The mine produced 25,608 ounces of gold in the June quarter, and sold 25,797oz.
The performance surpassed the December quarter of 2016's record of 22,994oz of gold.
The Western Australian operation has reached an annualised production rate of 100,000oz per annum thanks to the commissioning of the Hermes satellite pit.
"Second quarter production at the Plutonic gold operations was at its highest level since we acquired the asset in October 2016," Superior president and CEO Chris Bradbrook said.
"As expected, production was also significantly higher than in the first quarter of this year as underground mining activities returned to higher grade zones and ramp up of production continued at Hermes.
"We expect production to continue to increase in t...