The Prieska Deposit is a VMS-style deposit, with mineralisation defined along 2.4km of a northwest-southeast trending strike extent and down to a depth of 1.25km. Mineralisation of Cu, Zn, silver (Ag) and gold (Au) is in massive sulphides distributed as a persistent lens within gneiss rock assemblages.

Satellite deposit potential has been demonstrated with recent intersections of sulphide mineralisation at Ayoba, 5km from the proposed Prieska ore processing plant. Further afield, available historical data and recent exploration work by Orion has confirmed the existence of numerous follow-up massive sulphide Cu-Zn-rich targets within the nearby mineral tenements also held by Orion.

The mineralised zone outcrop has a strike of 2,400m, is oxidised and / or affected by leached and supergene enrichment to a depth of approximately 100m and crops out as a well- developed gossan. It has a dip of between 55° and 80° to the northeast at surface and a strike of 130° to the north. Current drilling indicates that the Deep Sulphides has a strike length of at least 2860m in depth.

The thickness of the mineralised zone exceeds 30m in places but averages between 7m and 9m. The mineralised zone persists to a depth of 1,100m (as deep as 1,228m in one section) after which it is upturned due to the folding.

Both underground and open pit mining are planned for the Foundation Phase. Underground mining is planned to commence on completion of mine dewatering, shaft refurbishment and underground infrastructure establishment, expected to be 27 months from Project approval. Underground mining is forecast to build up over 20 months to a steady-state run-of-mine production rate of 200 thousand tonnes per month (ktpm) or 2.4Mtpa. Open pit mining is planned after exhausting underground material at a production rate of 100ktpm.

Tunnel development remaining from the previous mining operations allows for early access to underground production mining areas. A combination of Longhole Open Stoping with Fill (LHOSF) and Drift-and-Fill (D&F) mining methods will be used, supported with paste back-filling. Some low-profile, D&F mining is planned in the latter years, along with open-pit mining of the near-surface +105 Level Supergene Deposit in the back two years of the mining plan.

The LoM plan contains 25.2Mt of material at an average grade of 1.0% Cu and 3.3% Zn from underground and 1.9% Cu and 2.4% Zn from the open pit. This is expected to produce 226kt of Cu and 680kt of Zn contained in differentiated concentrates. The updated LoM plan contains an additional 20% RoM material compared to the BFS-19 plan.

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