Rio Tinto has agreed to acquire Mitsubishi Corporation’s 11.65% interest in Boyne Smelters Ltd (BSL), which owns and operates the Boyne Island aluminium smelter in Gladstone, Australia. On completion of this transaction, and the recent agreement to acquire Sumitomo Chemical Company’s 2.46% interest in BSL, Rio Tinto’s interest in BSL will increase to 73.5%.