Well, I finally got a break in the weather and went out today. Didn't find anything interesting, but did find quite a bit of clad. There were a few hits that were a little confusing. Sweeping in one direction, they would show up as quarters, and 90 degrees to that, they showed up as zinc pennies. (very consistently, that is.) They showed between 6 and 8 inches. I dug, and dug, and dug some more... never could find the source. I am using a BH quickdraw II. Any suggestions on what might have been there? I did this in all metal mode as well as disc mode, with the same results.
What i'm wondering is if your hitting on melted aluminum. Are there any BBQ or fire pits around?