|1889||The Mitsui-gumi purchased government-owned Miike Coal Mine from Ministry of Finance.|
|1911||Mining department of Mitsui Unlimited Partnership became independent and established as Mitsui Mining Co., Ltd.|
half of 1950
|Along with progress in the energy revolution, diversification is promoted. (Advanced coke, cement, *and machine businesses.)
*Withdrawn from the cement business in March 2004.
|1988||Discontinued one coke furnace.|
|1993||Mitsui Miike Chemical Engineering Machinery, Co., Ltd., was merged. The engineering department was strengthened.|
|1997||Withdrawn from the domestic coal mining business.|
|2006||Completed construction for the re-starting of the stopped coke furnace.|
|October 2008||Became an equity method affiliated company of Nippon Steel Corporation and Sumitomo Corporation.
(The equity rate of both companies was 21.7%.)
|April 2009||The business title was changed from Mitsui Mining Co., Ltd., to Nippon Coke & Enginieering Company.|
Kattachi pit, about 1898
1A coke oven re-started in 2006