The Messiah:

You are funny people: Smog-Smaug, drunk elves. And no one was confused that Turin was quietly sailing in a Iron Car in a stream of melted gold, holding the boat a few centimeters from the surface of this stream?? to

In the melting of gold will float not only an empty iron product, but also the brush of that, since the density of the melting of gold is higher than the density of the solid iron.
Well, for the thermal resistance of the dwarves and their boots, I will not say anything.
Although somewhere encountered a description of how the gnome pulled steel plots from the mountain with his naked hands :)