At present, more than 50,000 tons of gold have been mined, almost half of which is deposited in banks, and the value of gold deposited in banks exceeds 65,438+0,065,438+00 gold rubles. The technological revolution has increased the output of gold year by year, which can not only mine rich ore with high gold content, but also mine poor ore with low gold content.

At first, the method of gold panning was a simple manual method, which was washed with a spoon and a pot. Later, it was changed to "American trough", which became popular all over the world after gold exploration in California.

Later, he switched to hydraulic gold mining, that is, washing with strong water column, and then dissolving tiny metals in cyanide solution; Finally, the method of extracting gold from very hard rocks is studied, and this perfect method is used in large concentrator to extract gold from rocks.