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If you notice any errors, feel free to correct them.
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 
Gold 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)- Gold Vein Upgrade to build minecart tracks to the
Goldmine 
Stone Vein Upgrades to build minecart tracks to the 
Quarry
Units
Summonable units require ingots to be upgraded.
Source
Depletable
