wholesale fashion jewelry charlotte nc How to get the fine crushed gold in the sandy beach and sand?

ami jewelry wholesale 1. The first step is flushed in the water flow in the water flow. The principle of the large proportion of gold grains
2, the second step is to use mercury, because the proportion of gold is larger than mercury, and the gravel's proportion is smaller than the mercury
3, and the gravel The third step is generated with hydrocyanic acid and category, and then restored with lead