I saw a post the other day about searching old wells and I decided to post a picture of a well at a foundation a hunted last year. The ground around the well looked quite unstable so I decided to not even search within feet of it.
Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca
You were wise in not getting near it. Now get some boddies an tie a line onto yourself and see what you can see down the well with a strong light. Since the picture has a cap on the well the well head pump has been removed and junk may have been tossed into it by the owners of the property. I have a friend that says to remove the cover and check it out. He collects old bottles.