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Yes, if you scale down the antenna/coil (and the aerial vehicle). https://www.smithsonianmag.com/innovation/a-ukrainian-teenag...

this particular rig is too lo-res for that. you need a different detector setup, and slower closer flight.

I wonder if drones could be used for this then?

A spinout from my university, UMag Solutions is detecting UXO and mines in Ukraine using special drone-mounted magnetometers.

They can and they are.

For instance:

We have the little version of this sensor. It's quite interesting.