituminous coal. When lignite is burned at a furnace, it consumes a unit of fuel while producing two units of coke, thus creating a net profit of one fuel; bituminous coal consumes one and produces three, for a net profit of two fuel (obviously being the better of the two). There is currently no way to know if a location does or does not have these resources, except with DHack (which is technically cheating).

The final fuel source is magma. Channelling a hole to a tile containing at least 4 units of magma will allow you to build magma forges, buildings that uses the heat of the magma instead of an actual fuel to do its work. The challenge is getting there; going down that deep requires passing through the caverns first, a feat to be concluded only by a fairly mature fortress. Once you hit magma, you will no longer need any other fuel source.

If you have neither trees nor one of the two coals on hand, getting your industry together will be extremely difficult. You will have to buy up every log and as much ash as possible, but if you do not have enough trees you will not have enough beds either; hurtling towards magma while avoiding the caverns is possible, although extremely risky. To avoid this problem, try not to embark in a location without wood.

Smelting

Ores cannot be made into metal objects raw; first they must be processed into metal bars by a furnace operator at a smelter. Smelting, like most metalworking, requires a unit of fuel; you can create fuel by making coke from either lignite or bituminous coal, as discussed above.

Smelting itself is pretty simple; make sure to have some dwarfs with furnace operating enabled, and be sure to set one or a few of your smelters to continuously smelt lignite or bituminous coal if you have them. Since bars have no quality modifiers, increased furnace operating skill only increases the speed with which the operator works; some ores can produce multiple metals when smelted, or randomly give you one of two. Smelters are very prone to cluttering, so having a non-filled bar stockpile and plenty of bins is important for efficiency. In addition you should make an ore stockpile nearby, to reduce your furnace operators' walking distance.

Alloys

Flowchart of ore refining and common alloy formulas.

Pure metal bars and, in some cases, ores can be combined at a smelter to produce metal alloys. These are special blends of materials that generally have an advantage over their components, be it in value, a unique color, decreased fuel consumption (when made directly from ores), or military application. For instance, brass can be smelted for a net gain in value, whereas rose gold is used for its unique color. In the case of bismuth, its only use (besides as a trade good) is as a component in bismuth bronze. For a complete list of alloys and their uses, see Metal#Alloys.

Flux stone

Easily the most useful alloy of them all is steel, which requires a complex series of steps to produce, as well as a resource which is not necessary for any of the other alloys: flux. Flux stones are carbon-rich stones that are used to temper iron into steel during the smelting process: calcite, chalk, dolomite, limestone, and marble. Although iron is a good weapons-grade metal, steel is a good deal better, and well worth the investment - if you have the resources. Unlike coal, flux stone appears on the location viewer when you are looking for a site to embark on, and if you want to have a powerful military, a location with flux stones and metals is key. If you have none, it is possible to import it via caravans. Flux stone also have the advantage of being worth more then more mundane stones, and are thus good stonecrafting and masonry material, if you have enough of it.

Goblinite

Goblinite is the humorous name given by players to the metal of enemy sieges (usually goblins, hence the moniker). If enemy combatants are killed, their corpses can give you real gains; when reclaimed, their metal arms and armor can be used as is or melted down into bars (except in the case of elves, which do not use metal equipment). Once an object has been marked, it will sent to a smelter with an active "Melt Object" job. When an object is melted a full bar will never be produced, the amount of metal recovered from an item is consistent and varies from 10%-60%. The incomplete bar is stored in the Smelter and a bar will be produced once the recovered meter reaches 100%.

The equipment of caged enemies can also be taken by mass dumping a caged creature (manually reclaim the caged creature via the k inspect menu to prevent it from being dumped too) and then reclaiming and marking for melting as explained above.

Smithing

Once you have the metal bars or alloys created, you are ready to turn them into your finished products at a metalsmith's forge.

Metal bars can be turned into a variety of products for use by your fortress, for the purpose of exporting low-weight items such as crafts are suggested. Four of the five metalsmith jobs are perpetrated at this stage:

• Weaponsmiths can create weapons, trap components, bolts, and ballista arrowheads
• Armorsmiths can create armor
• Metal crafters can create chains and "Other Objects" (crafts, coins, goblets), as well as performing studding
• Blacksmiths can create anvils, blocks, and all furniture except chains.

The metalsmith's forge also allows you to stud objects with your newly-created metal. This will give the object decorations and raise its value while consuming the metal bar - unlike every other process, however, it does not require fuel.