What's the answer?

[Steve_K]

I mostly hunt local parks and disturbed ground when I can. By disturbed ground I mean a sidewalk or curb restoration. Where I live limestone lies just beneath the surface. It's not unusual to get into rocky soil 2" deep or less. I often get a good signal, maybe 8" deep or so. At 3 or 4" I hit limestone and simply can't dig it to get to the target. Keep in mind I'm digging public property so bringing in an excavator is not an option.

 

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[Terry Soloman]

Public parks always demand a "hand digger," and proper plugs. You may be hearing compressed minerals IN the limestone, as targets. Start by lowering your sensitivity, or gain, (on a 1-10 scale) to 6. Set your discrimination just below Nickel. See how that works for you.