You can obtain ingots in the following ways:

• In the Smeltery, you can smelt ingots from the ore mined in the Mine. You can build up to three Smelteries. Each Smeltery has only one production slot and cannot be upgraded.

What ingots can be crafted?

• • Iron ingot — from iron ore
  • Bronze ingot — from copper ore
  • Silver ingot — from silver ore
  • Gold ingot — from gold ore

Additionally, ingots can be obtained:

• By sending fully loaded trains.
• In treasure rooms of the Mine or through special promotions.