Rosemont

The Rosemont operations include mining across open pits and an underground mine.

The Rosemont and associated surface deposits are mined using conventional open pit mining truck and shovel methods. The Rosemont underground produces approximately 600Ktpa and is mined using mechanised open stoping.

ROSEMONT UNDERGROUND

In FY24, Regis commenced an extension to the Rosemont South underground mine, named Rosemont Stage 3.

When announced (ASX announcement) Rosemont Stage 3 held a mining inventory of 1.7Mt at 2.8 g/t Au for 157koz contained gold at a 2.3g/t cut-off grade, including a Probable Ore Reserve of 490kt at 2.6g/t Au for 41koz. The remainder is Inferred Mineral Resources and Exploration Targets.

Rosemont Stage 3 scheduled underground ore mining rates are up to ~600ktpa with a steady state annualised gold Production Target of 40koz to 50koz. The project LOM AISC is estimated at $2,400/oz to $2,500/oz.

ROSEMONT OPEN PIT

Rosemont open pit has been a key component of the Duketon South operations, with open pit mining commencing in 2013 following the development of Moolart Well (2010) and Garden Well (2011). The mine was initially developed as a single open pit and later supported by satellite deposits across the Rosemont–Baneygo corridor. Together, these sources provided consistent ore feed to the Rosemont processing plant and contributed meaningfully to sustained production and cash flow for the Duketon operations.

Open pit mining within the Rosemont open pit has now ceased, with the focus shifting to the underground operation. Exploration across the broader corridor continues to target additional large-scale, high-margin mineralisation that can leverage existing infrastructure and extend the long-term value of the district.