The CS handles bad ground very well. My ground requires most machines to have a DD coil to work well. The CS did very well with the concentric coils. So I wouldn't worry too much about the ground mineralization.
When you set up for your site what you want to do is run the detector as hot as you can and still tell good signals from false signals.
You can start by seeing how high the local electrical interference will let you turn up the sensitivity. Set your threshold to -10 and start raising your sensitivity until your display goes erratic. Then turn it down until the display stabilizes.
Now ground balance. Once you've ground balanced, see how much falsing you get. A false is a non-repeating audio report. Do you get a lot of faint small signal chirps? If the chirps and falsing is so bad that you can't tell the difference between them and good targets, even deep good targets, then you need to start adjusting downward. Start by lowering the Threshold by -5 at a time. If you get to -35 and you don't really see a difference, then return to a -10 setting and decrease you sensitivity by one and start over. You do this until you get to a point where the falsing doesn't interfere with recognizing the good signals.
Turning Tracking on will eliminate the tiny chirps from ground minerals if you find that they bother you too much.
I hunting one area where I had to run the sensitivity at 0 and threshold at a -25 to kill the electrical interference and I was still picking up 5 and 6" deep targets with no problems so don't freak out if you have to turn the sensitivity down low in some places. Better a lower sensitivity setting and a higher threshold setting.
Hope that helps.
Mike
