Gold mineralization at Sukari is hosted exclusively by porphyry. The lack of significant gold grades in chemically reactive serpentinitic wall rocks can be explained in one of two ways:

• The porphyry represented a favourable host either because of its composition, relative to mineralising fluids, or its mechanical properties or both.

• The Sukari Porphyry was relocated, relative to wall rock sequences, by faulting after gold mineralization.

While significant post-mineralization faulting has possibly occurred, the second scenario is unlikely. Porphyry dykes in the hangingwall of the main porphyry body show gold mineralization of essentially the same character as that in the main porphyry and wall rocks immediately adjacent to those dykes are also barren. Those dykes range in thickness from a few centimetres to several metres. It is not reasonable to postulate that they, along with the main porphyry body, were all relocated by faulting after mineralization.

Certainly it is evident that the Sukari Porphyry has acted as a rigid body surrounded by weaker rocks. Footwall and hangingwall rocks have taken up strain by development of strong schistosity, almost certainly accompanied by large decreases in volume. The porphyry has taken up strain by development of predominantly brittle fault structures.

The porphyry host for the mineralization has a strike length of approximately 2,300 m, and ranges in thickness from 100 m to approximately 600 m (Cavaney 2005). Gold mineralization within this is not continuous and its deposition has been influenced by major long-lived structures, the most important of which are tabular sheets of crackle breccia.

Ore and waste are mined using conventional open pit mining methods. The operation utilises selective mining techniques to separate ore and waste. Provision has been made for drilling and blasting all primary and oxide materials.

Utilising the Company's owner-operator fleet, an accelerated waste-stripping programme commenced in Q4, focusing on:
- Stage 5 west wall pushback and Stage 4 west remediation to recommence mining H2 2021;
- Eastern area preparation works ahead of commencement of the contractor waste-stripping programme;
- Pioneering works on the north section of the Sukari hill in preparation to commence open pit mining on the Cleopatra Zone.

The Sukari underground mine is a trackless diesel mine, with all equipment rubber tyred and self- powered. The workings are accessed via a ramp system declining at a gradient of 1 in 7. Levels are typically developed at 15 metre vertical intervals, although this is dependent on orebody geometry and mining method.

Mining method: Long-hole stoping, room and pillar, avoca modified.

Backfilling will continue during 2021, using cemented rock fill, wich allows a bottom-up mining method. This has proven effective at maximising extraction of the orebody, improving geotechnical ground support, and reducing overall dilution and good for waste management in the underground operations. Study and design work is well advanced for the implementation of paste fill plant in 2022, wich will replace CRF where possible.

On February 8, 2022, Centamin has announced that, following an independently managed contractor tender process, the underground operations at its Sukari Gold Mine will transition from contractor-mining to owner-operator mining with immediate effect.

A detailed transition plan to owner-operator mining is in place with implementation underway, including utilising a third-party underground mining specialist to assist with workforce training. The company has also executed its contractual right to purchase the current underground mining fleet from the incumbent contractor for a total capital cost of US$10.5 million to be paid this quarter, Q1 2022.

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The process route encompasses:
• Crushing;
• Stockpiling crushed ore;
• Grinding;
• Flotation of a bulk sulphide concentrate;
• Thickening of the concentrate and the flotation tailings;
• Fine milling of the concentrate;
• Leaching the precious metals from the concentrate and/or flotation tailings in a dilute cyanide solution;
• Adsorbing the precious metals onto activated carbon;
• Eluting (or desorbing) the precious metals from the carbon;
• Recovering the precious metals as gold doré;
• Combining the flotation tailings and leached concentrate and pumping to the TSF.

Flotation
Two flotation circuits are installed and designed to be operated in parallel. The flotation circuits are designed to recover a bulk sulphide concentrate for further comminution and subsequent leaching. The circuits are designed to operate 24 hours a day, seven days a week with a utilization of 91.3%.

The Stage 1/2 flotation circui ........