Can thermal or em mines sensors be used on mines? I just ran a test and it seemed that the thermal and EM payloads jumped out of the mines by themself, possibly triggered by the thermal emissions of the other mines and the EM of the active mines also being tested in the same area. However neither of the payloads actually hit anything, despite the mine droppers only travelling at 7,000 km/s while the payloads had a speed of 29,000 km/s.
The active mines however performed admirably, Each of 2 size 20 mines dropping 3 size 6 missiles at the 4000 ton target ship from 200,000km range, 4 payloads connecting successfully and doing significant damage with it's 10 strength warhead.

That's why you would stagger the minefield somewhat, if placed 150k apart and equipped with 30k speed missiles each salvo should be be an increment apart and able to retarget once primary target is destroyed.

If a fleet of ships encounter the Mine would all the submunitions target the same ship in the fleet?  Or would each target a random ship?

I know I've mentioned this before...

One caveat with mines is if you drop 100 mines on a JP, and all 100 detect a ship... All 100 fire. So you will get a smegton of overkill. Once.

Design a compact missile with an active sensor.  This sensor's range and resolution determines what you can hit, so the missile's fuel reserves only need to allow it to travel that far.

Now, design a mine.  This is a missile with no engine, no warhead, and no fuel, but the exact same active sensor as the missile you just built.  Then add, as a "second stage", the missile you previously built.  Add 3 or 4 of them, if you want.

The mine's sensor will trigger the smaller missiles to fire, so you obviously don't want a different sensor, or the mine might trigger on something the smaller missiles can't detect, or vice versa.

Can someone confirm or deny the bit in parenthesis, please? I am really interested in the answer for role play reasons.