Those coal mines have raised their production by two percent in recent three months as compared with the same period of last year.

In the period, the Pukchang Area Coal-mining Complex increased its coal output by 27 percent while the Sunchon Area Youth Coal-mining Complex by 12 percent.

The Tokchon Area Coal-mining Complex produced 1 000 more tons a day.

Besides, Hyongbong, Sochang, Jenam and Namyang coal mines have carried out their daily quota at 110 percent.