Kamioka Mining & Smelting Co., Ltd.

Mitsui Group commenced mining operations in Konoha.

Mitsui Group acquired the Sabaura Flat Pit of Konooka Mine and began mining operations.

The Mitsui Clan acquires Jabarabira pit at Kamioka Mine and begins mining operations.

Mitsui Mining Partnership was established.

Mitsui Mining Limited Partnership is established.

Mitsui Mining Co., Ltd. was established.

Reorganized as Mitsui Mining Co., Ltd.

Initial zinc was produced from the first horizontal distillation furnace at the Omuta Zinc Refinery (Asamuta).

The first zinc is produced from Horizontal Distillation Furnace No. 1 at Omuta Zinc Smelting Plant (Asamuta).

Mitsui Mining Co., Ltd. began operations as the Omuta Zinc Refinery attached to Konooka Mine.

Operations commence as Omuta Zinc Smelting Plant affiliated with the Kamioka Mine of Mitsui Mining Co., Ltd.

Acquired the Hikoshima Zinc Refinery (now Hikoshima Refining Co., Ltd.) operated by Suzuki Shoten.

Hikoshima Zinc Smelting Plant (currently Hikoshima Smelting Co., Ltd.) is acquired from Suzuki Shoten.

Acquired the Hibi Refinery (now Hibi Refining Plant) and Takehara Electric Refinery (now Takehara Refining Plant) from Showa Mining Co., Ltd., and established the Hibi Refining Plant.

Hibi Smelting Plant (currently Hibi Smelter) and Takehara Refinery Plant (currently Takehara Refinery) are acquired from Showa Mining Co., Ltd. and Hibi Smelter is created.

Separated the Takehara Electric Refinery from the Hibi Refining Plant and established the Takehara Refining Plant.

Takehara Refinery Plant is separated from Hibi Smelter, and Takehara Refinery is created.

Established Konoha Mining Co., Ltd. (the predecessor of our company). Renamed to Mitsui Metal Mining Co., Ltd.

Established Konooka Mining Co., Ltd. (the predecessor of our company) by acquiring the metal division of Mitsui Mining Co., Ltd.

Listed on the First Section of the Tokyo Stock Exchange.

Mitsui Mining Co., Ltd. spins off its metals division to establish Kamioka Mining and Smelting Co., Ltd. (The predecessor company of Mitsui Mining & Smelting Co., Ltd.).

Kamioka Mining and Smelting Co., Ltd. is listed on the First Section of the Tokyo Stock Exchange.

Established the Tokyo Research Institute (now the Basic Evaluation / Functional Materials Research Institute).

Tokyo Laboratory (currently Materials Analysis & Exploration Center/R&D Center) is created.

Changed the company name from Konooka Mining Co., Ltd. to Mitsui Metal Mining Co., Ltd.

Kamioka Mining and Smelting Co., Ltd. is renamed Mitsui Mining & Smelting Co., Ltd.

Commenced automotive equipment business. Established the Die Casting Division.

Absorbed and merged with Oji Metal Industry Co., Ltd. and Showa Diecast Co., Ltd., establishing the Copper Extension Division and Diecast Division.

Ohji Metals Co., Ltd. and Showa Die-cast Co., Ltd. are merged into Mitsui Mining & Smelting Co., Ltd, and Rolled Copper & Zinc Division and Die-casting Division are created.

Separated the Kushikino Mining Office and established Mitsui Kushikino Mining Co., Ltd.

Acquired all shares of Santa Lucia Mining Co., Ltd.

Kushikino Mining is separated and Mitsui Kushikino Mining Co., Ltd. is established.

The purchase of all shares of Compania Minera Santa Luisa S.A. is completed.

Established YAHO Refining Co., Ltd.

Hachinohe Smelting Co., Ltd. is established.

Commenced full-scale operations at One Sura Mine (Peru).

Established Hibi Joint Refining Co., Ltd.

Huanzala Mine (Peru) began its full-scale operations.

Hibi Kyodo Smelting Co., Ltd. is established.

Established Mitsui Grinding and Abrasives Co., Ltd.

Mitsui Grinding Wheel Co., Ltd. is established.

Established Oak-Mitsui Inc.

Oak-Mitsui Inc. is established in the USA.

台湾銅箔股份有限公司設立

Merged Mitsui Metal Foil Manufacturing Co., Ltd. and Mitsui Rare Earth Co., Ltd. into our company, establishing the Ageo Metal Foil Plant (now Ageo Copper Foil Plant) and Miki Rare Metal Plant.

Established Taiwan Copper Foil Co., Ltd.

Mitsui Metal Foil Co., Ltd. and Sankin Rare Earth Co., Ltd. are merged into Mitsui Mining & Smelting Co., Ltd. Ageo Metal Foil Plant (currently Ageo Copper Foil Plant) and Miike Rare Metal Plant are created.

Taiwan Copper Foil Co., Ltd. is established in Taiwan.

Transitioned to a company-wide division system.

Mitsui Mining & Smelting Co., Ltd. becomes a profit center organization.

Established Oku-Aizu Geothermal Co., Ltd.

Okuaizu Geothermal Co., Ltd. is established.

Separated the Kamioka Mining Office and Hikoshima Refinery, establishing Kamioka Mining Co., Ltd. and Hikoshima Refining Co., Ltd.

Established Miki Refining Co., Ltd.

Kamioka Mining and Hikoshima Refinery are separated and reestablished as Kamioka Mining & Smelting Co., Ltd. and Hikoshima Smelting Co., Ltd.

Established GECOM Corp.

Established Mitsui Copper Foil (Malaysia) Sdn. Bhd.

Established Your Software Co., Ltd.

Established MCS Co., Ltd.

Established Mitsui Siam Components. Established the Pearlite Division. Established Mitsui Copper Foil (Hong Kong) Ltd. Established Mitsui Components Europe.

Merged Tokyo Premium Furnace Materials Co., Ltd., Mitsui Metal Perlite Co., Ltd., and DikaLite Orient Co., Ltd., establishing the TKR Division (now Ceramics Division) and Perlite Division.

Unified the name to 'Mitsui Metal' and introduced a new symbol.

Established Mitsui Siam Components Co., Ltd.

Established Mitsui Copper Foil (Hong Kong) Ltd.

Moved headquarters to Osaki, Shinagawa-ku, Tokyo.

Established Mitsui Components Europe Ltd.

Established Taiwan Tega Co., Ltd. Co-founded Pan Pacific Copper Co., Ltd. with Nippon Mining Metal Co., Ltd. Co-founded MS Zinc Co., Ltd. with Sumitomo Metal Mining Co., Ltd. Established Guangdong Mitsui Automotive Parts Co., Ltd. Established Mitsui Kinzoku Components India. Fully acquired Okai Manufacturing as a subsidiary. Established Mitsui Metal (Zhuhai) Environmental Technology Co., Ltd. Commenced full operations at Parca Mine (Peru).

Established Taiwan Teck Co., Ltd.

Established Pan Pacific Copper Co., Ltd. through joint investment with Nippon Mining & Metals Co., Ltd. (now JX Metals Co., Ltd.)

Established Mitsui Copper Foil (Guangdong) Co., Ltd.

Established Guangdong Mitsui Automotive Parts Co., Ltd.

Established M.S. Zinc Co., Ltd. through joint investment with Sumitomo Metal Mining Co., Ltd.

Established Taiwan Micro Electric Co., Ltd.

Fully acquired Daiichi Manufacturing Co., Ltd. through a stock exchange.

Established Mitsui Metal Trading (Shanghai) Co., Ltd.

Established Mitsui Kinzoku Components India Private Limited.

Established Mitsui Metal Korea Co., Ltd.

Commenced full operations at Palca Mine (Peru).

Established Shanghai Mitsui Xinyun Qi Rare Metal Recycling Co., Ltd.

Established Mitsui Metal (Zhuhai) Environmental Technology Co., Ltd.

Established Mitsui Metal (Shanghai) Enterprise Management Co., Ltd.

Established Mitsui Metal Act Co., Ltd. Integrated the copper alloy business with Sumitomo Metal Mining Co., Ltd. and established Mitsui Sumitomo Metal Mining Copper Alloy Co., Ltd. Established PT. Mitsui Kinzoku Catalysts Jakarta. Established Mitsui Metal Special Ceramics (Suzhou) Co., Ltd. Established Automotive Components Technology India Pvt. Ltd. Established Mitsui Metal Measurement Machinery Co., Ltd. Established MITSUI KINZOKU ACT MEXICANA, S.A. de C.V. Established Mitsui Kinzoku Catalysts (Thailand). Established PT. Mitsui Kinzoku ACT Indonesia. Established Mitsui Kinzoku Catalysts Vietnam. Established Mitsui Kinzoku Catalysts America. Commenced full operations at Chile Caserones Mine. Established Mitsui Metal Die Casting Co., Ltd. Solar power plant began operation at Hikoshima Refinery Co., Ltd. Established Mitsui Kinzoku USA Inc. Commenced electricity sales from seven hydroelectric power plants of Konoha Mining Co., Ltd. Established MITSUI KINZOKU ACT TANGER MAROC SARL.

Established Mitsui Sumitomo Metal Mining Copper (Ltd.) by integrating Sumitomo Metal Mining Co., Ltd.'s copper business.

Established Mitsui Metal Act Co., Ltd. by integrating the Automotive Components Division and Daiichi Manufacturing Co., Ltd.

Established Automotive Components Technology India Pvt. Ltd.

Established PT. Mitsui Kinzoku Catalysts Jakarta.

Established Mitsui Metal Aikato (Shanghai) Management Co., Ltd.

Established Mitsui Metal Special Ceramics (Suzhou) Co., Ltd.

Established MITSUI KINZOKU ACT MEXICANA, S.A. de C.V.

Integrated the Measurement Systems Division with Mitsui Metal Kyushu Machinery Co., Ltd., and established Mitsui Metal Measurement Machinery Co., Ltd.

Sold Mitsui Zinc Powder LLC to Horsehead Corporation.

Commenced power sales at seven hydroelectric power plants of Kamioka Mining Co., Ltd.

Kamioka Mining & Smelting Co., Ltd.started selling electricity from seven hydraulic power plants.

Transferred ownership of Oak-Mitsui Inc. Established Nibih Manufacturing Co., Ltd. Co-founded Nippon Caserones Resources Co., Ltd. with JX Metal Co., Ltd. Established Mobility Business Division. Discontinued Mobility Business Division.