1954 Oita Mining was established through a joint venture between Furukawa Mining (currently Furukawa ネット競馬アプリ., Ltd.) and Hokoku Cement (currently Mitsubishi Materials Corporation).
1959 Participation in the management of Tokuyama Soda (currently Tokuyama)
1962 Expanded production capacity to 100,000 tons/month
1967 Started bench cut use as part of the glory hole rib ore processing, increased production capacity to 200,000 tons/month
1971 Full-scale switch to bench cut
1972 Started cooperative ネット競馬アプリ with neighboring companies
1976 Extended coastal pier, increased ship loading capacity to 1,800 tons/hour
2000 Completed equipment for unmanned ネット競馬アプリ of upper transport line, completed private power generation facilities. Completed construction work for the lower transport line belt conveyor.
2009 Started ネット競馬アプリ of raw material washing equipment
2013 Completed the eastern outlet facility
2015 The mining area of Miyazaki Mining ネット競馬アプリ., Ltd. was incorporated, and the name was changed to "Shin-Oita Mine."
2022 Construction of the Eastern Ore Extraction Facility (System II) was completed.
2023 The shaft ore extraction facility and upper transportation line were ecommissioned, and operations began using only the Eastern Ore Extraction Facility.
