Detecting coins a mile away

[Clondike Clad]

Ok I want to know how can one pick up a signal from a coin a mile away,
Any information on what signal ,the power of the signal the coin will give off.
What type of pick up system that can detect a coin at a mile.
OK LETS GET TO WORK ON THIS ONE.
We have some smart people on this site.

[Qiaozhi]

Ok I want to know how can one pick up a signal from a coin a mile away,
Any information on what signal ,the power of the signal the coin will give off.
What type of pick up system that can detect a coin at a mile.
OK LETS GET TO WORK ON THIS ONE.
We have some smart people on this site.

If you need help picturing the impossibility of this task, then simply walk a mile away from your home and bury one single coin. Then walk back and think seriously about how you would detect this coin from that distance.

[robert]

...


Very easy; engage hung with his device, and you can easily detect coin at 1 mile distance....!? Oooops! I mean 1mm distance! Sorry!