I'm into metal detecting myself (have 4 different detectors) but have not come across any sites that I could use the tractor to help dig up. Most of the places I detect at are on other peoples property such as old home sites on the properties that my hunt club's lease, or where friends/neighbors don't mind me digging with a shovel. They might balk if I got a backhoe and started doing some serious digging!! Good thread though, I guess cause it peaks my interest since I share the hobby.