Fortescue Metals Group shares surged today after it surprised the market by completing a $US2.3 billion ($A2.9 billion) debt refinancing, while also benefiting from a much-needed lift in iron ore prices.

Fortescue Metals Group shares surged today after it surprised the market by completing a $US2.3 billion ($A2.9 billion) debt refinancing, while also benefiting from a much-needed lift in iron ore prices.