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| 1937 | Established as Japan Zinc Smelting Co., Ltd. Constructed the Annaka Smelter and Refinery Started electrolytic zinc smelting |
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| 1939 | Japan Zinc Co., Ltd., purchased the Taishu Mine |
| 1941 | Company names (Japan Zinc Smelting Co., Ltd., and Japan Zinc Co., Ltd.) changed to TOHO ZINC CO., LTD. |
| 1949 | Listed on the Tokyo Stock Exchange and the Osaka Securities Exchange |
| 1950 | Purchased the Chigirishima Smelter and Refinery |
| 1951 | Started production of lead bullion at the Chigirishima Smelter and Refinery |
| 1952 | Established Annaka Transportation Co., Ltd. |
| 1955 | Started electrolytic lead refining at the Chigirishima Smelter and Refinery |
| 1963 | Constructed the Onahama Smelter and Refinery Started zinc roasting and sulfuric acid production at the Onahama Smelter and Refinery |
| 1966 | Constructed the Fujioka Smelter and Refinery (now the Fujioka Works) Started pig iron production |
| 1967 | Started electrolytic iron refining at the Fujioka Smelter and Refinery Established Toho Trade Co., Ltd. Established Toho Carrier Co., Ltd. |
| 1968 | Established Chigirishima Transportation Co., Ltd. |
| 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 Co., Ltd.) Established Chugoku Environment Analytical Center Co., Ltd. |
| 1973 | Succeeded in commercialization of a method to recover valuable metals such as zinc oxide from electric furnace dust |
| 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 cadmium oxide production at the Annaka Smelter and Refinery |
| 1990 | Started used nickel-cadmium battery recycling business at the Onahama Smelter and Refinery |
| 1991 | Established joint venture Dalian Jingya Electric Co., Ltd., in Dalian, China as a production base for electronic components |
| 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 joint venture Dalian Tianma Electrical Co., Ltd., in Dalian, China as an overseas base for the procurement of equipment and materials |
| 2000 | The Fujioka Works purchased electrolytic iron business from Showa Denko K.K. |
| 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 joint venture Tianjin Toho Lead Recycling Co., Ltd., in Tianjin, China as a production base for a lead recycling business |
| 2006 | Established joint venture Gunma Kankyo Recycle Center Co., Ltd., together with Furukawa Co., Ltd. |
| 2010 | Made Australia-based CBH Resources Ltd. a wholly owned subsidiary |
| 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 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 | Commenced electric power selling business with the mega solar facility at Fujioka works |
| 2019 | Participated in Abra lead-silver project through its wholly-owned Australian mining company CBH Resources 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 |
| 2023 | Opened Abra Mine in W.A., Australia |
Annaka Smelter and Refinery
Taishu Mine
Chigirishima Smelter and Refinery
Onahama Smelter and Refinery
Fujioka Smelter and Refinery
Toho-go freight train for sintered concentrates that ran between Onahama and Annaka
Qaleh-Zari Mine in Iran
Sales base established in Hong Kong
Tank-house at the Annaka Smelter and Refinery
Rasp Mine in Australia
Abra Mine in W.A., AustraliaCopyright © TOHO ZINC CO., LTD. All rights reserved.
