If I drop a mine and it stays in play until someone passes over it and I have munitions failsafe. .. How does that work? And if I combine that with extra munitions I could have the table full of mines before any are triggered.

Mines are not secondary weapons, so Munitions Failsafe does not interact with them (secondary weapons have the "Action:" header).

cluster mines have the action header.. so does conner net..and proximity mines..

Mines are not secondary weapons, so Munitions Failsafe does not interact with them (secondary weapons have the "Action:" header).

You mean the Attack: header.

Okay, Attack header makes sense .. Thanks

If I drop a mine and it stays in play until someone passes over it and I have munitions failsafe. .. How does that work? And if I combine that with extra munitions I could have the table full of mines before any are triggered.

It doesn't.

You've seen how MF only works on secondary weapons which are upgrades with an Attack header which is something all bomb slot items currently lack. With regards to laying Mines all around the board I'd simply add that once you've deployed it you really have no control over it. Say you and your opponent both drop mines that overlap and then a ship, it doesn't matter whose, hits the overlapped section can you really say whose mine is going off first? Ok, I guess the answer is technically yes as the player with initiative would resolve his effect first but mines are so indiscriminate that once dropped they practically belong to no one so why should anyone have a chance to get it back with MF?

If I drop a mine and it stays in play until someone passes over it and I have munitions failsafe. .. How does that work? And if I combine that with extra munitions I could have the table full of mines before any are triggered.

It doesn't.

You've seen how MF only works on secondary weapons which are upgrades with an Attack header which is something all bomb slot items currently lack. With regards to laying Mines all around the board I'd simply add that once you've deployed it you really have no control over it. Say you and your opponent both drop mines that overlap and then a ship, it doesn't matter whose, hits the overlapped section can you really say whose mine is going off first? Ok, I guess the answer is technically yes as the player with initiative would resolve his effect first but mines are so indiscriminate that once dropped they practically belong to no one so why should anyone have a chance to get it back with MF?

It doesn't matter whose mine goes off first as the mine owner is not rolling for the mine effect, the owner of the ship that overlapped it is. It would trigger the applicable effects from both mines if it hit the overlapped section. If the ship was destroyed by the first mine, the second mine has still been overlapped and would also apply its effects and both mine templates would be removed.