The combat map uses a totally different time scale.
And these are very much not like terrestrial mines.
Plus it is all abstracted.
Mines could perhaps be made to work like in SF. You'd probably be happier, and I suspect most people would be happier except when defending with mines
...Ships flying around in combat, getting hit by mines as they launch missiles and blast away with DUCs. Could be quite nifty. Maybe for SE 5 or 6