"We see a massive potential in green iron industry out of Australia, supplying China," CEO says.
The company says the Star-Orion South project is the largest undeveloped diamond deposit in the world.
Freeport McMoran, which owns 51% of the mine, plans to invest around $7.5 billion to expand.
BofA led the way in deal value at $5.4 billion, while RBC advised on the most deals with six.