TUG is about to get a lot more metal. It's about to be so metal that you won't be able to handle all of the metal. At least, you'll need to be skilled with forging to handle all of the metal, as the game's initial implementation for metallurgy is coming to a test client near your desktop. The game has posted an update for backers explaining that the first pass is nearly complete, and the next game update will allow players to build a forge, make simple bronze age tools, and mine for important minerals.
But what's it all worth if you can't show off to your friends? Multiplayer support is currently high on the priority list, with no specific ETA provided beyond a promise of another update in the near future. For more details on the developing features, check out the full update on Kickstarter.