Summer, halts at mines hurt coal

Coal supplies in China will continue to be tight and prices will stay high due to suspension of production at mines and tighter import controls since April, analysts said.

"The price of thermal coal has been driven up by rising demand and tight supply," said Zhu Yi, a Hong Kong-based analyst at Bloomberg Intelligence.

"While demand from power plants increases on hot weather and will continue to be high in the peak season of summer, supply has been tight due to production suspension as the government implements stricter environmental checks."