| 1857-11-30 |
The founding of the modern steel industry in Kamaishi began on December 1, 1857, when Takatoshi Oshima of the Nanbu Domain succeeded in smelting iron ore using Japan's first Western-style blast furnace. |
| 1899-12 |
The founding of the steelworks branch office in Nise Village, Kaho District, Fukuoka Prefecture. |
| 1899-12-09 |
The company was founded on December 9, 1899. To procure coke raw materials and general fuels, a steelworks branch office was established in Nise Village, Kaho District, Fukuoka Prefecture (now Iizuka City). |
| 1934 |
In 1934, Nippon Steel Corporation (now Nippon Steel Corporation) was established through the contribution of five private steel companies centered around the Government-operated Yawata Steel Works, inheriting the Nise Mine (renamed from the Nise Branch Office). |
| 1934-01 |
Nippon Steel Corporation (now Nippon Steel Corporation) was established through the contribution of five private steel companies centered around the government-operated Yawata Steel Works, inheriting the Nise Mine (renamed from the Nise Branch Office). |
| 1939-05 |
The company was established to develop and secure raw materials such as coal, iron ore, and limestone, inheriting mines including Nise Mine, Kamaishi Mine, Kutchan Mine, and Akatani Mine, with a capital of 50 million yen. |
| 1939-05-20 |
Founded on May 20, 1939, forty years after its establishment, the company was created as an independent entity of Nippon Steel's mining division to develop and secure raw materials such as coal, iron ore, and limestone. Initially, it inherited mines domestically and abroad, including Nise Mine (Fukuoka Prefecture), Kamaishi Mine (Iwate Prefecture), Kutchan Mine (Hokkaido), and Akatani Mine (Niigata Prefecture), expanding its operations. |
| 1939-05-20 |
Founded on May 20, 1939, forty years after its inception, the company was established as an independent entity of Nippon Steel's mining division to develop and secure raw materials such as coal, iron ore, and limestone, inheriting mines including Nise Mine, Kamaishi Mine, Kutchan Mine, and Akatani Mine. |
| 1943-02 |
The To-kashiwagoe Quarry was opened in April 1951 (renamed To-kashiwagoe Mine). |
| 1950-08 |
The Ikuwa Quarry was opened in April 1951 (renamed Ikuwa Mine). |
| 1950-10 |
The Tsukumi Quarry was opened in April 1951 (renamed Tsukumi Mine, now Oita Works). |
| 1950-12 |
The Funao Quarry was opened in April 1951 (renamed Funao Mine, now Funao Mine Co., Ltd.). |
| 1951-10 |
The Hanatsuru Mine (renamed Katsuragi Mine in April 1953, now Tochigi Works) was opened. |
| 1951-11 |
Participated in the management of Kanto Securities Co., Ltd. (merged with Dojima Securities Co., Ltd. to form Dojima Kanto Securities Co., Ltd. in July 1998, and sold all shares in June 2008, withdrawing from the securities business). |
| 1954-03 |
Listed on the First Section of the Tokyo Stock Exchange. |
| 1957 |
In 1957, the company established the Yagisawa Mine (Fukushima Prefecture). |
| 1957-04 |
Established Yagisawa Mine (now Yagisawa Crushed Stone Co., Ltd.). |
| 1958-04 |
Established Shiriya Mine. |
| 1959-05 |
Established the Mitaka Research Center in April 1989 (renamed Research and Development Center, moved to Hinode Town, Tokyo in October 1994, renamed Research and Development Department in April 2003). |
| 1964-07 |
Established Nagao Mountain Quarry. |
| 1965-10 |
Established Kurehara Quarry (renamed Yamaguchi Quarry in October 1988, abolished in March 2023). |
| 1968 |
In 1968, the company participated in capital investment in Hibi Joint Smelting Co., Ltd., advancing into copper smelting business. |
| 1968-11 |
Established Nihon Kinzoku Kogyo Co., Ltd. and Furukawa Kogyo Co., Ltd. (now Furukawa Machinery & Metals Co., Ltd.) through joint investment to establish Hibi Joint Smelting Co., Ltd. |
| 1971 |
The Tori Mountain Mine, opened in 1971, boasts a top-level annual limestone production of 14 million tons, with an estimated reserve of over 1 billion tons. |
| 1971-04 |
Established Tori Mountain Mine. |
| 1972-06 |
Abolished Iojima Mine and withdrew from the coal business following the closure of Iojima Coal Mine. |
| 1973-10 |
Established machinery division. |
| 1975 |
The Karezari Copper Mine in Iran, which began operation in 1975 and was sold to the Iran Copper Industry Corporation in 1991. |
| 1975-03 |
Started operation of the Karezari Copper Mine in Iran (sold to Iran Copper Industry Corporation in 1991). |
| 1978-03 |
Relocated headquarters to 2-3-2 Marunouchi, Chiyoda-ku, Tokyo (Yusen Building, 6th Floor). |
| 1979-04 |
Abolished Kamaishi Mine; the Kamaishi Mine was succeeded by Kamaishi Mining Co., Ltd. |
| 1985-04 |
The Chemical Products Division was established in April 1993 (renamed Environmental Sales Division, established environmental division, some businesses integrated into resource division). |
| 1989-04 |
Established real estate division. |
| 1990 |
The Atacama Copper Mine in Chile, which started exploration in 1990 and has been operational since 2003. |
| 1990-10 |
Started trial operation of El Roble Copper Mine in Colombia (full operation from January 1991, sold to Colombia corporation in June 1998). |
| 1991 |
Sold to Iran Copper Industry Corporation in 1991. |
| 1997-03 |
Established Port Kembla Copper Company in Australia through joint investment with Furukawa Metal Resources Co., Ltd., Nippon Iwai Co., Ltd. (now Sojitz Corporation), and Itochu Corporation. |
| 1998 |
Sold to a Colombian corporation in 1998. |
| 1998-05 |
Established Sodegaura Logistics Center. |
| 2003 |
The Atacama Copper Mine in Chile has been in operation since 2003. |
| 2003-01 |
Started trial operation of Atacama Copper Mine in Chile (full operation from June of the same year). |
| 2006-06 |
Transferred shares of Port Kembla Copper Company owned by the company to Furukawa Metal Resources Co., Ltd., withdrawing from management. |
| 2013 |
In 2013, the company added Hachinohe Mine, a group company, to operate a total of seven limestone mines—five directly managed and two group-operated—in Japan. |
| 2013-04 |
Established Kagoshima Plant. |
| 2013-09 |
Established Renewable Energy Division. |
| 2013-10 |
Acquired shares of Sumitomo Metal Mining Co., Ltd. (now Hachinohe Mine Co., Ltd.) from Nippon Steel & Sumitomo Metal Corporation (now Nippon Steel Corporation), making it a subsidiary. |
| 2013-12 |
Obtained SGEC Forest Management Certification for Shiraoi State Forest. |
| 2017-10 |
Additional shares of Arcelor Mines Co., Ltd. were acquired to develop copper mines in Chile, making it a subsidiary. |
| 2022-04 |
Transitioned from the First Section to the Prime Market due to the reorganization of the Tokyo Stock Exchange market segments. |
| 2025-06 |
Established Shiramizu Koshiki, a geothermal power generation project in Kirishima City, Kagoshima Prefecture, through joint investment with Electric Power Development Co., Ltd. |
| 2026-03 |
Established Nittetsu Mining USA LLC, a subsidiary in the United States, to participate in copper mine development projects. |
