HOT ROCK???

a hot rock is a rock that has such high mineral content or metal flecks that your detector will think it is a good target. Frequently quartz is a big offender because it contains various metals and sometimes even gold and silver flecks. And 'No' I do not dig hot rocks if I can help it.
 

very good explanations have been posted above. Just to say if you are having a lot of problems with them ask here just state the terrain type you are wanting to search as I understand it certain models have the ability to ignore all but the largest hotrocks I hope this helps
 

Just an idea but does it have to do with your area being volcanic? aa
 

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