I has the same idea with sharky years ago but i never take a dog.
I believe that the dog has to be for hunting especially for birds.
The reason i was interesting for, in the beginning was a formula[Au (CN)2]- +e = 2CN- +Au !!!
This formula was the answer in my question to a chemistry friend when i asked him what hapens to gold coin when is in ground (rust of gold !!!).
Later i find that CN mixed in ore few years ago (not 50 years that i was interesting).
From Time to time i hear stories from old mans in my country that pigs, donkeys, and dogs have found many treasures and i believe the reason is not the formula but AGAIN THE HALO EFFECT .
I think that the Bio Sensor with a good sniffing or good sensitivity to electrostatics !!! is better from any other detector, remain the way to do it.
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