Some modern mines have a programmed self destruct time. An additional safety is an electrical detonator system that is powered by a battery with a limited capacity: once the battery runs out, it can no longer fire the detonator. https://en.wikipedia.org/wiki/GATOR_mine_system
A mine with a discharged battery is not exactly safe, but without the detonator it requires extreme conditions or decades of aging to explode.
Some modern mines have a programmed self destruct time. An additional safety is an electrical detonator system that is powered by a battery with a limited capacity: once the battery runs out, it can no longer fire the detonator. https://en.wikipedia.org/wiki/GATOR_mine_system
A mine with a discharged battery is not exactly safe, but without the detonator it requires extreme conditions or decades of aging to explode.