The Rangrim Area Youth Coal-mining Complex has secured reserve cutting faces through the high-speed tunnelling campaign and introduced advanced coal-mining methods to cut more coal. The Hangggu Youth Coal Mine has carried out its daily coal production plans more than 1.5 times by conducting a mass movement and doing good deeds for the next shift. The Rinsan Youth Coal Mine and the Inpho Youth Coal Mine are improving the conditions of cutting faces and increasing the productiv