GKL
Forum Supporter
Same as AIRFORCEMIKE. Way lower than copper memorials and wheats that have been in the ground awhile. I've had them as low as 19 with junk in the ground. So, if you're on an old site with modern activity and want to find an IHP, then you need to be willing to dig zinc pennies. Depth doesn't matter either. I've dug them with that low 20 number just a couple of inches deep.
Okay, thanks for that extra info !!!!
I know target TIDs can vary some due to different factors so I'll know to realize a 19 or 20 might at times also potentially be an IHP !