The Property covers a sedimentary package belonging to the Kofi Formation, which comprises argillaceousbanded carbonates and an overlying suite of arkose or greywacke where the variable content of feldspar grains is the most abundant detrital mineral rather than quartz or lithic fragments. Irrespective, both lithologies may be mineralised.

The Sadiola deposits are hosted in the Kofi Formation on the northern portion of the Kédougou-Kéniéba Inlier, on the eastern side of the SMSZ. The Kofi Formation comprises impure limestones, sandstones, black shales, pelites and greywackes as well as minor felsic to intermediate hypabyssal intrusions intruded as numerous felsic to intermediate dykes and stocks. Southwest of the main Sadiola deposit, the Kofi Formation is capped by intermediate to mafic diorites. Seven kilometres east of the Main pit, the carbonate sequence is overlain by sandstones of the Neoproterozoic Taoudeni basin that form a prominent escarpment along the strike of the inlier.

Mineralisation
Currently known gold mineralisation within the Sadiola Exploitation Permit is hosted within two major trends, the Sadiola trend in the west of the permit area and the Farabakouta East (known locally as “FE”) trend in the east.

On the Sadiola trend, gold mineralisation is associated with the north-striking Sadiola Fracture Zone (SFZ) that exploits the faulted contact between the greywacke to the west and the carbonate on the east along a 4 km st ........

Sadiola ceased mining operations in March 2018 with processing of low-grade stockpiles continuing into 2021. Mining recommenced in 2021 with the mining of oxide ore from Tambali and Sadiola Main.

Currently Sadiola consists of two open pit mines, Sadiola Main and FE3, which continue to mine oxide and transitional ore to feed the existing oxide processing facility at a rate of 5.0 Mt/a. The Tambali Mineral Reserve was mined out in 2022. Mining will expand to 10 Mt/a when the processing of primary ore commences in Q1 2026.

Mining of FE3 North will be complete in 2025 and the open pit will be used to store tailings material from the new plant until 2028. FE3 South and FE4 can receive tailings material from 2029.

Mining of the Sadiola Main and FE3 Mineral Reserves will be carried out conventional open pit extraction methods until 2038, after which low-grade stockpiles will be treated until 2041. Mining will use 300-tonne class excavators and 91-tonne class haul equipment for mining of oxide ore and the continued mining of primary ore. Studies show that there is no material upside benefit realized by using larger equipment.

A mining contractor has been contracted for the oxide mining and current contractor rates are applied to the mining of most of the pit stages apart from the deeper Sadiola Main Stages 12 and 13. Contractor budget costs were applied for mining of the primary orebodies. Allied has considered owner mining but concluded th ........

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