Global miner Rio Tinto will buy back up to $US3 billion of its corporate notes as part of continuing efforts to reduce gross debt.
The offer for its 2018, 2020, 2021 and 2022 notes is open until June 13.
The company in April bought back corporate debt worth $US1.4 billion.
The mining giant reported a $US866 million loss in 2015, and has outlined sharp cuts in capital expenditure and operating costs over the past few years as it confronts a prolonged downturn in commodities prices.
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