Ore costs

I will reword what I have written as I assume a presentation by SDL wouldn't state a much higher price then it actually is to ship.

But my question is where does the $20 come from and what does it matter how much you can get it out of the ground for if labor, shipping etc cost so much more and make a $20 tonne into $63 shipped? Why not just state the end price, because cheap African ore seems nearly as expensive as Australia after reading the presentation.