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anyone panned for gold? weight of gold compared to grains of sand?

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. (?)
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nickg5
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nickg5
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Dave BaldwinFixer of ProblemsCommented:
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nickg5Author Commented:
Does anyone know how the weight of a grain of gold, would compare to a grain of sand, the exact same size?
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Dave BaldwinFixer of ProblemsCommented:
About 8.4 times.  http://antoine.frostburg.edu/chem/senese/101/measurement/faq/indiana-jones.shtml

And:
"Impure gold, as it commonly occurs in deposits, has a density of 16 to 18, whereas the associated waste rock (gangue) has a density of about 2.5. The difference in density enables gold to be concentrated by gravity and permits the separation of gold from clay, silt, sand, and gravel by various agitating and collecting devices such as the gold pan, rocker, and sluicebox."

from http://pubs.usgs.gov/gip/prospect1/goldgip.html
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nickg5Author Commented:
thanks
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nickg5Author Commented:
-
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Dave BaldwinFixer of ProblemsCommented:
You're welcome.  Sometimes I read the whole question....
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