@Joe-Lionheart we have just added the cost in the tooltip. You can check it in the "alternate UI".

This will be included in the next version (with the new graphics)

I LOVE this update!! The game is getteing better and better!

Came to the forums to address this issue specifically. Colow wheel when choosing factions is so useful. Only just noticed this minor inconvenience in the game so far as i have only gotten as far as placing initial mines.. Otherwise seems like a great implementation of the game.