Old School RuneScape Wiki

The Blast Furnace is a members-only minigame situated in Keldagrim for smelting bars which require coal. The furnace here only requires half as much coal when smelting usually, so it can be useful when smelting the ores that require more coal.

The Blast Furnace worlds on Old School RuneScape are Worlds 352, 355, 358, 386 and 387. They enable soloing the Blast Furnace easily as there are five different dwarves (Dumpy, Stumpy, Pumpy, Numpty and Thumpy) operating the mechanics of the Blast Furnace, so the player only has to focus on running the ores to the conveyor belt.


The Blast Furnace can be accessed in East Keldagrim by going downstairs in the building with the furnace icon.

  • Smithing level 60 (cannot be boosted) or a 2500-coin fee to smelt bars with the furnace for 10 minutes. The Ring of charos (a) does reduce the entrance fee. (You must manually click on the Blast Furnace Foreman and engage in dialogue where you will see the option for a reduced fee if wearing your ring of charos. Using quick pay through right clicking will NOT work) (Chat 1-3-2-3)
  • Ice gloves or Bucket of water (optional), used at the bar dispenser to cool the heated bars as they come out. If you do not have either, you must wait for the bars to cool before taking them out.
  • Coins to be able to use the blast furnace in designated worlds. It costs 72K gp/hour to be able to use it. You have to put it in the coffer near the bank chest. Note that if you leave the area and/or hop worlds, the coins in the coffer will NOT keep on decreasing.

Travelling and getting to the Blast Furnace

From Seers' Village or Camelot, follow this path.

After arriving in Keldagrim, go to the east side of town and downstairs in the building marked with the furnace icon.

The Blast Furnace is located in Keldagrim. To enter Keldagrim, the player must have started the quest The Giant Dwarf by speaking to the Dwarven Boatman within the mines east of Rellekka. The map on the left shows a path the player can take walking from Seers' Village/Camelot to the mines east of Rellekka. Once the player has visited Keldagrim at least once, they can return via mine cart from the Dwarven Mines under Ice Mountain or the Grand Exchange, or use the Minigame Group Finder to teleport right outside the Blast Furnace building.

Suggested materials/inventory setups

A map of the Blast Furnace room itself.

  • Note: Remember to deposit coal first if not working with pure iron!

It is heavily recommended to wear weight-reducing clothing to save run energy while moving heavy ore and smelted bars; if you are using ice gloves you won't be able to benefit from the full graceful outfit bonus and it will be more efficient to use the spottier cape and boots of lightness rather than their graceful counterparts. Coins can also be used to pay the Blast Furnace Foreman for more time or to purchase ore there from Ordan.

Coins 10000.png Stamina potion(4).png Bucket of water.png Iron ore.png
Iron ore.png Iron ore.png Iron ore.png Iron ore.png
Iron ore.png Iron ore.png Iron ore.png Iron ore.png
Iron ore.png Iron ore.png Iron ore.png Iron ore.png
Iron ore.png Iron ore.png Iron ore.png Iron ore.png
Iron ore.png Iron ore.png Iron ore.png Iron ore.png
Iron ore.png Iron ore.png Iron ore.png Iron ore.png

Below 60 Smithing

Coal bag.png Stamina potion(4).png Coal.png Coal.png
Coal.png Coal.png Coal.png Coal.png
Coal.png Coal.png Coal.png Coal.png
Coal.png Coal.png Coal.png Coal.png
Coal.png Coal.png Coal.png Coal.png
Coal.png Coal.png Coal.png Coal.png
Coal.png Coal.png Coal.png Coal.png

The suggested inventory for players below 60 Smithing is coins (to pay the fee every 10 minutes), a stamina potion, a bucket of water, and 25 ore. When using ice gloves, replace the bucket of water with an ore.

60 Smithing and above

The suggested inventory for players 60 Smithing and above is a coal bag, which helps greatly, a stamina potion, a bucket of water, and 25 ore. When using ice gloves, replace the bucket of water with an ore.

Experience rates

Full Smithing experience is gained from smelting the bars. There is also an anvil nearby to smith your bars, but it requires level 60 Smithing to access.

At the Blast Furnace, the following Smithing XP can be gained producing bars. Moreover, the following assumes that the player has a coal bag and a stamina potion in his or her inventory and wearing Ice Gloves, thus there are 26 inventory slots occupied by ore.

Bar Type Coal Needed
(in bag + in inventory = total)
Primary Ore # of Bank
Trips (from bank to furnace)
Bar Yield Total
XP [1]
Steel 26 + 0 = 26 26 Iron ore 1 26 455
Mithril 26 + 26 = 52 26 Mithril ore 2 26 780
Adamantite 26 + 26 + 26 = 78 26 Adamant ore 2 26 975
Runite 26 + 26 + 26 + 26 = 104 26 Rune ore 3 26 1,300
  1. You also get 1 XP per additional person loading if you help out. For example, if there are four other people excluding yourself, you'll get 4 Smithing XP extra.


The number of bars per hour will vary depending on team size and how quickly pipes are fixed.

Bars that can be produced via the Blast Furnace.
  • Bronze: 2,500 - 2,850 bars per hour
  • Iron: 5,000 - 5,700 bars per hour (Blast Furnace has a 100% ore to bar ratio for iron)
  • Steel: 3,000 - 3,500 bars per hour
  • Gold/Silver: 5,000 - 5,700 bars per hour
  • Mithril: 2,500 - 3,000 bars per hour
  • Adamantite: 1,800 - 2,000 bars per hour
  • Runite: 1,500 - 1,600 bars per hour

Experience per hour*

  • Bronze: 15,000 - 18,000 XP per hour
  • Iron: 60,000 - 70,000 XP per hour
  • Steel: 50,000 - 60,000 XP per hour
  • Silver: 68,000 - 78,000 XP per hour
  • Gold WITHOUT Gauntlets: 110,000 - 130,000 XP per hour
  • Gold WITH Gauntlets: 280,000 - 330,000 XP per hour
  • Mithril: 75,000 - 80,000 XP per hour
  • Adamantite: 75,000 - 80,000 XP per hour
  • Runite: 75,000 - 80,000 XP per hour

Money making methods

The Blast Furnace provides a great opportunity for players to reap great profits by producing a large volume of bars. Note: Don't forget to subtract 72k coins per hour, if using worlds 352, 355, 358, 386, or 387. These numbers assume you are using one of the above worlds, a coal bag, ice gloves, and stamina potions. Always check current selling prices, as these numbers can change frequently.

Level Bar Method Profit
15 Smithing icon.png
Iron bar Iron bars -33,675
30 Smithing icon.png
Steel bar Steel bars 427,125
50 Smithing icon.png
Mithril bar Mithril bars 394,125
70 Smithing icon.png
Adamantite bar Adamantite bars 721,525
85 Smithing icon.png
Runite bar Runite bars 977,125

Collecting raw materials

Raw materials can be obtained in two ways:

  1. A player can have ore in their bank, and use the bank chest conveniently located in the Blast Furnace itself.
  2. Buy ore from Ordan who runs the Ore Seller shop (up to mithril). Ordan usually sells ore for cheaper than street price while his stock is 50 or above, so many players choose to supplement their supply of banked ores by buying ore from Ordan when his stock is high. Therefore, on a busy world, Ordan's stock will often be at less than the max of 100 (which is especially true with coal).

Operating the Blast Furnace

Blast Furnace plan

The process for operating the Blast Furnace is as follows:

Note: Most of these tasks are done for you by the dwarves running the blast furnace on the Blast furnace home worlds: 352, 355, 358, 386 and 387. For this service, it costs 72k coins per hr, but is highly recommended for speed of training.

  1. Place coal and/or ore on the Conveyor Belt.
  2. Cool down smelted bars with a bucket of water or just collect the bars with the Ice gloves equipped.
  3. Collect the bars from the bar dispenser.
  4. Repeat.
  • Note: Always keep your coal bag full
  • The max amount of primary ore that may be placed is 56.
  • If for whatever reason you log out while ores are on the Conveyor Belt, those ores will be lost.

Ordan the Ore Seller

Main articles: Ordan and Ore Seller

The Ore Seller, run by Ordan, is one of many of the stores in Keldagrim and can be found downstairs in the Blast Furnace factory in the eastern side of Keldagrim. This shop stocks ore used for Smithing. The shop is restocked by dwarves that regularly enter the room and deliver a number (around 30) of one type of ore to the shop, rather than restocking 1 of every ore periodically. When the shop reaches 100 of a particular ore type the extra are "sent to storage".


Item Number
in stock
sold at
bought at
Copper ore.png Copper ore 100 4 1 95
Tin ore.png Tin ore 100 4 1 95
Iron ore.png Iron ore 100 27 6 173
Mithril ore.png Mithril ore 100 243 64 165
Silver ore.png Silver ore 100 121 30 70
Gold ore.png Gold ore 100 225 60 206
Coal.png Coal 100 109 18 162

Possible methods

Note: There is a maximum of 254 coal and 56 primary ore in the furnace.

High-level ores

All high-level ore, such as (adamantite and runite), must be in the player's bank as they cannot be bought from Ordan. Coal can be bought from Ordan, but the quantities required for high-level ore usually exhaust his stock after only making one inventory of bars. Therefore, it is recommended that players only use Ordan as a supplemental source and have most or all of the required coal in their bank.

An example of mithril-processing using the shop

Ordan sells all types of ore up to mithril, which allows a player to train Smithing without mining ores. The process for smelting mithril bars is as follows:

  1. Purchase mithril and coal from Ordan in the ratio two coal per one mithril.
  2. Make two trips of 27 coal (or one trip if using a coal bag with a loaded inventory).
  3. Operate the Blast Furnace to obtain 27 mithril bars as described thoroughly in the aforementioned single-player strategy.
  4. Smith the bars into items and bank them or bank the bars directly using the Blast Furnace bank chest.
  5. One can repeat this until the shop runs out of ores. The coal supply generally runs out first; hence, players may need to switch to another world or supplement the store coal supply with banked coal.


  • Contrary to popular belief, the temperature of the stove does not affect the chance of a pipe becoming broken.
  • The conveyor belt that moves the ores into the furnace has three separate sections turning independently. However, only the outer two are connected to the pedal mechanism; the inner one turns by itself.
  • In the Q&A on 11 February 2010, Paul Gower stated that the Blast Furnace was created during an attempt to make a Smithing Guild.
  • Originally, the Blast Furnace did not have dwarves working on the machines. They were added due to player complaints of saboteurs breaking the machines constantly.
  • Oddly the Bar Dispenser doesn't work while a dialogue box is open.