| 1943 Jun. |
KUNIMINE MINING CO., LTD. established. |
| 1946 Feb. |
Changes the company name to KUNIMINE KOKA KOGYO CO., LTD. |
| 1949 Dec. |
Merges with Tsukinunogawa Mining Co., Ltd. (acquires the Aterazawa Factory and the Tsukinuno Mining Station) and starts mining of bentonite ores and manufacture of products using them. |
| 1956 Mar. |
Opens the Ota Factory in Hitachi-Ota, Ibaraki. |
| 1963 Jan. |
Starts processing of agrochemical formulations in the Aterazawa Factory. |
| 1967 Aug. |
Opens the Zao Factory in Karita-gun, Miyagi and starts manufacture and sale of calcium-type bentonite. |
| 1970 Apr. |
Establishes KAWASAKI MINING CO., LTD. in Miyagi (capital: 1 million yen, capital contribution ratio: 50%). |
| 1970 May. |
Starts manufacture of agrochemical bases in the Aterazawa Factory and the Ota Factory. |
| 1971 Nov. |
Starts manufacture of activated bentonite (Neokunibond) in the Zao Factory. |
| 1973 Nov. |
Establishes an R&D laboratory for clay minerals in the Aterazawa Factory and succeeds in commercializing pure montmorillonite (KUNIPIA) using crude ores in the Tsukinuno Mining Station. |
| 1978 Jun. |
Changes the company name to KUNIMINE INDUSTRIES CO., LTD. |
| 1980 Aug. |
Completes a laboratory in Kuroisho, Tochigi, and moves the laboratory in the Aterazawa Factory to the new laboratory. |
| 1983 Mar. |
Opens the Iwaki Factory & Laboratory in the Kashima industrial complex in Joban, Fukushima. |
| 1986 Jun. |
Opens the Onahama Factory in the Onahama coastal industrial complex in Fukushima and starts processing of agrochemical formulations. |
| 1989 Jun. |
The company's shares are registered with the Tokyo District Office of the Japan Securities Dealers Association. |
| 1990 May. |
Opens the Mito Factory in Hoi-gun, Aichi and starts manufacture of bentonite. |
| 1992 Dec. |
Establishes TRANS WORLD PROSPECT CORPORATION in Texas, U.S. (capital: US$1.4 million, capital contribution ratio: 71.4%). |
| 1994 Jul. |
Spins off the mining department and establishes KUNIMAIN CO., LTD. (capital: 2.5 million yen, capital contribution ratio: 100%). |
| 2000 Mar. |
Acquires 100% of the shares of KAWASAKI MINING CO., LTD. |
| 2004 Dec. |
Cancels registration as an over-the-counter-company with the Japan Securities Dealers Association and lists its shares on the JASDAQ Securities Exchange. |
| 2008 Apr. |
Acquires 100% of the shares of KANTO BENTONITE MINING CO., LTD. and KANBEN MINING CO., LTD. and has 100% ownership of both companies. |
| 2010 Apr. |
Lists its shares on the JASDAQ of the Osaka Stock Exchange following the merger between them and the JASDAQ Securities Exchange. |
| 2012 Jan. |
Acquires the Koriyama Factory from BASF Japan Ltd. |
| 2013 Jul. |
Lists its shares on the JASDAQ (standard) of the Tokyo Stock Exchange following the merger between them and the Osaka Stock Exchange. |
| 2015 Jan. |
Establishes KUNIMINE (THAILAND) CO., LTD. in Thailand (capital: 4 million Thai bahts, capital contribution ratio: 49.0%). |
| 2015 Mar. |
Makes a market shift from the JASDAQ (standard) of the Tokyo Stock Exchange to their second section. |
| 2016 Apr. |
Changes the company name KANTO BENTONITE MINING to KUNIMINE MARKETING CO., LTD. |
| 2018 Mar. |
Listed on the Tokyo Stock Exchange first section. |
