What are the hazards of gold mining and smelting and their solutions?

The chemical properties of gold are so stable that it is difficult for other substances to react with it. So it basically exists in the form of simple substance in nature. The mining and production of gold ore is different from ordinary copper-iron ore, and only gold sand needs to be separated without smelting, so most of them adopt water washing method. Therefore, relatively speaking, gold mining is the most "environmental protection", and there is no such direct by-product as smoke and dust. Of course, those heavy machinery rumbling by the water will consume a lot of energy when working, and will also produce secondary pollutants; In addition, gold mining will definitely change the ecological environment, but the direct "pollution" is still very small. It will not cause direct "harm to the health and intelligence of pregnant women, babies and children".