SheepskinIt is easily calculated if you use the experience of...

Sheepskin

It is easily calculated if you use the experience of what BHP got for Browse.

If you accept the proven reserves (come in Tonga!) of Zola/Bianchi are 2 TCF then Tap's share is 10% or 2 hundred BCF (ie one fifth of a TCF) One fifth of $665M (what BHP got per TCF) equals $130M. (Do you get it?)

Tallaganda (WA-351-P part) likely has 500 BCF (?) (I suppose this will be confirmed by the Tallaganda Appraisal well to be drilled later this year). So Tap's share would be 20% of 500 BCF equalling 100 BCF (or one tenth of a TCF) So Tap's share of Tallaganda would be one tenth of $665 M. That means Tap's share of Tallaganda would be worth $66.5 Million.

Zola and Tallaganda would be worth $130M plus $66M equals $200 million. (I can't put it more simply than that)

NOTE
Of course I could be hopelessly wrong because I am a rank amateur in this field and maybe I have overlooked something quite fundamental.