Pingtingshan Colliery in central Honan Province has a new pair of vertical shafts in operation with a capacity of 1.2 million tons a year. Designed by Chinese technicians and equipped by Chinese...
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Pingtingshan Colliery in central Honan Province has a new pair of vertical shafts in operation with a capacity of 1.2 million tons a year. Designed by Chinese technicians and equipped by Chinese...