Advent homing mines are built b squadrons however once they they set up they become mines and no longer count towards the squad total, the hanger then sees that you have a squadron qued and procides to build another, concevably giving unlimited mines for the price of a hanger.
Hmm so this isn't intended? That makes sense. I wasn't clear how mines were balanced after playing with them for a few hours. They are crazy powerful and my carrier just kept dropping them as I went. Considering how long it took to kill with fighters/bombers, the mines seem like nukes.
Makes a lot more sense that each "squadron" of mines should hold it's que place, rather than cranking out unlimited mines. Was pretty amusing sitting back with carriers and moving the mines right next to the ships, then telling them to activate, POW! BOOM, Starbase destroyed!