As for "use something like this", where "this" is any kind of technology that tries to detonate mines by force/and or grab up in bulk. You need to be very, very certain that you get all mines. Would you let your child play in the section woods with "hardly any mines" in it?

The issue with forcefully exploding mines is that a certain number might be defective, and/or unstable. Maybe the trigger doesn't work well enough - but maybe it can still go off - perhaps the main charge becomes unstable on its own etc.

There's a reason anti-personnel mines and cluster munitions are illegal (well, in/by civilized countries, anyway) - it's really, really hard to de-mine/clear up this stuff.

Interesting video.