⚠️ Eco v0.14 is coming — the next major update reworks upgrade modules, so some of these numbers will change. They reflect the current version. What’s changing →
  • Simpler tiers: the 1–4 tiered upgrades become a single Basic / Advanced / Modern upgrade each.
  • Permanent upgrades: a module placed in a workstation is permanent — no more swapping lower tiers out as you progress.
  • Power transitions: a module can change a station’s power type/draw (e.g. a Modern upgrade moves a sawmill from mechanical to electrical power).
  • Talent-integrated: modules now use the same bonus/talent system — any talent benefit (power, labor cost, recipe unlocks) can come from a module.
  • Cheaper to upgrade: with the multi-tier parts gone, fully upgrading a workstation costs significantly less.

We’ll update this calculator shortly after the update releases.

HomeItemsSlag

Slag

Slag

A glass-like byproduct that is created when smelting ore. Crushed Slag is often used in the production of Concrete.

Weight6000 gMax stack20Carried on backResource pileSkillAdvanced Smelting Lv 1StationBlast Furnace

Notes

Slag is a glass-like byproduct created when smelting ores such as copper, iron, and gold, appearing as a solid block that can be excavated with a tier-4 pickaxe. Classified as a waste product, it stacks to 20 and can be carried on the back or stored in resource piles. Rather than discarding it, players should process slag into Crushed Slag for use in concrete production, turning a smelting byproduct into a valuable building material.

Notes are AI-generated and may be imprecise.

⚙ Craft calculator — adjust for your modules, skill & talents
Upgrade modules
Talents

Ingredients

IngredientQtyType
Iron Concentrate1item
Ceramic Mold4item
Quicklime4item
Charcoal8item

Crafting

Labor60 calories
Craft time1.5 min
Throughput160 Steel Bar / hour (base)

As a block

Mining hardness4On miningdrops rubbleSolidWall
Mining

Hardness 4 is the minimum pickaxe tier that can mine this block.

Yields1× SlagCalories/block20Durability/block1Cal / stack1000

Cost shown for a Modern Pickaxe at Mining level 0. Set your level / talents in the ⚙ Character panel to recompute. ≈ estimate.

Total raw to craft this

Steps10Total labor1537.5 calTotal time20.78 min

Approximate โ€” category ingredients and any production cycles are counted as raw.

Categories

Obtained from

Blast Furnace
Bloomery

Used in

Jaw Crusher
Stamp Mill

See also