Iron mine

The Iron Mine is a building that produces iron. It transports iron to Steel Factories or Cannon Ball Factories.

Tips

 * 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