Affiliated Business


Affiliated Business Image

Providing Management Support to Address the Issues Faced by Diverse Group Companies

Related businesses center on engineering and trading companies that support the operations of Mitsubishi Materials’ businesses. These companies are expanding their sphere of activities from Japan to locations overseas.

Business Summary

Hokuryo Corp. Bibai Strip MineHokuryo Corp. Bibai Strip Mine

Our engineering companies offer comprehensive engineering services, such as designing nonferrous metal, chemical, pharmaceutical and diverse other plants, as well as providing maintenance services after the plants are constructed. Our trading companies engage in unique businesses, including domestic coal extraction and jewelry sales. In the regional development arena, we operate a wide range of companies that produce salt from seawater, operate golf courses and sports facilities, and conduct tours at disused mining sites.



First Company in the Japanese Salt Industry to Acquire Halal Certification

Products of Diasalt Corp. Products of Diasalt Corp.

Diasalt Co., Ltd., whose main product is table salt, was the first company in the Japanese salt industry to acquire halal certification, conferred by the Japan Halal Association, an NPO.
Halal certification ensures that a high-quality product is produced under safe and hygienic conditions in accordance with Islamic law. Halal-certified products include healthy foods, cosmetics and pharmaceuticals, among others, and indicates that these products can be used by Muslims with peace of mind.
Using clean seawater from Gotonada, Nagasaki Prefecture, as its main ingredient, Diasalt manufactures safe and high-quality dietary salt under excellent hygienic conditions. Diasalt has now gone one step further to satisfy conditions defined by Islamic law, enabling the company to acquire halal certification.



Sado Gold MineSado Gold Mine

Dia Plaza Co., Ltd. Akita Athletic ClubDia Plaza Co., Ltd. Akita Athletic Club

Mitsubishi Materials Trading Corp. Mitsubishi Jewelry Collection (MJC)Mitsubishi Materials Trading Corp.
Mitsubishi Jewelry Collection (MJC)

Many of the Company's related businesses got their start as departments supporting the Group's coal and metal mining operations. Mitsubishi Materials Techno Corporation started by providing mine maintenance and construction services, while Diasalt Co., Ltd., was originally tasked with finding effective uses for low-quality coal and supplying drinking water. Kanko Kodo was established to provide employment at disused metal mines and communicate our history of industrial development to future generations.

1947 Established Ryoko Sangyo Corporation (now Mitsubishi Materials Trading Corporation)
1950 Established Ote Real Estate Corporation (now Mitsubishi Materials Real Estate Corporation)*
1955 Established Sakito Salt Corporation (now Diasalt Co., Ltd.)
1958 Established Ote Kosan Co., Ltd. (now Mitsubishi Materials Techno Corporation)
1961 Established Hokuryo Sangyo Corporation (now Hokuryo Corporation)
1963 Established Tohoku Automobile Kogyo Corporation (now Diaplaza Corporation)
1969 Established Toi Marine Kanko Co., Ltd.
1970 Established Golden Sado Inc.
1974 Established Silver Ikuno Inc.
2003 Transferred nuclear power engineering business to Mitsubishi Materials Techno Corporation
2015 Transferred jewelry business to Mitsubishi Materials Trading Corporation

*:Jurisdiction of General Affairs dept.