how to separate the gold dust from rock combined of gold dust and sand?

Answer 1

Most gold ores contain a VERY small amount of gold. You need chemical refining methods to get out and concentrate the gold after the rock is crushed. And, those methods use some pretty toxic chemicals that are dangerous to handle and very polluting when they get into the environment.

This is not a do it yourself kind of project.

If you are interested in finding some gold in the wild, you can go to Alaska and do some gold panning. You won't get rich but if you are persistant and learn how to do it right, you can make enough to pay for your trip and have some fun. There are actually quite a few website and books about this.

Answer 2

You obviously don't watch enough of Tom and Perry Massie. Swirl the two components in a gold pan filled with water. The lighter sand (unless it's black sand) will float out over the edge while the much heavier gold sinks to the bottom. Then use a "snuffer bottle" to vacuum up the gold dust.

Answer 3

Gold dust is separated from auriferous sands by gravity. The auriferous sands are washed with water in a gold pan or sluce. Since the gold particles are much heavier than the sand they settle to the bottom of the pan or sluce. This process is referred to as panning or slucing placer gold. It was used a century ago by placer miners to mine auriferous beach sands.

Answer 4

Use a liquid whose density is higher than sand and lower than gold. Or
http://www.prospectorsparadise.com/html/black_sand.html