Fenwei has selected representative coal mines and enterprises from main coal areas in Shanxi, Shaanxi, Inner Mongolia,  as the dynamic monitoring points of production, sales and inventory. Their prices, production, inventories and profits are tracked on a regular basis to produce dynamic monitor data for the quantitative study of production, sales and inventories of Chinese coal and coke producers.

Mines of the same capacity and ownership will be chosen to substitute those that need undergo bankruptcy regrouping. In this case, subscribers will be informed timely.

There are two versions, covering 66 and 100 coal mines respectively.