They've got 150bcf at Liulin after partner shares so try the $5 on that and its revenue flows of $750M.
Extraction costs should not be more than 20%.
Sale transactions for unimproved gas fields suggest a value for the Liulin Field of 40cps+. Add on the Aussie reserves and you're looking at a compamy with a conservative fundamental value right now of 60cps+.