Earlier quoted context omitted.
One alternative to this is to just create lanes with rope. i.e. you drive a stake in the ground on either side of the field (if that's even possible) and just create a lane where each of these rollers roll through. It won't work in every single landmine, but it can provide a 'grid' within which you know what has been cleared and what has not.
When they're handing out jobs, I sure hope I'm not the one assigned to drive these stakes and run the ropes through the minefields :)
May be harder with heavy / long lines / wind, but come on - we can build hanging bridges over very high canyons without anyone levitating to the other side first ;)