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GM 1000 echo noise

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Please forgive me, I'm completely green. I ran the GM1000 detector over what appears to be some crystallized rocks that were surrounded by basalt. The detector made a very weird echo sound & would start high & fade away. I've heard the typical siren sound it makes sometimes as if there's an error or too much iron around the target, but this sound is completely different & would only sound off like this in this tone over these crystallized rocks. I've only had this machine for a few weeks & it didn't come with much instruction. I don't really know what to search for as far as the noise its making & why. Can anyone here explain to me what's going on? It's a very distinctive high pitch echo that fades away when going over these rocks. Perhaps a user error?

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