# Mine & Steelworks

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Whenever we build or expand a Mine or Smelter, we can choose which resource we want to produce.

For a Mine, the options are:

* Iron Ore,
* Copper Ore,
* Uranium Ore.

For a Steelworks, the options are:

* Steel,
* Copper,
* Uranium.

It's important to remember that each subsequent level of expansion is more expensive - as is the case with all buildings. Therefore, we should first build a mine for the resource we are most interested in.

Example If we have already expanded the Smelter to produce Steel and Copper, then each of these departments will have separate upgrades to develop, allowing you to produce both Steel and Copper in the same turn.
