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As you know gold has one isotope. On the other hand due to its very special characteristics it has very small molecules ~ it is a regular practice to make 2 molecule thick gold films on satellites to protect them from cosmic rays ~

Turns out GOLD FLOUR can be so fine that gold will literally float on water. The Vanderwall forces are so strong at a certain small size that the gold is unable to break through the surface tension of the water at its interface with the atmosphere.

Well, I've seen the gold leaf they use for painting and it is far thinner than aluminum foil. You can make things that aren't supposed to float on water float by gently setting them in the water. This won't work with an anvil.

Now, back to GOLD FLOUR, this stuff was extracted way back when in Egypt and Arabia, and possibly Anatolia through the use of fresh, greasy animal hides or a substance like paper pulp. Once you've found a site showing a trace all you need to do is divert the surface of the water to a device that knocks the gold to the bottom ~ come back in 10 years and you have a bunch of it that's almost invisible.

Why would it be invisible? I would think if you have enough of it, you would see it. Spill a tiny amount of flour on a counter and you can barely see it but pour the whole bag out and you can easily see it.

Why is it only on the East coast? I'm less than 30 minutes from Sutter's mill and they discovered plenty of gold there.

GOLD FLOUR can be seen as a sort of a sheen ~ which is how you find it. I was referring to extraction methods like panning ~ it just doesn't "show" and you have this Vanderwaals forces problem where they are very strong given the small size of the particles. They do not naturally clump! That keeps them spread apart ~ and difficult to detect, even though there may be gazillions of particles.

Obviously once you get it clumped and in one flask you are going to see it.