Gold is a simple form of chemical element gold, which is a soft, golden yellow and corrosion-resistant precious metal. Chemical symbol Au (from Latin: Aurum), atomic number 79. Pure gold is a kind of metal with bright luster, reddish yellow, soft texture, high density and ductility. It is a rarer, more precious and more valuable metal. It is not only a special currency for reserve and investment, but also an important material for jewelry industry, electronics industry, modern communication, aerospace industry and other departments.
/kloc-before the 0/9th century, the gold productivity of human society was very low. Some people think that in the thousands of years before19th century, human beings produced less than 10000 tons of gold, for example, only 200 tons in18th century.
Due to the discovery of a series of gold resources in the19th century, the gold output has greatly increased since then, especially in the 50 years in the second half of the19th century, which exceeded the sum of the previous 5,000 years. In 20 13 years, the global total gold output is about 2770 tons.