Mine (Civ4)

The Mine is a tile improvement in Civilization IV.
== Strategy ==
A Mine can be built by Workers immediately upon the discovery of Mining. A Mine adds 2 Production to its tile. Mines may be created on all hills, and on flatland tiles that have resources which are unlocked by Mines.
* Gems, Gold, and Silver are always revealed, but are enabled with Mining. Settling a city on these resources will not unlock them until Mining is discovered.
* Copper requires Bronze Working.
* Iron requires Iron Working.
* Coal requires Steam Power.
* Uranium is revealed with Physics and enabled with Fission.
* Aluminum requires Industrialism.
When a Mine is worked, and it is not already on a resource tile, there is a small chance every turn that it will discover a new resource. A civilization must have the tech unlocking a resource to gain it via a discovery.
== See also ==
* Mine in other games