Smelter

The smelter is a factory that converts stones into iron bars.

During the game, only one smelter can be built, after which it is no longer available from the menu.

Contracts

 * 10 stones converted into 1 bar in 1 hour for 100 coins
 * 100 stones converted into 10 bars in 6 hours for 1000 coins
 * 500 stones converted into 50 bars in 12 hours for 5000 coins