· Smelting Ore into Bars: Furnace. The main way you'll be smelting ores into bars in Runescape is with furnaces. Go to a furnace and you'll have an option called "Smelt". When you click to smelt you'll be given another option, that being of what bar you'd like to smelt (bronze, blurite, iron, silver, steel, gold, mithril, adamant, and ...