The question I had, and likely you have too, is when an old channel is cut, how far does the placer gold in the cut channel move down in a river or creek that continues to erode deeper and deeper?

The red dot on the diagram points out where the gravels there were also carrying, but not as much color. The gold was sparse below the point indicated.

George was considering filling his dredge floats with closed-cell foam, ensuring that there would be no area available within each float for flooding.