Nokta FoRs Gold, a Gold Cube, 2 Keene Sluices and Lord only knows how many pans....not to mention a load of other gear my wife still doesn't know about!
Here's what I see so far .
the item was bolted down and had a shaft going through the slot on the side in which the end a shaft rode on the wheels .
like today's pillow block bearing would work.
the lid is decorative and meant to be seen .
Thanks everyone for your replies. I think DCMatt nailed it! I looked at other examples online and it sure looks like a match. It makes a lot of sense, I've found 7 axeheads at the site and various other tools that would have required sharpening. Treasurenet comes through again. Now if I could only find the grindstone..but probably a bit heavy for my backpack. Here's a pic of the bottom.