Found a 1898 Barber Dime, 1918 Mercury Dime, Naval Uniform Cuff Button, and a Pewter Bracelet.
1898 Barber Dime & Naval Uniform Cuff button (maybe) - It's missing the back part and loop.
1898 Barber Dime and Button Front Views
1898 Barber Dime Back View
1898 Barber Dime in the plug
1898 Barber Dime just out of the plug
1918 Mercury Dime
If look hard near right of center of the plug you can see the edge of the Mercury Dime. It's just above the break in the dirt.
1918 Mercury dime out of the plug
Pewter Bracelet (maybe) - It is a bit bent up, but it looks hand made. It looks like two wires twisted together, maybe hammered flat, and joined together. It still has some areas that look like it was coated in silver or looked silver before it corroded.