Details please
gold24,
The best thing to do is get a gold coin and see if the thing responds. Sounds a little like a dowsing rod of some kind but maybe something different.
Do you have any pictures of this thing?
It there a schematic and parts list? (solenoid could be one of 1000s, amplifier - an integrated circuit, a prebuilt amp, etc., a meter, etc.)
Are there directions to use this? for example do you scan the ground with it, does the rod swivel, crossing lines = usually means some kind of molecular frequency thing that is really a fancy dowsing rod and a person walks round signal generator with dowsing rod in hand looking for dowsing rods to cross).
Intriguing story but not enough detail to let the gurus here help you.
goldfinder
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