This sounds good on the face of it but what margin could you...

This sounds good on the face of it but what margin could you expect them to make on such low grade ore with a recovery rate fo 50-60%?
I don't know much about the technology but surely it must cost them at least a few bucks a tonne to process?
And for every tonne processed they are likely to recover about 1kg of copper which is worth about A$3.50. Surely processing costs would have to at least a couple of bucks/tonne?

Thoughts?