prom hill is worth about $1.7bn

and that would be on just on copper at $1.50 and an estimated cost of production of US$0.85c a lb
NO gold
The return on that money would be
$430,413,223
OR 25%

Prominent Hill
Reserves 1.3Moz gold, 7.0Moz silver, 1.9Mt copper (Resources: 3.7Moz gold, 15.8Moz silver, 1.9Mt copper

assumptions
1. 10% lose of product
2. long term cost of production (estimate is US$0.85)
3. long term price for copper US$1.50
4. profit discounted another 10% for risk of not producing forecast earnings.
5. Gold and silver including in cost projection

copper reserves - 1.9m tonnes
1 tonne = 2,204lbs
4,187.6 lbs
discounted 10% for lose in production
3,806,909,091 lbs
long term price for copper = US$1.50
costs based on estimate '09 of .85
long term costs $1
profit $0.50
Total $1,903,454,546
discounted 10% for future risk
$1,730,413

so if you include the cost of the plant of $1.3bn

you get this calculation

$1,730,413
-$1,300,000,000
$430,413,223
US$0.137

1.17 x 1.19

AUD$0.16 per ozl share


based on info on P20 of the annual report
http://www.ozminerals.com/Media/docs/oxiana_review_07_web-2d9f24d8-5164-426c-aa1e-2594fed5a587-0.pdf