HmmmmmmI am not sure what your point is - the ore at Murrin has...

Hmmmmmm

I am not sure what your point is - the ore at Murrin has differing grades and spec qualities. Sure they did try and use the higher quality stuff during the last 18 months - but the mine resource is to last at least 30 years. Remember this is a laterite mining operation and you are going to get very low spec differentials. It means they may have to go out and re look at the pits they closed during the GFC or ramp up exploration again.
I don't think this is a big issue in the scheme of the operations - we are already in marginal sectors for mining this stuff anyway.