in the july, 1930 issue of popular science monthly starting on page 41 is an article that claims gold and other ore deposits can be located with electricity. It seems rather far fetched to me. The title of the artice is "new ways of probing old earth for gold". Some might find it interesting reading.
gold locator
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GKL
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Did a search to see if a copy was online -
https://books.google.com/books?id=sigDAAAAMBAJ&printsec=frontcover&dq=july+1930+popular+science&hl=en&sa=X&ved=0ahUKEwjHv97ru4rhAhVokeAKHdhwCu8Q6AEINjAD#v=onepage&q=july%201930%20popular%20science&f=false
Go to page 41
https://books.google.com/books?id=sigDAAAAMBAJ&printsec=frontcover&dq=july+1930+popular+science&hl=en&sa=X&ved=0ahUKEwjHv97ru4rhAhVokeAKHdhwCu8Q6AEINjAD#v=onepage&q=july%201930%20popular%20science&f=false
Go to page 41
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