I can't help thinking you guys are putting a much too low valuation on Zola gas. I've just spent the last 5 minutes trying to find my previous posts regarding the sale of BHP Browse Basin gas reserves but have failed. However I can assure you if you divide the TCF's into the amount BHP received it worked out at $665M/tcf.
Now look at this very interesting article and that figure ($660M/tcf) comes up again. (My calculator is not very accurate at this time of the night but I'm sure I am correct)