Australia, Oct. 6 -- Mitsui & Co., Ltd. ("Mitsui") has decided to invest in the development of three new deposits at West Angelas iron ore mine owned by Robe River Joint Venture ("Robe River J/V"), which is jointly owned by Mitsui, major resource company Rio Tinto and Nippon Steel to maintain its production capacity. The development is expected to cost A$998million in total (approximately 94.8billion yen), of which Mitsui will invest A$329million (approximately 31.3billion yen). The project has now received the major necessary approvals, and the first production is scheduled to commence in 2027.Robe River J/V began shipments in 1972 and has since played a key role in stabilizing Mitsui's long-term earnings base as one of its core businesses...