hah I havent messed around with any of that yet..... do a little prospecting every now and then and the problem always arises.....how to get micron/flour gold out black sands....and of course the invisible gold you cant see. Mercury I guess is looked down upon in the prospecting community(for good reason), but highly effective IMO will pick up everything right down to individual atoms of gold far to small to see. Its a simple one step deal, only need the one chemicle and a "retort"(and you can reuse the mercury over and over again). Other methods might be better I just havent really researched much casue I'm happy with just gettin the gold that I can see in my pan, altho it shure would be nice to know I'm gettin it all and not throwing gold back into the creek.
Think I read somewere in certian instances there could be more "unseen" gold in you pan the visible gold. Alot of people would like a +50% return on there gold panning efforts....wouldent you. Could add up big time come the end of the season?!?!?