Low signals from rocks?

[Rob66]

Was playing around in the mountains and fairly close to a river.I noticed some white rocks with some black speckles on them gave off a small low signal from my minelab each time I pass over them.just wondering what it might be.I will take some pictures next time.

RD

 

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[Sandman]

You needent bother with the pictures, we've seen them rocks before. They come in different colors but all have some minerals in them to set off detectors. They are called, "Hot Rocks."

 

[Rob66]

Thanks sandman! I knew you would know.