Thanks again for your great insight.
The thought cross my mind this morning when I was metal detecting my back yard.
Normally, I go for my front yard, where there are far more coins. However, I wanted to try something different and hunt the backyard today.
Well, just like the front yard, the upper layer is dark brown/black, with an orange "clay" layer underneath. However, the difference is that I hit the orange clay far sooner in my back yard than my front yard.
Anyways, when using my Garrett Carrot on its max sensitivity, I think it started falsing on the orange clay soil in my back yard. It was most pronounced when I had a very large clump of it...say something the size of a softball or larger. So this got me to thinking that my orange clay soil is very mineralized.
Now that I think about it, I've always noticed that whenever my Garrett Carrot is on its max sensitivity, it "seems" to always say there's a metallic object deeper in the hole I just dug. I always assume it's b/c my front yard is so trashy (which it is). But perhaps it's because the orange clay is setting off the Garrett Carrot?
Assuming my observation is correct, is it fair to assume that a soil that makes a Garrett Carrot false on its max sensitivity is "highly mineralized?"