[Rudy]

Originally Posted by hung

If I have already detected a piece of copper the size of a coin from 30m, why can't Morgan do the same with a gold coin from this distance or even greater?

It depends on how long it was buried and specially if the right conditions of weather, ionic field intensity, etc. are met.

If you support the theory of 'It did not work for me so it does not work', fine.
Just don't make any assumptions I think the same as you.

A more likely explanation is that Hung physics apply only in the vicinity of Hung.