Mineralization level question.

Hi, guys.
My question is about ground mineralization. Is it high mineralized if my CZ-3D get ground balanced at no more than 3.5?
I'm concerned about this because here, in South-Eastern Ontario, I find old coind not deeper than 8". Usually at 6". Deepest was 8-9" canadian LC. No silver dimes deeper 5-6". Is it normal? Just seeing how guys from other regions make finds of old silver up to 10".
Recently aquired Minelab E-Trac. Story pretty the same. 6-7" on copper cent at Auto +3.

Best 'real-time' way to tell is to bury a dime at 7"........... then 8"............ then 9".................. testing/verifying ID as you proceed. Chances are/// I speculate that the dime will ID as 'iron' at around 7" or 8" depths ................... although you may be able to detect the dime to 10" - 11" ; yet, will still ID as 'iron'.

Quote from Tom D - 'The 'tightness' of the ground balance 'window'........ is what tells you how bad the mineralization truly is.

In other words, if you can only move the GB knob very slightly to get equal sound pumping the coil (ground balanced), that's a tight window and high mineralization. Opposite is true for low mineralization.

Ozzie hit the nail on the head with his post..Many years ago a Fisher tech explained this to me..In other words the number a CZ ground balances on means nothing but the tightness of the ground balance window or vice versa is where its at.. The number it ground balances on many units and some even have a procedure to tell you the actual number but not so on a CZ. Over the years many have experimented with positive and negative ground balance but I always set it spot on and got them as deep as anyone..

> In other words, if you can only move the GB knob very slightly to get equal sound pumping the coil (ground balanced), that's a tight window and high
> mineralization.

It is exact situation out here. The window is tight. Now I understand. Thanks!

YuriyV, you're welcome. I learned that tidbit on this forum, just passing it on..

Thanks Dan for expanding on that.