As a result, OceanaGold says the company's 2018 gold production guidance range has been revised upwards to between 500,000 and 540,000 ounces.
Chief executive Mick Wilkes says the company has had a strong operating and financial performance in the first half of this year with operations achieving better-than-expected results.
"With the improvement to the mineplan, Didipio continues to outperform and present opportunities for further optimisation while ramp-up of the underground is progressing nicely.
"Operating performance at Haile has been strong with recent solid plant performance while mining activities are gradually improving. In New Zealand, after a slow start Waihi is back on track while Macraes is slightly exceeding expectations with improved plant performance and a steady feed of higher grade ore from Coronation North," Wilkes said.
"With the increase to our production guidance and strong financial performance, we fully expect to maintain our standing as one of the most profitable gold companies globally."