The Smelter is the gate between raw ore and everything worth wearing or swinging in Valheim. Copper, tin, iron and silver are useless in their mined state, and the forge will not touch them until they have been through the furnace. The recipe is cheap, but it hinges on one item that only shows up in a dangerous place.
Quick answer: Pick up 5 Surtling cores from a Black Forest Burial Chamber to unlock the recipe, then build the Smelter with 20 Stone and 5 Surtling cores near a Workbench, on bare terrain or stone. Load ore into the left slot, coal into the right, and collect ingots from the chute at the front.
Surtling core locations in the Black Forest
The Smelter recipe stays locked until a Surtling core enters your inventory. Cores sit in Burial Chambers, the small stone dungeons dug into hillsides in the Black Forest. Three skeletons standing around outside is the usual giveaway that you have found one rather than a plain ruin.
Inside, the cores glow orange-red and are stashed in chests along corridors and side rooms. Surtlings, the small fire creatures, also drop cores, but they live in the Swamp and near lava, so the chambers are the realistic early-game route. Go in with leather or troll armor and a blunt weapon, since skeletons resist slashing.
Note: budget more than five cores. The Charcoal Kiln unlocks from the same item and costs another 5 cores and 20 Stone, and you will want it running before the furnace does.
If you are struggling to spot a chamber, the crow, Hugin, calls out when you get close to one, and the message log in the upper-right tabs of your inventory keeps every hint he has given you.
Smelter build cost and placement rules
Once a core is in your pack, the Smelter appears in the hammer’s build menu. Stone is the easy half of the bill: it lies loose on the ground in every biome, drops from Greydwarfs, and comes off rock formations and ore deposits when you mine them.
| Property | Value |
|---|---|
| Materials | Stone x20, Surtling core x5 |
| Unlocked by | Picking up a Surtling core |
| Built at | Workbench range |
| Durability | 2,000 |
| Footprint | 3 x 4.25 x 2.6 |
| Rain damage | No |
| Gives light | Yes |
Confirmation that it worked is immediate: the game prints “You have built a smelter” and Hugin follows up with the line about depositing raw ore to burn away impurities, plus a reminder that you need coal from a kiln to fuel it.
One more thing worth knowing before you commit to a spot: an active Smelter throws off the Fire effect roughly 4.5 meters out from every side, not just the face you interact with. Keep flammable clutter and yourself at a distance while it runs.
How to load the Smelter with ore and coal
Face the chute. That side is the front, which puts the ore opening on your left and the fuel opening on your right. Hold the material you want to insert and interact with the correct side; the furnace ignores anything it cannot process and will tell you “You don’t have any processable items” if you try the wrong item at the ore slot.
Smelting speed, fuel use, and capacity
The numbers do not divide neatly, which is the source of most confusion. The furnace holds more coal than a full ore load actually needs on paper, yet a full ore load still eats slightly more coal than one bar per two.
| Metric | Value |
|---|---|
| Time per bar | 30 seconds |
| Fuel burn rate | 1 coal every 15 seconds |
| Coal capacity | 20 |
| Ore capacity | 10 |
| Practical cost | Roughly 2 coal per ore |
Smelting time used to be 31 seconds per bar and was trimmed to 30 in update 0.208.1. Like the kiln and other processing structures, the Smelter fast-forwards while you sleep, so filling it before bed is the cheapest way to clear a backlog.
What the Smelter can process
Seven materials go in, and each one comes out as a bar or ingot you take to the forge. Black metal scrap and flametal ore are the exceptions, and they require a Blast Furnace instead.
| Material | Where it comes from |
|---|---|
| Copper ore | Copper deposits, Black Forest |
| Tin ore | Shoreline deposits, Black Forest |
| Scrap iron | Muddy scrap piles, Sunken Crypts in the Swamp |
| Silver ore | Silver deposits, Mountains |
| Copper scrap | Salvaged copper |
| Scrap bronze | Salvaged bronze |
| Iron ore | Iron deposits |
Copper and tin bars are the immediate payoff. Take two copper and one tin to a Forge and you get bronze, which opens up the next tier of tools, weapons and armor.
Why the Smelter stops working
A furnace that flickers on and off, or refuses to start, almost always comes down to one of four things.
- No coal in the right-hand slot. Ore alone does nothing.
- Smoke has nowhere to escape. Without venting above it, smelting halts.
- You are trying to insert an unsupported material, which returns “You don’t have any processable items”.
- The slot is full. Ore caps at 10 and coal at 20.
Pairing the Smelter with a Charcoal Kiln
Coal is the bottleneck, and the Charcoal Kiln is the fix. It costs the same 20 Stone and 5 Surtling cores, takes 25 wood at a time, and burns through regular wood before touching fine wood or core wood. Cooking food to a cinder also yields coal, and chests in the Black Forest occasionally hold some, but neither keeps pace with a running furnace.
If you only have five cores, there is a workaround. Build the kiln, stockpile roughly twice as much coal as you have ore plus a few spare, then knock the kiln down with your hammer and build the Smelter from the returned materials. Destroying either structure refunds everything used to make it, so you can flip between the two indefinitely.
Tip: place the kiln and Smelter angled slightly toward each other with a chest between them. From one spot you can refill the kiln, grab the coal, top up the fuel side, and drop finished ingots into storage without walking anywhere except to reload ore.
Once the pair is running, the rest of the game opens up. Bronze leads to a better pickaxe, the pickaxe leads to iron from the Swamp, and iron feeds everything from the Blast Furnace to the gear you will need on the Mountain. Build the furnace somewhere you can defend, keep the coal topped up, and it will quietly outlast most of your early bases.
