The Iron Mine is a building that produces iron. It transports iron to Steel Factories or Cannon Ball Factories.
- It is best placed near a steel factory or a cannonball factory as it both needs iron to produce.
- Keep it near the range of a defensive building so it will not be destroyed by zombies.
- Upgrading the Iron Mine can increase health and how much iron it produces.
- You only need a few going to supply your base until later in the game.
- You can keep these around 3 levels below your base level before base level 7.
- you will not need the max amount to get as much iron as you need until base level 7.
Characteristics at different levels
 originl reference