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Ingot
From Super Fantasy Kingdom Official Wiki
Ingot is a Resource in Super Fantasy Kingdom used to acquire and upgrade Buildings and Units.
Crafting
Ingots can be crafted by using 
Ore in the 
Smelter when a Worker is assigned.
Building
The following Buildings need Ingots to be built.
Elemental Tower- Develop
Gold Vein so workers can mine Ore there
Upgrading
Ingots can be used to upgrade the following Buildings
Castle upgrade storage capacity to Tier 3 (32 Resources)
Units
Units require Ingots to upgrade unless they are Human.
Source
Depletable
