Ah, but if you're presenting yourself as someone looking for something of monetary value then you'll have to split it or will be told no. Much safer approach is to have facts from your research memorized and say that you're relic hunting for bits of history from the old school house that used to stand there or the military training camp or the civil war camp or if its just an old house learn who lived there and something about their family. Just be prepared to discuss the history you've read up on while researching the site. Once they're satisfied that you're saving history not pilfering their savings (money in ground they own) they are almost always more ready to say yes. I get very, very, few no's with this approach. Afterall, you're going to dig a lot of old trash, even if you are just coinshooting. Approach is everything in this game if you want to have good sites to detect. Also, do everything you can do to make friends with these people, listen to their stories, entertain their questions and answer as honestly as you can.