anyone know processing costs/tonne?

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?