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Before you embark on you journey toward the Blast Furnace itself it's worth noting that it's only available in the following worlds: 352 350, 355, 358 355, 386 and 387. Once you've finished speaking the Giant Dwarf, and then entered Keldagrim, you need to: Head north and make your way over the bridge. Once you've reached the bridge, continue heading south until are able to see your Blast Furnace icon on the map. Inside the designated building go downstairs, and you'll see the furnace.
Once you've completed the process the first time, it will be much easier to travel to the site in the future. It is possible to use your Grand Exchange shortcut on the northwest wall, take to the minecart and explore Ice Mountain the dwarven mines, or utilize the minigame group finder to appear outside the building.
It takes a little getting used to, but the minigame for the Blast furnace is very easy. To operate the furnace, follow these steps: Drop your ore onto the conveyor belt. Begin to run down the ramp with a bucket full of water or gloves that are ice rs 07 gold. Let your bars cool down before you bank them.