Mines could add a lot of game depth

[Eisenhans]

Nyx!

I like the idea of incorporating a computer!
It could be a cheap thread of it's own or in Computers.

As for "we already have... why should they lose it": Because it's a game and it would add to it! There's other technology that shouldn't need to be researched first by a technologically advanced civilisation( what makes a ship training facility such a new thing to invent? Or: why do you have to do research first to be able to build some crappy mine?). But that doesn't matter becaause the more needs to be researched the better.