The world's biggest iron ore producer Rio Tinto will raise $9 billion in U.S. investment-grade bonds as it seeks to fund its recently-closed buyout of Arcadium Lithium , the miner said on Wednesday.

Rio Tinto is tapping the US investment-grade bond market Tuesday to raise between $7-billion and $9-billion for its just-closed acquisition of Arcadium Lithium, according to people familiar with the matter.

Rio Tinto Group said it’s seeking to sell bonds in the US to help repay a bridging loan used to finance its $6.7 billion acquisition of Arcadium Lithium Plc.

The world's biggest iron ore producer Rio Tinto is offering $9 billion in U.S. investment-grade bonds as the miner seeks funding for its recently-closed buyout of Arcadium Lithium, Bloomberg News reported on Tuesday.

Rio Tinto has successfully raised $9bn through a US investment-grade bond sale to fund its acquisition of Arcadium Lithium, reported Bloomberg, citing sources. The debt was divided into eight segments,