[Aussie Gamer]

I believe that the only way to do this is to have a special device that go onto mines only that can cloak.
As all scanners scan for all cloaking ships as well.
Maybe a small cloaking component that is developed by having small weapons 2 mines 1 you are able to research mine cloaking, which gives you level 1 mine cloak.

It seems to be a bit unfair that level one mines you get effectively level 5 cloaking. The early mines in our history were very crude devices, and as we got better at finding them they got better at hiding them.

Scanners V Cloaking war....