Our History
Our origin is to develop the resources that are blessings from the earth and perform smelting of nonferrous metal.
We have continued to provide materials and products that are essential to many industries by giving added value tononferrous materials through processing and assembly. We will strive to create new value utilizing our core technologies
cultivated by our nonferrous metal smelting business, such as in separation and purification, powder control,
electrochemistry, and solution chemistry.

Areas that our current core business domains＊ Lists only major events and initiatives.

1989

1874

Acquired Jabaradaira pit at the Kamioka mine

Developed non-destructive inspection equipment to measure
the sugar content of fruits and vegetables by applying
technology used for underground resource exploration satellites

Started full operation at
the Huanzala mine, Peru

1968

Mining and Resource development

2012

Measuring instruments

Established Mitsui Kinzoku Instrumentations
Technology Corporation

2006

Started full-scale operation
at the Pallca mine in Peru
Started to develop copper foil technology at
Takehara refinery plant

Copper foils

1959

Established Taiwan Copper Foil Co., Ltd. in Nantou, Taiwan
Established Mitsui Copper Foil (Malaysia) SDN.BHD in Selangor, Malaysia

1962

1968

1976

Started production ofcopper foil at Ageo

1943

1980 1986

1991

Established Oak-Mitsui Inc.
in New York, USA

20181999 Developed MicroThinTM

Increased production capacityof MicroThinTM to 3.9 million m2
per monthcopper foil with carrier film

Established Ageo plant 2

2000

Established Hibi Smelting Co., Ltd.

Established Pan Pacific Copper Co., Ltd.
jointly with Nippon Mining & Metals Co., Ltd.

2020

Coppermass production of PVD material
1985 Startedat Miike rare metal plant1977Acquired Hibi smelting plant andTakehara refinery plant

Started production of Cerium oxideabrasive for glass substrate

1963

Started production of electrolytic
manganese dioxide(EMD) atTakehara refinery plant

1949
1913

1958

Rare metals

Started to develop exhaustgas detoxifying catalysts
technology at the Central
Research Laboratory1970

at Kamioka

Sold Catalysts to1976 Japanese automobilemanufactures

1981

1962

1966

Started production of hydrogen storage
alloy at Takehara refinery plant

1993

Zinc and Lead
1987 1989

Established Showa Die-Cast Co., Ltd.

1951

1962

Established rolled copper division

Established the mass production process ofIGZO, a next generation oxide
semiconductor material
Expanded the catalyst production

2006 manufacturing plant in2018 capacity for automobiles at theZhuhai, China

five overseas sites

solid electrolyte for next2016 Developedgeneration lithium-ion batteries

Battery materials

Started full operation of recycle-

1995 smelting of lead from waste

Started operation at new Zinc
electrolytic plant in Kamioka

Launched Omuta zinc smelting
plant
Started technological partnership withWilmot Breeden of the U.K. for automotive
door latch production in 1965

Established the bonding
factory in Pheongtaek,South Koreabatteries at Kamioka

Established Die-casting division

1953

Catalysts

Sputtering targets

2013

Established catalyst

Started operation atKamioka catalyst plant

1990

2005

Established Mitsui Electronicmaterials Co., Ltd. in Tai chung,Taiwan

1989 Developed
high density ITO

production of battery-use
1972 Started
zinc powder at Kamioka mining plant

Started production of Cadmiumoxide for nickel-cadmium battery
at Hikoshima smelting plant

Completed Zinc

1943 electrolytic plant

Started development of transparent
conductive thin films at the Central
Research Laboratory

2000

Established
GECOM Corp.
in Indiana, USA

Establishedautomotive partsdivision

1995

Established MITSUI SIAMCOMPONENTS CO., LTD. in Thailand

Established Mitsui Kinzoku Die-Casting2014 Technology Co., Ltd.

Die casting

Automotive parts

2010

Integrated automotive parts division and Ohi
Seisakusho Co., Ltd., and established Mitsui
Kinzoku ACT Corporation

Rolled copper and brass

2010

Integrated rolled copper business with that of Sumitomo
Metal Mining and established Mitsui Sumitomo Metal
Mining Brass & Copper Co., Ltd.

Acquired Ohji plant from Special Alloy Co., Ltd.
and established Ohji Metals Co., Ltd.

OthersSales breakdown
in FY1960¥29.5 billion＊Non-consolidated sales

31.4％

Metals business

Assembly processing

OthersAutomotive components/Die casting/
Catalysts etc.

Engineering/
Other services

14.3％

Zinc/Lead/Refined copper/Sulfuric acid

68.6％

32.9％

Basic materials

Sales breakdown
in FY1990

52.8％¥269.6 billion

Copper foil/Battery materials/
PVD materials/TAB/Rolled copper/
Rare metals etc.

06

MITSUI KINZOKU Integrated Report 2021

15.9％

Assembly processing

Zinc/Lead/
Refined copper/
Sulfuric acid/Alloys

Intermediatematerials

Mining and basic materials

Automotive components/
Die casting/Catalysts etc.

＊Excludes sales of gold bullion from thefinancial statement values of that time.
＊Business segments are shown in thesegments at that time.

Zinc/Lead/Refined copper/
Sulfuric acid/Alloys/Ores etc.

30.3％

Sales breakdown
in FY2000

19.1％¥423.7 billion＊Business segments are shown inthe segments at that time.

34.8％
Intermediate materials

Copper foil/Battery materials/PVD materials/
TAB/Rolled copper/Rare metals etc.

MITSUI KINZOKU Integrated Report 202107