Ann: Redstone Notice Declaring Offer Free of Defeating Conditions, page-135

Im not 100% sure on Rineharts port capacity but if she were to turn ridley on she would need AGOs port capacity.

30 year mine life of high grade ore is a long time of secured profit to add under her belt.
If a rail system was made to port ( 75km only ) this would benefit the project greatly and provide a means of cheaper transport if ever high grade ore prices were to come into discount.
DYOR
Still a firm hold in my opinion