Regis Resources (ASX:RRL) said group mineral resources have increased to 8.3 million ounces and ore reserves to 2 million ounces as of Dec. 31, 2025, up from 7.5 million ounces and 1.7 million ounces, respectively, at Dec. 31, 2024, according to a Wednesday Australian bourse filing.

The company said Duketon reserves have grown by 307,000 ounces, or about 30%, to 38 million tonnes at 1.1 grams per tonne gold for 1.4 million ounces of gold as at Dec. 31, 2025, with Garden Well underground ore reserve growing by over 257,000 ounces, or 120%, to 474,000 ounces at 8.5 million tonnes at 1.70 g/t gold.

Overall underground reserve growth was about 2.4 times the underground depletion of 116,000 ounces, marking the sixth consecutive year of underground reserve growth, the filing added.

The company has declared an initial open-pit resource for Southern Star at 1.9 million tonnes at 1.1 g/t gold for 69,000 ounces, reported within an AU$3,900 per ounce pit shell, while total underground ore reserve additions of 1.3 million ounces at the Tropicana joint venture since 2018 have exceeded depletion of 808,000 ounces by about 500,000 ounces.