History

1658
Kizaemon Niihara, a pot merchant from the Sendai City, the Kagoshima Prefecture,discovered the Kushikino Vein No.1
1906
Mitsui Mining Unlimited Partnership took over the operations
1914
Completion of the first whole-sliming cyanidation smelter in japan
1939
Daily production of ores reached 1,300 tons
1943
Operations suspended due to the gold mining prohibition during the World War ll
1949
Operations resumed
1964
Mitsui Kushikino Mining Company Limited was founded, separate from the Mitsui Mining & Smelting Company Limited
1978
The gold and silver recycling plant began operations
1987
A joint mining concession to the Akeshi Mine was granted, and operations were begun
1996
Mining was suspended at the Kushikion Mine
2003
ISO 14001 certification was obtained
2004
OHSAS 18001 certification was obtained
2007
The platinum processing plant began operations
2009
Mining resumed at the Kushikino Mine
2012
An yttrium processing plant began operations