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History
| 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. |
| the latter 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 *Withdrawn from the cement business in March 2004.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| 1997 | Withdrawn from the domestic coal mining business.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