I have a minelab soverign i purchased from Kellyco a few years ago. Its a great machine, but has a definite learning curve. Lately i have not had much time to go hunting with it. Last year i spent a few hours looking over an old cedar logging site from the 1880's in north idhao.
Found some weird stuff, like tree climbing spikes, a 24" piece of railroad steel buried about 20" deep, and old tin fork and part of a tin plate. Also found 3 old drafthorse shoes.
I saw pictures in the local museum of loggers standing about 6' off the ground standing on these similar spikes to fall the trees. The railroad steel was used as a portable anvil for repairing shoes. Not much of value, but its fun to find 100+ year old stuff.