Gold production for the calendar year to date now totals 19,200oz.
Commercial production was declared at the mine in Liberia on March 1 and since then production has been stable with recovery levels in excess of 90%.
In future, production guidance will be pubished on a quarterly basis, Aureus added.
Mining operations at New Liberty continue to focus on both the Kinjor and Larjor pits.
David Reading, chief executive, said: "We are encouraged that the process plant is now continuously performing in line with design specifications, and are confident that we will see increased levels of gold production and operational improvements in the coming months as we continue to optimise the operations."
Design capacity at the mine is 119,000 ounces per year.