In the previous report, I stated that smaller volume materials are more likely to settle due to the Brazil nut effect.
In addition, it is generally believed that placer gold with high specific gravity tends to settle due to gravity.
If you place a gold nugget on sand, it will not sink, but if you shake the gold pan, the gold will sink.
I attempted an experiment to confirm this phenomenon.
Three different substances of the same diameter and different specific gravity (glass balls, stainless steel bearings, and lead balls) were placed in a plastic box and shaken on a shaking table.
Glass balls of smaller specific gravity floated on the surface and a layer of a mixture of stainless steel bearings and lead balls formed on the underside.
Since the three samples had the same diameter and the forces of buoyancy and water resistance were the same, I assumed that only the effect of gravity-related mass was present.
In gold panning in the river, the final stage is a mixture of black sand and fine gold.
I believe this condition is due to the Brazil nut effect and gravity.
Негізгі бет Ғылым және технология Gravity acceleration of placer gold in gold panning
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