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
- 2007
- The platinum processing plant began operations
- 2012
- An yttrium processing plant began operations
- 2019
- Processing plant stop operation
Nitrate solution processing plant began operations - 2020
- Acquire ISO 9001 certification(Partial process)
PGM recycling began operations - 2021
- ISO 45001 certification was obtained