I have worked dredges before, a 4" dredge in a small river and need to move the big stuff out of the way to get to the sand and gravel. It is hard work and where I was working was at the base of the Sierra Nevada Mtns and it was cold in the river. I think there plan is also to go out of the river too by blasting the sides with water hoses and dredge what comes off the sides. The vidoe on there site shows several different ways of doing it. To move 50 tons of material would be alot of work but until we see what they are doing we can only guess.
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