This week, Xstrata, another big mining firm, suspended operations at a nickel mine in the Dominican Republic while converting its power supply to run on coal, rather than-more expensive-oil.

Four miners were still trapped in a flooded coal mine in Shanxi. The accident occurred Friday afternoon in a coal pit run by the Lingshi coal mine.

Vibration classification screen is the key to ensure the quality of washing raw coal and product raw coal in the process of changing from run-of-mine coal to washing raw coal.