[Tomgs]

You cannot detect that the mines are there until the treaty is broken or another race with no treaty goes into that sector and somehow tells you about it, that could happen with human players but not the computer players. Of course you may wonder why such and such a races ships always dissapear when they try to go through that warp point while you go through with no problems. As long as the treaty is on the mines are invisible I think I may be wrong but I have had other races mine places and I never saw the mines untill they were triggered.