I think the main problem for Cliffs and HWE is that they would need to remove the shiploader to get at the ore.. it is easier to just give it away and save the clean up costs.. the infrastructure and ore is worth very little to them if they have to clean up.. Where as, PLV only need to remove the shiploader and extend the seawall to extend the pit.. they then use the island for the next 20-30-40 years what ever it ends up being, the costs will be spread over that time.. a great deal for both parties..
If there is a lot more high grade ore lower down, a cutback to get to it would have to be looked at for cost and other feasability options.
