Gold can be found in ordinary river sand. Generally speaking, rivers and sand contain gold. As a precious metal, gold has good physical properties. Real gold is not afraid of fire, that is to say, it is not easy to melt under the general flame. High density, heavy hand feeling, good toughness and ductility, and good conductivity. Pure gold is bright yellow, but its color changes greatly when mixed with other metals. For example, gold-copper alloy is dark red, and silver-containing alloy is pale yellow or grayish white, and gold is easily ground into powder.

River sand refining method

Compared with gold flotation, cyanide leaching and other mineral processing methods of rock gold ore, the method of extracting gold from placer gold ore is much simpler. That's gravity separation. Commonly used gravity separation equipment includes spiral chute, sawtooth wave jig, shaking table and so on. Many placer gold mines contain cemented clods, some of which are larger than100 mm. If these clods are not broken, they will be discharged together with waste rocks in the screening process, resulting in gold loss. In addition, vibrating screen and roller screen are often used as screening equipment, with long service life and large handling capacity.