Any recommended settings for the F70 in Gold country, Northern California?

[vincentvangerven@gmail.com]

Have obtained a fisher f70 and it's stable when air testing, but when I put the coil to the ground in my heavily mineralized soil it's going haywire, very chatty.

Any users of this machine in my area who have some recommendations?

Another thing that I noticed is that with just about any setting I tried it will identify a small balled up gold necklace as iron, with a iron tone and number 7 on the screen.

I know small gold typically scores lower on the chart but i was a bit surprised since the detector was once marketed to even be usable for gold prospecting

Thanks