Smeltery is a production building where ore from the Mine is processed into ingots. You can build up to three Smelteries, each with only one production slot. It is not possible to increase the number of slots or upgrade a Smeltery. Two Smelteries become available at level 21.
The ingots produced in the Smeltery are used to upgrade factories, airplanes, and truck factories in the Industrial Academy.
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
