| 1874 |
The Mitsui Clan acquires the cornice horizontal pit (Jabarabira-koh) at Kamioka mine and begins mining operations. |
| 1892 |
The Mitsui Mining Limited Partnership is established. |
| 1911 |
Mitsui Mining Co., Ltd. is founded. |
| 1913 |
The Omuta Zinc Smelter begins operations. |
| 1928 |
The Hikoshima Zinc Smelter (currently Hikoshima Smelting Co., Ltd.) is acquired from Suzuki Shoten. |
| 1943 |
The electrolytic zinc plant at the Kamioka Mine and Smelter (currently Kamioka Mining & Smelting Co., Ltd.) is completed.
The Hibi Copper Smelting Plant (currently Hibi Kyodo Smelting Co., Ltd.) and Takehara Refinery plant (currently Takehara Refinery) are acquired from Showa Mining Co., Ltd. |
| 1950 |
Mitsui Mining Co., Ltd. spins off its metals division to create Kamioka Mining & Smelting Co., Ltd. (the company's former name). |
| 1951 |
The Tokyo laboratory (currently Corporate R&D Center) is established. |
| 1952 |
The company is renamed Mitsui Mining & Smelting Co., Ltd. |
| 1962 |
Ohji Metals Co., Ltd. and Showa Die-cast Co., Ltd. are incorporated into the Mitsui Mining & Smelting Co., Ltd.
The Rolled Copper Division (currently the Rolled Copper & Zinc Division) and the Die-Casting Division (currently the Die-Casting Division and the Automotive Parts & Components Division) are established. |
| 1967 |
Hachinohe Smelting Co., Ltd. is founded. |
| 1968 |
Hibi Kyodo Smelting Co., Ltd. is founded. |
| 1976 |
Oak-Mitsui Inc. is founded. |
| 1980 |
Mitsui Metal Foil Co., Ltd. and Sankin Rare Earth Co., Ltd. are incorporated into the Mitsui Mining & Smelting Co., Ltd.
The Ageo Metal Foil Plant (currently Copper Foil Sector Ageo Copper Foil Plant) is established.
The Miike Rare Metal Plant is established.
Taiwan Copper Foil Co., Ltd. is established. |
| 1982 |
A company-wide division system is adopted.
The Copper Foil Division (currently the Copper Foil Sector) is established. |
| 1986 |
The catalyst division is established.
The Nirasaki Plant of the Parts & Components Division is completed.
Ageo Copper Foil Plant No. 2 is completed.
Kamioka Mining & Smelting Co., Ltd., Hikoshima Smelting Co., Ltd., and Miike Smelting Co., Ltd. are founded. |
| 1987 |
GECOM Corp. is established. |
| 1989 |
Mitsui Copper Foil (Malaysia) SDN. BHD. is founded.
MCS Corp. is established. |
| 1990 |
Mitsui Kinzoku Perlite Co., Ltd., Dicalite Orient Co., Ltd., and Tokyo Koukyu Rozai (T.K.R.) Co., Ltd. are incorporated into the company, and Perlite Division and the TKR Division (currently ceramics Division) are established.
A new corporate symbol is adopted and the corporate name is standardized as "Mitsui Kinzoku".
|
| 1995 |
Mitsui Siam Components Co., Ltd. and Mitsui-Huayang Automotive Components Co., Ltd. are established.
|
| 1998 |
Mitsui Copper Foil (Hong Kong) Co., Ltd. is founded. |
| 1999 |
Mitsui Components Europe Ltd. is founded.
The Head Office is moved to Osaki, Shinagawa-ku, Tokyo. |
| 2000 |
Mitsui Electronic Materials Co., Ltd. is founded in Taiwan.
Pan Pacific Copper Co., Ltd. is founded as a joint investment with Nippon Mining & Metals Co., Ltd. |
| 2001 |
Mitsui Copper Foil (Guangdong) Co., Ltd. is founded.
The Environmental Engineering Sector (currently Metals, Minerals & Environmental Engineering Sector) is established. |
| 2002 |
Mitsui Components Guangdong Co., Ltd. is established.
MS Zinc Co., Ltd. is founded as a joint investment with Sumitomo Metal Mining Co., Ltd.
Mitsui Micro Circuits Taiwan Co., Ltd. is established. |
| 2003 |
Ohi Seisakusho Co., Ltd. becomes a wholly owned subsidiary of Mitsui Mining & Smelting Co., Ltd. through a share exchange. |
| 2005 |
Mitsui Kinzoku Trading (Shanghai) Co., Ltd. is established.
Mitsui Kinzoku Components India Private Limited is established.
Mitsui Kinzoku Korea Co., Ltd. is established. |
| 2006 |
The Palka mine (Peru) begins full-scale operation.
Shanghai Mitsui Xin Yun Precious and Rare Metal Recycle Co., Ltd. is founded.
Mitsui Kinzoku Catalyst Zhuhai Co., Ltd. is founded. |
| 2007 |
Advanced Sensor Division and China Business are established.
Mitsui Kinzoku (Shanghai) Management Co., Ltd. is established. |
