My father and I used to pan for gold.
I've got the pans and someone near me, wants me to teach them how to do it.
I know we slowly shook the pans from side to side, letting the water slowly remove the sand over the edge. In the light if a spec or flake of gold (or fool's gold) showed up, you'd see it.
So, how does the weight of a grain of sand, compare to a grain of gold, the "exact" same size?
I guess the gold is heavier and that is why the sand leaves the pan and the gold does not. (?)