Copper is a typical pro-sulfur element, which mainly forms sulfides in nature and only forms oxides under strong oxidizing conditions and natural copper under reducing conditions. About 250 kinds of copper minerals and copper-bearing minerals have been found on the earth’s crust, mainly sulfides and their similar compounds and copper oxides, natural copper and copper sulfates, carbonates, silicates and other minerals. Among them, there are 16 kinds of minerals that can be used as raw materials for industrial minerals in suitable selection and metallurgy conditions. That is, natural elements: natural copper (containing nearly 100% copper).
