Blast Furnace
MembersOld School RuneScape minigame · OSRS TCG card mapping
A Smithing minigame built around a conveyor-belt furnace that only needs half the coal an ordinary furnace does, making it the fastest way to smelt bars in bulk — especially the coal-hungry ones like steel and up. Official worlds have dwarves running the machinery, so most players just keep the ore and coal coming.
Blast Furnace is a members Old School RuneScape minigame needing Smithing 15, found at Keldagrim, the dwarven city beneath the mountains east of Rellekka. The short version: ore for the bar you're making and coal, for steel and anything past it. This page maps Blast Furnace to the OSRS TCG — the card game played through the RuneLite plugin — listing what you take in, grouped by what each item is for, with every item linked to its card. The OSRS Wiki remains the guide to playing it.
Full guide on the OSRS Wiki →Before you can take part
- RequiresSmithing 15The real floor — 60+ is only recommended for efficient bars. Separately, the anvil beside the furnace needs its own 60 Smithing to use at all, for smithing bars into gear rather than smelting ore.
- RequiresThe Giant DwarfOnly needs to be started, not finished — that's what lets the Dwarven Boatman ferry you into Keldagrim in the first place.
Feeding the furnace
Everything that matters happens at the conveyor belt: ore goes in, bars come out, and on an official world a dwarf does the actual smelting for you — you just keep running ore and coal to the belt. The ore's own Smithing level is the only gate on what you can make; the Blast Furnace changes the coal cost, not the ore's requirement.
- Any ofOre for the bar you're making
- Copper ore
- orTin ore
- orIron ore
- orSilver ore
- orGold ore
- orMithril ore
- orAdamantite ore
- orRunite ore
- orLead ore
- orNickel ore
Any of these works — whichever matches the bar you want and the Smithing level you have.
- RequiresCoal, for steel and anything past it
Halved here compared to a normal furnace — the entire reason people bring higher-tier ore to Keldagrim instead of smelting it at home.
- OptionalSomething to cool your hands with
Fill it at the pump so you can lift hot bars off the belt bare-handed. Ice gloves and smiths gloves (i) do the same job but aren't catalogue cards.
Carrying more coal
A coal bag roughly doubles how much coal you can carry on a single trip, which is most of what determines how many bars you smelt per bank run.
- OptionalCoal bag
Cuts your bank trips in half by holding a second load of coal outside your regular inventory space.
Skipping the entrance fee
Official worlds charge 72,000 coins an hour to cover the dwarves running the machinery. Two alternative strategies avoid that fee entirely — manually operating an unofficial furnace yourself (which needs 30 Agility, Crafting, Firemaking and Strength), or world-hopping between free worlds (30 Agility) — at the cost of doing the legwork the dwarves would otherwise handle.
- OptionalA hammer
Needed to work an unofficial furnace's machinery yourself as part of manual operation.
- OptionalA spade
Also for manual operation, used on the furnace's coal side.
- OptionalA spadeful of coke
Consumed while manually stoking an unofficial furnace.
- OptionalImcando hammer
Worn in the off-hand to free an inventory slot — a common pick for the fee-free world-hopping route.
What you smelt
The bars the furnace actually produces, whichever ore (and Smithing level) you fed into it.
- Any ofThe bars you produce(optional)
- Bronze bar
- orIron bar
- orSilver bar
- orLead bar
- orSteel bar
- orGold bar
- orMithril bar
- orAdamantite bar
- orCupronickel bar
- orRunite bar
Whichever bar your ore and Smithing level allow — the furnace itself doesn't add any tiers beyond a normal one.
Handy extras
One more thing worth carrying if you're using an official world.
- OptionalCoins, for the official-world fee
72,000 coins an hour (12gp/tick), taken from the coffer near the bank chest while using an official Blast Furnace world.
Every card on this page (28)
Resource
This needs refining.
Resource
This needs refining.
Resource
This needs refining.
Resource
This needs refining.
Resource
This needs refining.
Resource
This needs refining.
Resource
This needs refining.
Resource
This needs refining.
Resource
This needs refining.
Resource
This needs refining.
Resource
Hmm a non-renewable energy source!
Resource • Consumable
It's a bucket of water.
Resource • Consumable • Asgarnia
You can carry coal in here.
Resource
Good for hitting things!
Resource
A slightly muddy spade.
Resource • Consumable
A spadeful of refined coal.
Resource • Weapon • Asgarnia
It's good for holding and hitting things!
Resource
It's a bar of bronze.
Resource
It's a bar of iron.
Resource
It's a bar of silver.
Resource
It's a bar of lead.
Resource
It's a bar of steel.
Resource
It's a bar of gold.
Resource
It's a bar of mithril.
Resource
It's a bar of adamantite.
Resource
It's a bar of cupronickel.
Resource
It's a bar of runite.
Resource • Clue • Barrows
Lovely money!
Blast Furnace — frequently asked
- What is the minimum you need for Blast Furnace?
- Ore for the bar you're making and Coal, for steel and anything past it, plus Smithing 15. Everything that matters happens at the conveyor belt: ore goes in, bars come out, and on an official world a dwarf does the actual smelting for you — you just keep running ore and coal to the belt. The ore's own Smithing level is the only gate on what you can make; the Blast Furnace changes the coal cost, not the ore's requirement.
- What level do you need for Blast Furnace?
- Smithing 15. The real floor — 60+ is only recommended for efficient bars. Separately, the anvil beside the furnace needs its own 60 Smithing to use at all, for smithing bars into gear rather than smelting ore. It is members-only.
- Do you need a quest for Blast Furnace?
- The Giant Dwarf is required. Only needs to be started, not finished — that's what lets the Dwarven Boatman ferry you into Keldagrim in the first place. It is members-only.
- Which OSRS TCG cards are tied to Blast Furnace?
- Every item on this page that exists in the catalogue is linked to its card, grouped by what it is for. Cards are pulled from packs in the OSRS TCG RuneLite plugin, and you can trade for the ones you are missing on OSRS Card Exchange.
- Is there an OSRS TCG card for Blast Furnace itself?
- No. The OSRS TCG has cards for Old School RuneScape's items and monsters, not for its minigames — so there is no "Blast Furnace" card. What this page maps is the other way round: the items Blast Furnace asks you to bring, each one linked to the card that depicts it.