Just a quick guide to help out players who are new to the Blast Furnace. I'm aware the guide is missing Iron/Silver/Gold bars at the moment, I will add them in once it's been patched. Feel free to leave a comment below if you have any suggestions on how this guide can be improved! Much appreciated.
How do I get to the Blast Furnace?
Teleport Wizard -> Minigame teleports -> Blast Furnace (last option)
How do I use the Blast Furnace?
[1] Pay the Coffer
Pay the Coffer by speaking to Ordan. 1 hour costs 480K GP, you can pay this fee every hour or pay him for many hours at once. The Blast Furnace timer will activate when you are at the Blast Furnace and will stop ticking if you leave.
Please read it properly otherwise you'll end up like @
The timer will only toggle when you're at the Blast Furnace. If you're elsewhere the timer will not tick down.
[2] Place Ores on the Conveyor Belt
Simply click on the Conveyor belt and it will automatically remove all the ore from your inventory and feed it into the Melting pot.
The Melting pot can only hold 200 ore at once, if you reach the 200 quota you will be unable to use the Blast Furnace and will have to relog to reset it resulting in a net loss of 200 ore.
The table below shows the amount of ores you can use for each bar type within the 200 max mark. This should help with runs, e.g. 2 inventories of Mithril Ore and then 5 inventories of coal for 66 Mithril bars.
Required levels to smelt the bars listed in the table above can be found in the spoiler below.
[3] Check Bar Dispenser
To take bars from the Dispenser you need Ice Gloves which you can purchase from the Loyalty Store for 50K points.
If you can't afford the gloves you'll have to use a Bucket of water to cool down the Dispenser before you can claim your bars. You can purchase empty buckets from Ordan and fill them using the Sink just West of the bank chest at Blast Furnace.
There is no limit for how many bars can be stored within the bar dispenser.
NOTE: If you log out or teleport away from Blast Furnace while having bars/ore in the Dispenser you will LOSE them.
Without Coal Bag
Steel bars = 2 inventories of Iron ore (2 trips) -> 2 inventories of Coal (2 trips)
Mithril bars = 1 inventory of Mithril ore (1 trip) -> 2 inventories of Coal (2 trips)
Adamant bars = 2 inventories of Adamant ore (2 trips) -> 6 inventories of Coal (6 trips)
Runite bars = 1 inventory of Runite ore (1 trip) -> 4 inventories of Coal (4 trips)
With Coal bag
Steel bars = 2 inventories of Iron ore (2 trips) -> 2 inventories of Coal (1 trip)
Mithril bars = 1 inventory of Mithril ore (1 trip) -> 2 inventories of Coal (1 trip)
Adamant bars = 2 inventories of Adamant ore (2 trips) -> 6 inventories of Coal (3 trips)
Runite bars = 1 inventory of Runite ore (1 trip) -> 4 inventories of Coal (2 trips)
If you're still confused watch the video below. I'll go through an entire run making Making Mithril bars as an example.
Route: Mithril bars = 1 inventory of Mithril ore (1 trip) -> 2 inventories of Coal (1 trip)