Smelting is the act of processing ores. Unlike most crafting, Smelting needs to be done in a smelter.
Player standing next to a smelter.
Players can also craft Empty bottles that are used in Alchemy using 10 Gold + 5 Sand.
Some Monsters across Agon drop rare ores upon death. To see which mobs drop which ores, consult this chart created by Ryco Stormeye. Consult the Agon world map to find these locations!