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.
- 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
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
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.
Below 60 Smithing
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.
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 |
|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|
- ↑ 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.
- 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.
|15 ||Iron bars||124,365|
|30 ||Steel bars||509,165|
|50 ||Mithril bars||570,165|
|70 ||Adamantite bars||661,965|
|85 ||Runite bars||775,165|
Collecting raw materials
Raw materials can be obtained in two ways:
- A player can have ore in their bank, and use the bank chest conveniently located in the Blast Furnace itself.
- 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
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.
- Place coal and/or ore on the Conveyor Belt.
- Cool down smelted bars with a bucket of water or just collect the bars with the Ice gloves equipped.
- Collect the bars from the bar dispenser.
- 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
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".
| GE |
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
- Purchase mithril and coal from Ordan in the ratio two coal per one mithril.
- Make two trips of 27 coal (or one trip if using a coal bag with a loaded inventory).
- Operate the Blast Furnace to obtain 27 mithril bars as described thoroughly in the aforementioned single-player strategy.
- Smith the bars into items and bank them or bank the bars directly using the Blast Furnace bank chest.
- 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.
Barrows • Blast mine • Brimhaven Agility Arena • Champions' Challenge • Gnome Ball • Gnome Restaurant • Impetuous Impulses • Inferno • Mage Arena • Mage Training Arena • Pyramid Plunder • Ranging Guild Activities • Rat Pits • Rogue Trader • Rogues' Den • Sorceress's Garden • Tai Bwo Wannai Cleanup • Tears of Guthix • Temple Trekking • Tithe Farm • Treasure Trails • TzHaar Fight Cave