| 1937 |
Founded as "Japan Zinc Refining Co., Ltd.". Constructed Anchu Refinery and started zinc electrolysis. |
| 1937 |
Established as Japan Zinc Smelting Co., Ltd. Constructed the Annaka Smelter and Refinery. Started electrolytic zinc smelting. |
| 1937 |
Established as Nippon Zinc Refining Co., Ltd. |
| 1937 |
Established as Japan Zinc Smelting Co., Ltd. Constructed the Annaka Smelter and Refinery Started electrolytic zinc smelting |
| 1939 |
Acquired the Taisyu Mine by "Japan Zinc Co., Ltd.". |
| 1939 |
Japan Zinc Co., Ltd., purchased the Taishu Mine. |
| 1939 |
Constructed Annaka Smelter |
| 1939 |
Started electrolytic zinc refining |
| 1939 |
Japan Zinc Co., Ltd. purchased the Taishu Mine |
| 1941 |
Changed the company name (Japan Zinc Refining Co., Ltd. and Japan Zinc Co., Ltd.) to "Toho Zinc Co., Ltd.". |
| 1941 |
Company names (Japan Zinc Smelting Co., Ltd., and Japan Zinc Co., Ltd.) changed to TOHO ZINC CO., LTD. |
| 1941 |
Nippon Zinc Co., Ltd. acquired the Tsushima mine |
| 1941 |
Changed the company name (Nippon Zinc Refining Co., Ltd. and Nippon Zinc Co., Ltd.) to Toho Zinc Co., Ltd. |
| 1949 |
Listed on the Tokyo Stock Exchange and Osaka Securities Exchange. |
| 1949 |
Listed on the Tokyo Stock Exchange and the Osaka Securities Exchange. |
| 1949 |
Listed on the Tokyo Stock Exchange and Osaka Securities Exchange |
| 1949 |
Listed on the Tokyo Stock Exchange and the Osaka Securities Exchange |
| 1950 |
Acquired the Chikura Refinery. |
| 1950 |
Purchased the Chigirishima Smelter and Refinery. |
| 1950 |
Acquired Kejima Smelter |
| 1950 |
Purchased the Chigirishima Smelter and Refinery |
| 1951 |
Started crude lead production (Chikura Refinery). |
| 1951 |
Started production of lead bullion at the Chigirishima Smelter and Refinery. |
| 1951 |
Started crude lead production (Kejima Smelter) |
| 1951 |
Started production of lead bullion at the Chigirishima Smelter and Refinery |
| 1952 |
Established "Anchu Transportation Co., Ltd.". |
| 1952 |
Established Annaka Transportation Co., Ltd. |
| 1952 |
Established Anchu Transport Co., Ltd. |
| 1955 |
Started electrolytic lead refining (Chikura Refinery). |
| 1955 |
Started electrolytic lead refining at the Chigirishima Smelter and Refinery. |
| 1955 |
Started production of electrolysis lead (Keijima Smelter) |
| 1955 |
Started electrolytic lead refining at the Chigirishima Smelter and Refinery |
| 1963 |
Constructed the Onahama Refinery and started zinc roasting and sulfuric acid production (Onahama Refinery). |
| 1963 |
Constructed the Onahama Smelter and Refinery. Started zinc roasting and sulfuric acid production at the Onahama Smelter and Refinery. |
| 1963 |
Constructed Onahama Smelter, began zinc roasting and sulfuric acid production (Onahama Smelter) |
| 1963 |
Constructed the Onahama Smelter and Refinery Started zinc roasting and sulfuric acid production at the Onahama Smelter and Refinery |
| 1966 |
Constructed the Fujioka Refinery (now Fujioka Business Office) and started pig iron production. |
| 1966 |
Constructed the Fujioka Smelter and Refinery (now the Fujioka Works). Started pig iron production. |
| 1966 |
Constructed Fujioka Smelter (now Fujioka Business Office), started pig iron production |
| 1966 |
Constructed the Fujioka Smelter and Refinery (now the Fujioka Works) Started pig iron production |
| 1967 |
Started electrolytic iron refining. Established "Toho Trade Co., Ltd." and "Toho Career Co., Ltd.". |
| 1967 |
Started electrolytic iron refining at the Fujioka Smelter and Refinery. Established Toho Trade Co., Ltd. Established Toho Carrier Co., Ltd. |
| 1967 |
Started electrolytic iron smelting (Fujioka Smelter) |
| 1967 |
Established Toho Trade Co., Ltd. |
| 1967 |
Established Toho Career Co., Ltd. |
| 1967 |
Started electrolytic iron refining at the Fujioka Smelter and Refinery Established Toho Trade Co., Ltd. Established Toho Carrier Co., Ltd. |
| 1968 |
Established "Chikura Transportation Co., Ltd.". |
| 1968 |
Established Chigirishima Transportation Co., Ltd. |
| 1968 |
Established Keijima Transport Co., Ltd. |
| 1969 |
Started operation of dedicated tank freight train "Toho-go" transporting calcined ore from Onahama Refinery to Anchu Refinery. Began development of the Gran Bretagna Mine in Peru and the Karezari Mine in Iran. |
| 1969 |
Started operating the dedicated tank freight train Toho-go for long-distance shuttle transport from the Onahama Smelter and Refinery to the Annaka Smelter and Refinery. Started development of the Gran Bretana Mine in Peru. Started development of the Qaleh-Zari Mine in Iran. |
| 1969 |
Started operation of dedicated tank freight train "Toho-go" for long-distance piston transport of calcined ore from Onahama Smelter to Anchu Smelter |
| 1969 |
Initiated development of the Gran Bretania Mine in Peru |
| 1969 |
Initiated development of the Karezari Mine in Iran |
| 1969 |
Started operating the dedicated tank freight train Toho-go for long-distance shuttle transport from the Onahama Smelter and Refinery to the Annaka Smelter and Refinery Started development of the Gran Bretana Mine in Peru Started development of the Qaleh-Zari Mine in Iran |
| 1972 |
Established "Toho Development Engineering Co., Ltd." (now "TDE Corporation") and "China Environmental Analysis Center". |
| 1972 |
Established Toho Development Engineering Co., Ltd. (now TDE Co., Ltd.). Established Chugoku Environment Analytical Center Co., Ltd. |
| 1972 |
Established Toho Development Engineering Co., Ltd. (now TDE Corporation) |
| 1972 |
Established China Environmental Analysis Center Co., Ltd. |
| 1972 |
Established Toho Development Engineering Co., Ltd. (now TDE Co., Ltd.) Established Chugoku Environment Analytical Center Co., Ltd. |
| 1973 |
Succeeded in commercializing methods to recover valuable metals such as zinc oxide from electric furnace dust. |
| 1973 |
Succeeded in commercialization of a method to recover valuable metals such as zinc oxide from electric furnace dust. |
| 1973 |
Succeeded in commercializing method to recover valuable metals such as zinc oxide from electric furnace dust |
| 1973 |
Succeeded in commercialization of a method to recover valuable metals such as zinc oxide from electric furnace dust |
| 1975 |
Started sales of lead soundproof panels under the registered trademark Soft Calm. Provided technology for the construction of the annual 50,000-ton electric zinc smelter at Goryeo Zinc Corporation in Korea. |
| 1975 |
Started marketing lead sound insulating boards under the registered trademark SOFT CALM. Licensed technology to Korea Zinc Co., Ltd., of South Korea for the construction of the Onsan Refinery with an electrolytic zinc production capacity of 50,000 tons per year. |
| 1975 |
Started sales of lead soundproof boards under the registered trademark Soft Calm |
| 1975 |
Provided technology for the construction of Korea Koryo Zinc's Wonsan Smelter with an annual capacity of 50,000 tons of electrolytic zinc |
| 1975 |
Started marketing lead sound insulating boards under the registered trademark SOFT CALM Licensed technology to Korea Zinc Co., Ltd., of South Korea for the construction of the Onsan Refinery with an electrolytic zinc production capacity of 50,000 tons per year |
| 1988 |
Started manufacturing cadmium oxide (Anaka Smelter). |
| 1988 |
Started cadmium oxide production at the Annaka Smelter and Refinery. |
| 1988 |
Started production of cadmium oxide (Anchu Smelter) |
| 1988 |
Started cadmium oxide production at the Annaka Smelter and Refinery |
| 1990 |
Started recycling business for used nickel-cadmium batteries (Onahama Smelter). |
| 1990 |
Started used nickel-cadmium battery recycling business at the Onahama Smelter and Refinery. |
| 1990 |
Started recycling business for used nickel-cadmium batteries (Onahama Smelter) |
| 1990 |
Started used nickel-cadmium battery recycling business at the Onahama Smelter and Refinery |
| 1991 |
Established a joint venture "Dalian Jingya Electric Co., Ltd." in Dalian, China, as a production base for electronic components. |
| 1991 |
Established joint venture Dalian Jingya Electric Co., Ltd., in Dalian, China as a production base for electronic components. |
| 1991 |
Established Dalian Jing-A Electric Co., Ltd. in Dalian, China, as a production base for electronic components |
| 1991 |
Established joint venture Dalian Jingya Electric Co., Ltd., in Dalian, China as a production base for electronic components |
| 1994 |
Established "Komei Trading Co., Ltd." (now "Toho Zinc Hong Kong Limited") in Hong Kong as a sales base for electronic components. Established a joint venture "Zhucheng Huari Powder Metallurgy Co., Ltd." in Zhucheng, China, as a production base for powder metallurgy. |
| 1994 |
Established Guang-Ming Trading Limited (now TOHO ZINC Hong Kong Co., Ltd.) in Hong Kong as a sales base for electronic components. Established joint venture Zhucheng Huari Powder Metallurgy Products Co., Ltd., in Zhucheng, China as a production base for powder metallurgy products. |
| 1994 |
Established Hong Kong "Kwang Ming Trading Co., Ltd." (now "Toho Zinc Hong Kong Limited") as a sales base for electronic components |
| 1994 |
Established a joint venture "Zhucheng Huari Powder Metallurgy Co., Ltd." in Zhucheng City, China, as a production base for powder metallurgy |
| 1994 |
Established Guang-Ming Trading Limited (now TOHO ZINC Hong Kong Co., Ltd.) in Hong Kong as a sales base for electronic components Established joint venture Zhucheng Huari Powder Metallurgy Products Co., Ltd., in Zhucheng, China as a production base for powder metallurgy products |
| 1996 |
Established a joint venture "Dalian Tenma Electric Co., Ltd." in Dalian, China, as an overseas procurement base for machinery and materials. |
| 1996 |
Established joint venture Dalian Tianma Electrical Co., Ltd., in Dalian, China as an overseas base for the procurement of equipment and materials. |
| 1996 |
Established a joint venture "Dalian Tianma Electric Co., Ltd." in Dalian City, China, as an overseas procurement base for machinery and materials |
| 1996 |
Established joint venture Dalian Tianma Electrical Co., Ltd., in Dalian, China as an overseas base for the procurement of equipment and materials |
| 2000 |
Acquired electrolytic iron business from "Showa Denko K.K." (Fujieda Plant). |
| 2000 |
The Fujioka Works purchased electrolytic iron business from Showa Denko K.K. |
| 2000 |
Acquired electrolytic iron business from Showa Denko K.K. (Fujoka Plant) |
| 2003 |
Invested in Australian mine company "CBH Resources Ltd." to ensure stable raw ore supply. Established "Toho Zinc (Shanghai) Trading Co., Ltd." in Shanghai as a sales base for electronic components. |
| 2003 |
Invested in CBH Resources Ltd., an Australian mining company, with the aim of ensuring a stable supply of raw materials. Established TOHO ZINC Shanghai Co., Ltd., in Shanghai as a sales base for electronic components. |
| 2003 |
Invested in Australian mine company "CBH Resources Ltd." to ensure stable raw ore supply |
| 2003 |
Established "Toho Zinc (Shanghai) Trading Co., Ltd." in Shanghai as a sales base for electronic components |
| 2003 |
Invested in CBH Resources Ltd., an Australian mining company, with the aim of ensuring a stable supply of raw materials Established TOHO ZINC Shanghai Co., Ltd., in Shanghai as a sales base for electronic components |
| 2005 |
Established a joint venture "Tianjin Toho Lead Resources Recycling Co., Ltd." in Tianjin, China, as a production base for lead recycling. |
| 2005 |
Established joint venture Tianjin Toho Lead Recycling Co., Ltd., in Tianjin, China as a production base for a lead recycling business. |
| 2005 |
Established a joint venture "Tianjin Toho Lead Resources Recycling Co., Ltd." in Tianjin, China, as a production base for lead recycling business |
| 2005 |
Established joint venture Tianjin Toho Lead Recycling Co., Ltd., in Tianjin, China as a production base for a lead recycling business |
| 2006 |
Completed a medical waste treatment facility at the joint venture "Gumma Environmental Recycling Center Co., Ltd." with "Furukawa Metal & Machinery Co., Ltd.". |
| 2006 |
Gunma Kankyo Recycle Center Co., Ltd., a joint venture with Furukawa Co., Ltd., completed medical waste treatment facility. |
| 2006 |
Completed a medical waste treatment facility at the joint venture "Gumma Environmental Recycling Center Co., Ltd." with Furukawa Metal & Machinery Co., Ltd. |
| 2010 |
Fully acquired Australian "CBH Resources Ltd.". |
| 2010 |
Made Australia-based CBH Resources Ltd. a wholly owned subsidiary. |
| 2010 |
Fully acquired Australian "CBH Resources Ltd." |
| 2010 |
Made Australia-based CBH Resources Ltd. a wholly owned subsidiary |
| 2011 |
The Onahama Smelter suffered extensive damage from the Great East Japan Earthquake but was restored early. Completed a new electrolytic zinc plant (Anaka Smelter). |
| 2011 |
The Onahama Smelter and Refinery sustained serious damage in the Great East Japan Earthquake, but recovered quickly. Completed new zinc electrolysis tank-house at the Annaka Smelter and Refinery. |
| 2011 |
Odawara Smelter suffered extensive damage from the Great East Japan Earthquake but was restored early |
| 2011 |
Completed a new electrolytic zinc smelting plant (Anaka Smelter) |
| 2011 |
The Onahama Smelter and Refinery sustained serious damage in the Great East Japan Earthquake, but recovered quickly Completed new zinc electrolysis tank-house at the Annaka Smelter and Refinery |
| 2012 |
Increased electrolytic silver production capacity to 400 tons per year (Keshima Smelter). The Rasup Mine in Australia opened. |
| 2012 |
Increased the Chigirishima Smelter and Refinery's production capacity of electrolytic silver to 400 tons per year. Opened CBH Resources Ltd.'s Rasp Mine in Australia. |
| 2012 |
Increased electrolytic silver production capacity to 400 tons per year (Kei Island Smelter) |
| 2012 |
The Luspe Mine in Australia "CBH Resources Ltd." was opened |
| 2012 |
Increased the Chigirishima Smelter and Refinery's production capacity of electrolytic silver to 400 tons per year Opened CBH Resources Ltd.'s Rasp Mine in Australia |
| 2014 |
Started power generation business using mega solar at Fujieda Plant. |
| 2014 |
Commenced electric power selling business with the mega solar facility at Fujioka works |
| 2014 |
Started power sales business using mega solar power generation at Fujoka Plant |
| 2019 |
Participated in the development of the Abra lead mine through "CBH Resources Ltd." in Australia. |
| 2019 |
Participated in Abra lead-silver project through its wholly-owned Australian mining company CBH Resources Ltd. |
| 2019 |
Participated in the development project of Abura Lead Mine in Australia through "CBH Resources Ltd." |
| 2021 |
Divided the company to strengthen the lead business and established "Toho Keshima Smelting Co., Ltd.". |
| 2021 |
Chigirishima refinery was spun off to newly established Toho Chigirishima Refinery Co., Ltd. to strengthen the competitiveness of the lead smelting and refining business |
| 2021 |
Divided the company to strengthen lead business and established "Toho Keijima Smelting Co., Ltd." |
| 2023 |
The Abra Mine in Western Australia opened. |
| 2023 |
Opened Abra Mine in W.A., Australia |
| 2023 |
The Abura Mine in Western Australia was opened |
