Aso Mining Company

Aso Mining (麻生鉱業) was the core enterprise of the Aso Group, tracing its origins to 1872 when Aso Takichi, a former village headman, began coal mining in Kama District, Fukuoka Prefecture. Takichi acquired concessions across the Chikuho coalfield and branched into banking, electricity and railways, making the Aso family one of the regional Chikuho zaibatsu alongside the Kaijima and Yasukawa families. The business was incorporated as Aso Shoten (麻生商店) in 1918 and renamed Aso Mining (麻生鉱業株式会社) in 1941; it ranked among Japan's eighteen major coal companies.

It operated multiple mines around Iizuka and Kama in the Chikuho coalfield, Japan's largest coal-producing area, including the Yoshikuma, Tsunawaki and Akasaka pits. Chikuho coal fed the Yawata Steel Works and the Kitakyushu industrial zone and was treated as a vital wartime energy source. Conditions were harsh under the traditional naya (納屋) boarding-house system; a gas explosion at Yoshikuma on January 25, 1936 killed 29 miners.

After the government began organised labour mobilisation from Korea in 1939, Aso mines relied heavily on Korean workers. Estimates differ: researchers put the total at roughly 10,000–16,000 between 1939 and 1945, while wartime statistics cited in Japanese sources record 7,996 Korean workers up to 1944, of whom 4,919 had fled. From May to August 1945 a POW camp at the Yoshikuma mine held 300 Allied prisoners (British, Dutch and Australian), two of whom died. The Japanese government released documents confirming the POW labour in late 2008; the issue drew international attention because Aso Taro, a member of the family, had served as Foreign Minister and was then Prime Minister.

As coal declined after the war, Aso Mining merged with Sangyo Cement Railway in 1954 to form Aso Sangyo, dismissed its remaining miners and ended coal mining in 1966, and was dissolved in 1969. The cement division, spun off as Aso Cement, became the core of the present Aso Group. Buildings associated with the family in Iizuka and mine remains across Chikuho preserve this industrial and labour history.