HOT ROCKS
 

Here's an example of what I've been able to find in the Glossary section of various metal detecting books , as a definition of Hot Rocks.

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HOT ROCK - Any rock containing more non-conductive mineralization than the surrounding matrix to which the detector is ground balanced. Positive or false metallic responses can be heard from these rocks in the motion discriminate mode and a negative or null in audio threshold in the non-motion, all-metal ground balanced mode.
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I would like to have some information on Hot Rocks that goes into the subject more deeply.

Can anyone give me a more complex explanation, or where I can find it ?

Thanks !
ToddB66