The Thunderbox operation is located in the North Eastern Goldfields situated southeast of Leinster, Western Australia. It consists of multiple deposits over a substantial land package that has mostly been extracted utilising open pit mining methods. Development of the Thunderbox underground began in 2018 and the first production stope was taken in July 2020. The Thunderbox project maintains a processing facility with a capacity of 2.5Mtpa with both SAG and Ball mills followed by conventional CIL and elution circuits. In September 2021, a plan has been outlined to expand the mill to 6.0Mtpa.