kcm
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That would probably be too slow if incoming water is a concern.

Do an internet search on Sand Scoops. They have a handle and usally a step to drive it down, but it is just a cylinder with holes in the bottom. Large enough for the sand to filter through and small enough for rings, coins, ect to stay. If you put a weight on the front of the barrel to make sure it Digs into the mud, then you can trench deeper and deeper in the same trough. Use water from the river to clean any left over mud to check the screen. You could lift it up onto like 2X4's and then pour the water in and stir the mud, when the mud is gone, do it once more to see if and coins are there on the bottom.
In case you are serious, let me reply by saying that I (and 99% of others on here, I presume) are familiar with sand scoops and it will not work. This is a MASSIVE, deep hole full of watery mud (picture a small, inground swimming pool that's at least 8ft deep) that you sink deep into when you enter. I would explain it in more detail (in fact I did earlier in the thread), but it's pretty self-evident that your idea wouldn't work. Thanks anyway, though.
