Perspective of comprehensive exploitation of the valuable elements of Chinese coal

Coals throughout the world contain many valuable elements. However, they have not been exploited until now because many people don't realise that: (a) these elements can sometimes occur at such high concentrations in coals, and (b) hence these metals have such high potential economic value. Some metal elements in Chinese coals (or coal ashes) have reached the minimum economic grade and may have huge economic values. Two comprehensive plants for the exploitation of these valuable elements have now been built in China. However, in order to utilise these valuable metal elements in Chinese coal ashes, some urgent problems should be resolved. This comprehensive exploitation may provide guidance for similar coal mines in other countries.