Shares in Fortescue Metals Group have climbed to a new high of $6.25 this year after the company announced it has refinanced $US2.04 billion of its debt to help deliver further expansion for the iron ore miner.

Shares in Fortescue Metals Group have climbed to a new high of $6.25 this year after the company announced it has refinanced $US2.04 billion of its debt to help deliver further expansion for the iron ore miner.