North Korea has no coking coal, but has substantial reserves of anthracite in Anju, Aoji (Ŭndŏk), and other areas. Coal production peaked at 43 million tons in 1989 and steadily declined to 18.6 million tons in 1998. Major causes of coal shortages include mine flooding, and outdated mining technology. As coal was used mainly for industry and electricity generation, decrease in coal production caused serious problems in industrial production and electricity generation. Coal production may not necessarily increase significantly until North Korea imports modern mining technology.