Ann: Investor Presentation, page-124

My thinking is that $710 (60/93 ×1100) represents PV10 of each 5 year block on Pioneer acreage

PV10 = $1100 (first 5 years only as per reserve report)
PV10 (in year 5) =$710 (Second 5 year)
PV10 (in year 5) =$710 (third 5 year block).

PV10 =$1100 +$710/1.10^5 + $710/1.10^10
=1100+440+273
=1800 in today's terms

Less 340 debt

Leaves 1450M equity

=US$2.00
=AUD$2.80

(That's based on SEC price deck which was WTI at $65)

It ignores G&A, abandonment and corporate expenses as cmon mentioned, (though I think it includes interest, as discount rate is 10% which takes into account cost of capital(assumes debt and equity receive 10%), and debt is removed from the PV10 at the end)