The National Bureau of Statistics announced the market price change of important production data in the middle of January 2018 in January 24th. Data show that the national coal price has steadily increased in the middle of January. The specific price changes of each kind of coal are as follows: The price of anthracite (No. 2 in the wash) was 1261.7 yuan per ton, up 46.8 yuan per ton from the previous period, and the increase was 3.9%. The price of ordinary mixed coal (4500 cards) is 480 yuan / ton, flat with the previous period. The price of Shanxi big mix (5000 big cards) was 550 yuan / ton, up 0.7 yuan / ton from the previous period, and the increase was 0.1%. Shanxi excellent mix (5500 big card) price is 580 yuan / ton, and is flat with the last period. The price of Datong mixed coal (5800 card) is 615 yuan per ton, and is flat with the last period. Coke coal (1/3 coking coal) price is 1180 yuan / ton, flat with the last period. The above data showed that the price of national coke coal and partially powered coal was stable in mid December, and the price of anthracite continued to rise sharply.