You are right it is elemental gold...no matter what I should say sub micron gold... either way there's like 25 tons in every cubic mile of seawater... it is not economically recoverable. When it is that size out of any kind of water....your river water is not richer than ocean water even if going through a gold bearing area like where I live....they can barely register mercury in moving water...therefore you are not talking about what's in the water even. Your only results are from a settling pond....it is so rich that if you were doing actual science it would be tossed from the results!!!!! Problem 1
Therefore you must be trying to recover from guess what sediments!!!Your trying to get someone to capture enough of Something through any of your mentioned systems! Water no because your not going to recover gold from water that way.. so suspended gold something big enough to have water even move it on whatever scale.....in moving brownish river water your greasy whatever is most defiantly catch more crap by weight than gold.....EVER.....in ANY.....RIVER ANYWHERE.....PERIOD...... The science behind that is called..
"Duh"....and I own the mining journal article.....I know it well and that is why I didn't include it because It is irrelavent. Based on the fact that the gold is moving way too fast for the capture area you could feasibly have. Every contrivance imaginable has been tried....most great discoveries are accidents!.....there literally should be a saying something along the lines of......."well boy you can't just put a rag in the river and expect anything but to wash windows"....
Yep that one's pretty good... tonight the part of kranky grandpa was played by .Fog horn Leghorn..... yep I can 5o tally hear it