The Kaechon Coal-mining Machine Factory under the Kaechon Area Coal Mining Complex has set up a production process for drill parts and settled technical problems arising in its operation. The Kaechon Coal Mine established a process using lost foam casting technology and produces various kinds of gears and parts.

The Inpho Youth Coal Mine of the Pukchang Area Youth Coal Mining Complex invented and made various jigs and equipment and manufactures a loader to increase the efficiency of mining.

The Ryongdung Coal Mine of the Kujang Area Coal Mining Complex introduced advanced mining methods and high-efficiency equipment into all coal faces to raise the extraction and drilling rates.

Introducing technology for raising blasting efficiency and the process for ensuring stability of the tunnel while saving timber, the complex increased coal production and made it possible to make a lot of economic profit.

The Hoeryong Coal-mining Machine Factory of the Kyongwon Area Coal-mining Complex sent loaders made by its own efforts to coal mines.