The value of the tailings Such as guangxi nandan tin polymetallic has 61 tailings, in total 25.22 million tons of tailings, contains a lot of non-ferrous metal tin, antimony, lead, zinc, silver, gold, indium, cadmium and arsenic, sulfur and other non-metallic mineral, grade is above the national industrial grade indexes, some already achieved large or…

Mining is one of the oldest activities of man. It is the se- load the blasted rock and transport it to special, steeply lective extraction of ore from the Earth’s surface. Man’s  inclined ore paths. The ore is then loaded into special mining activities began at the start of the Stone Age  buckets and hoisted…