H'mm! If i had a test garden which i don't, i'd definitely bury more coins a little deeper too. 10, 12 and 14 inches then experiment.
Keep in mind though, a freshly buried coin at 12 inches would likely detect differently than a 12 inch deep coin buried for a 100 years.
Trust me, the IDs might be way off of the expected for a coin, but with experience, the right coil and the right settings the eTRAC can, in-fact did find me a bunch of 11 to 14 inch deep barber dimes, mercs, Indians and an old early 1900s car brass key fob last year. And in an old park area frequented by detectorists.
Yeah, at first i did get a little on the paranoid side digging foot+ deep holes in that park. But seeing, flagging down then BSing with the old park caretaker eased it all.
In fact, he also gave me some pointers on where to find the oldies and it paid off. My experience is that most park mowers' especially, like to break the monotony of mowing by BSing with someone.
I got to know another park attendant at another park. I somehow lost my trusty Garrett probe there. A few weeks later, i returned to that park and the caretaker flagged me down. Yep, he found my probe and kept it for me.
And yet with another old late 1800s park i frequent, i got to know the park manager to the point we both compare historical research on that park. That combined research paid off too.
Every time i'm at a new park and see a caretaker or someone mowing, i always try to strike up a conversation with them.
Moral of the story i guess, it pays to be friendly with park care takers -OR- the best defense is an offense!
