Coal is known as the black gold and the food of industry. It has been one of the main energy sources used by the human world since the 18th century. Although the value of coal has declined significantly since the beginning of the 21st century, it has been an essential source of energy for human production and life for a long time. The supply of coal is also related to the stability of China's industry and all aspects of society. The security of coal supply is also the most important aspect of China's energy security.
