Extracts uranium from uranium ores.
- Keep these the same level as your Nuclear Reactors, they have a 1:1 ratio when the same level.
- Keep these 1 level above your Lightning towers.
- These are a high priority for upgrading. If you ever start a night without full ammo upgrade as soon as possible.
- You only have 3 in a game, so you only need one mine to fully operate.
- Place any new mines when you get them and try to upgrade them all to the same level when possible.
- these should be the second mine you upgrade/place, behind crystal mines.
 original reference