Well, there's a lot more to foundries than that. Safety with a liquid that explodes anything moist including people on contact and can start a fire remotely is a big one. Liners and molds are usually disposable too, and you generate several tons of spent material for every ton of product. But yes, heat, reducing agent (usually coal, increasingly hydrogen) and common minerals are the basic things involved.
Then again, nothing about the process is delicate, and you don't have to worry about sanitation or spoilage.