Do you have before and after photos of the nuggets? I am assuming nuggets don't always look like pretty yellow wedding rings gold when found?
How do you get the crud off? How do you even know its a nugget and not just a hotrock or piece of magnetite, which can be quite heavy too?
I have a 5 pound hunk of magnetite I got in a wash below an old gold lode mine sw of Payson years ago. It was solid black but stuck to a magnet.
We don't have nugget ground in the Midwest USA that I know of yet. Sure do envy you guys in Az, Ca, Nevada at times..