MinigamesOSRS Blast Furnace Guide 2026: Up to 2M GP/HR and the Fastest Route to 99 Smithing
Complete OSRS Blast Furnace guide 2026. Best bars for profit and XP, exact GP per hour for every method, how to get there, coal bag setup, and inventory tips that maximise every run.
At a Glance
| Stat | Detail |
|---|---|
| Location | Keldagrim - start Giant Dwarf quest to enter |
| Min. Smithing | 15 (with Foreman payment) |
| Recommended Level | 60+ for profitable bars |
| Best Worlds | 358, 386, 387 (official BF worlds) |
| GP per Hour | 200,000-2,000,000 depending on bar type |
| XP per Hour | Up to 1,400,000 (adamantite) |
| Essential Items | Coal bag Ice gloves Stamina potions |
What Is the Blast Furnace?
The Blast Furnace is a Smithing minigame in Keldagrim that halves the coal requirement for every bar type. Steel normally requires 2 coal per iron ore - at the Blast Furnace it takes 1. Runite normally requires 8 coal - here it takes 4. This coal saving translates directly into profit, making it the best Smithing money-making method and one of the best Smithing XP sources simultaneously.
How to Access the Blast Furnace
- 1Start the Giant Dwarf quest - you don't need to complete it, just begin it to enter Keldagrim
- 2Travel to Keldagrim: Minecart from Ice Mountain south-west of the Grand Exchange, or Grouping Interface -> Minigame Teleport
- 3Head south of the city to the Blast Furnace
- 4Switch to World 358, 386, or 387 - official worlds with stocked coalmen who handle coal automatically
- 5Pay the Foreman 2,500 GP every 10 minutes to use the furnace (required below level 60 Smithing)
Essential Equipment
| Item | Where to Get | Why You Need It |
|---|---|---|
| Coal Bag | 100 Motherload Mine nuggets | Holds 27 extra coal per trip - near-mandatory |
| Ice Gloves | Ice Queen, White Wolf Mountain (50 Mining) | Automatically cools bars - no delay |
| Stamina Potions | Grand Exchange | Sustain run energy per trip |
| Bucket of Water | Anywhere | If you don't have ice gloves (slower) |
The Coal Bag from Motherload Mine is the single biggest efficiency upgrade for Blast Furnace. Get it before starting.
Bar Methods Ranked by Profit
GP numbers change daily with Grand Exchange prices. Always check ore and bar prices before buying bulk ore.
| Bar Type | Smithing Req. | Coal Saved | Est. GP/hr | Est. XP/hr |
|---|---|---|---|---|
| Runite Bars | 85 | 4 per ore | 1.5M-2M | ~200K |
| Adamantite Bars | 70 | 3 per ore | 400K-600K | 1.2M-1.4M |
| Mithril Bars | 50 | 2 per ore | 200K-350K | ~600K |
| Steel Bars | 30 | 1 per ore | 100K-200K | ~900K |
| Gold Bars + Gauntlets | 40 | N/A (no coal) | -300K--500K | ~380K |
Recommended choice by goal:
- Maximum profit: Runite bars (85 Smithing required, highest capital needed)
- Best XP + profit balance: Adamantite bars (70 Smithing)
- Fastest to 99 Smithing (accepting GP loss): Gold bars with goldsmith gauntlets
Optimal Inventory Setup
For steel, mithril, or adamantite:
| Inventory Slot | Item |
|---|---|
| 1 | Coal bag (filled before each trip) |
| 2-27 | Ore (26 pieces) |
| Equipped | Ice gloves |
| Leftover slots | Stamina potion doses + coins for Foreman |
The Loop (Official Worlds)
- 1Fill coal bag at the bank -> deposit coal into the coalman
- 2Load ore onto the conveyor belt
- 3Collect finished bars from the dispenser
- 4Bank and repeat
On official worlds, the coalman manages coal automatically. Each full lap takes approximately 30 seconds at efficient play.
Frequently Asked Questions
What is the best Blast Furnace bar for profit in 2026? Runite bars at up to 2M GP/hour - but require 85 Smithing and significant starting capital. Adamantite is the best profit-to-XP balance. Always verify GE prices before buying bulk.
Do I need to complete a quest? No - just start the Giant Dwarf quest to enter Keldagrim. On official worlds the coalmen handle everything.
What is the Coal Bag? It holds 27 extra coal in one inventory slot - effectively doubling your coal capacity per trip. Costs 100 golden nuggets from Motherload Mine. Essentially required for efficient play.
How long does 70-99 Smithing take at Blast Furnace? At 1.2-1.4 million XP/hour with adamantite bars, approximately 35-40 hours from 70 to 99.
Quick Tips Checklist
- Get the Coal Bag from Motherload Mine before starting - it's mandatory
- Get Ice Gloves from the Ice Queen (free, 50 Mining required)
- Always use an official world (358/386/387) - the coalmen save enormous amounts of time
- Check GE prices before buying bulk ore - margins change daily
- Drink a Stamina Potion dose every lap to maintain run energy
- Pay the Foreman 2,500 GP every 10 minutes or you'll be kicked out
Need GP to fund your first batch of runite ore? Browse Yellow Hat's OSRS gold - instant delivery, escrow-protected. Or check our OSRS accounts with Smithing already trained.
Sources: oldschool.runescape.wiki/w/Blast_furnace OSRS LEGENDS YouTube May 2026 Last updated June 2026