Am I the only one to do this!!!!

[PoorOldSpike]

Minefields stay dangerous the whole game,they just keeps on exploding, but as Mad Russian said, the detonation chance seems to get lower and lower after each explosion as if the field is slowly depleting..
In this test I ran a bunch of panzers up and down the dirt road over the buried AT-minefield for 30 turns and they were being blown up at intervals over the whole 30 tns, the minefield exploded 13 times and destroyed or immobd all the 13 tanks in this pic.
PS - Interestingly, when the first tank was blown up, the rest of the column jammed their brakes on and auto-plotted routes around the mines, but when I then cancelled the plots and ordered them to go straight through the mines, they obeyed most of the time even though they were getting blown up..