Mine life of the project has been extended out to 2033, with average output overall put at 180,00-200,000oz per annum and "approximate" all-in sustaining costs of $800 per ounce.
Based on current reserves and a gold price of US$1500 per ounce, the project has an after tax net present value of $892 million.
Using "market consensus gold pricing" increases the NPV estimate to $1 billion.
Haile's reserves total 53 million tonnes grading 1.7 grams per tonne gold for 2.9 million ounces of gold.
OceanaGold's other major operating theatre is New Zealand, while the Didipio operation in Philippines is closed due to socio-political issues.
Shares in OceanaGold were down 6% to A$2.41 in morning on trade on a down-day for the ASX gold patch.
At that price OceanaGold is capitalised at $1.5 billion - or about US$1 billion!
