The Damang ore body is hosted by a north to north-easterly plunging antiform, developed within Tarkwaian sediments. The main Damang pit is located close to the closure of the antiform, and all other known mineralisation is located on the east and west limbs of the Damang anticline. The mine exploits fresh hydrothermal and oxide mineralisation in addition to Witwatersrand-style, palaeoplacer mineralisation.

Palaeoplacer mineralisation.
There are three gold-bearing conglomerate horizons recognised on the western limb of the Damang anticline. From footwall to hangingwall, these are known as the Star/Composite, Malta/Breccia and Gulder Reefs. There are also three gold-bearing conglomerate horizons recognised on the eastern limb, namely the Lima, Kwesie-K1 and Kwesie-K2 Reefs. These conglomerate horizons are separated by poorly-mineralised sandstone units.

The reefs are usually characterised by a fining upwards sequence of poorly to moderately sorted, clast-supported polymictic conglomerates. However, local variations are observed where the conglomerate domain is interbedded with fine to coarse grained, poorly sorted sandstones. The Star/Composite, Malta/Breccia and Gulder Reefs on the west limb and the Lima, Kwesie-K1 and Kwesie-K2 Reefs on the east limb of the Damang anticline contain higher gold grades than the poorly mineralised sandstone units, which separate the reefs. The conglomerate reefs may contain between 1.3 and 1.5 g/t gold, and the poorly mineralised sandstone units usually contain between 0.1 and 0.2 g/t gold.

Hydrothermal mineralisation.
Hydrothermal gold mineralisation at Damang occurs in pyrite and pyrrhotite alteration selvages, which are usually less than one metre wide and located immediately adjacent to en-echelon quartz veins. Gold is also associated with accessory vein minerals such as carbonate, muscovite, tourmaline, ilmenite and apatite. These alteration zones are often linked and may result in significant volumes, characterised by intense veining and gold mineralisation.

Damang has two open pits constituting the Mineral Reserves, seven open pits comprising the Mineral Resources, one ore stockpile.

Using open-pit, conventional drill and blast with truck and shovel methods, mining operations are carried out by contract mining. Mining is focused on the Damang complex. Gold mineralisation is mined selectively to COG and segregated into grade ranges to balance ore production and processing capacities. The east wall of Damang has been monitored to mitigate geotechnical challenges, with additional controls implemented to ensure safe operations. There were no changes in the wall angles over the past 18 months. The east wall is now used as a geotechnical berm (and second form of egress) to catch any material movement off the upper east wall. Drape meshing in hard rock has been done for the majority of the wall to prevent scats plus ongoing pre-split and wall control blasting.

Deposition of tailings is occurring on the Far East TSF (FETSF), which was commissioned in January 2018. In addition, the second stage of the downstream embankment lift, which commenced in November 2019, has been completed. The third stage of construction activities commenced in 2021.

The East TSF (ETSF) was constructed as a combined TSF and waste dump using compacted earth fill and fresh waste rock for the embankment construction. Closure deposition of tailings into the ETSF was embarked upon in early 2017 until January 2018 when the deposition ceased.

The FETSF is located south of the existing ETSF abutting the ETSF’s south embankment. The FETSF has been designed and constructed with a compacted clay liner across the facility basin and upstream slopes. The facility is planned to be constructed through five stages and has a remaining LoM storage capacity of approximately 18Mt. The ANCOLD consequence classification for FETSF is High C. The South TSF (STSF), also with earth fill embankments, has been closed and is fully rehabilitated. The ETSF and STSF have an ANCOLD consequence classification of High B and Significant, respectively.

Mining in the Damang pit will be completed in 2022; only the Huni and the small Lima Kwesi Gap (LKG) pit will be mined in 2023. The processing plant is planned to continue through to 2025 treating stockpiled lower grade ore.

Mining of the Huni pit extension was approved in early 2021, and mining commenced in H1 2021 and will be completed in 2023.

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The Damang Mine operates a carbon-in-leach (CIL) processing plant which is fed run-of-mine (ROM) ore at approximately 12,600 dry tonnes per day (4.5 million tonnes per annum). Plant feed consists of 100% fresh (blasted) hard rock.

The milled ore is classified by means of a cyclone with the overflow reporting to a pre-leach thickener. The thickened leach feed (50% solid density) reports to the eight CIL tanks (3000 m3 each). The final leach tails report to two tails tanks and pumped to the tailings dam. The cyclone underflow returns to the ball mill for regrinding.

The underflow stream is also bled to feed 2 x 48” Knelson concentrators. The concentrate from the Knelsons is leached directly in an in-line leach reactor (ILR) at high cyanide concentration. The leached tails from the ILR reports to the Ball Mill for regrinding after the clarified pregnant solution has been transferred to the electrowinning circuit and the remaining solids have been subjected to several wash cycles using raw water. The wash water is collected into either the electrowinning circuit or transferred to the CIL circuit for recovery of residual soluble gold, depend on the stage of washing. The pre leach thickener overflow joins the process water pond as recycled water. Loaded carbon from the CIL is acid washed and eluted at high pressure and temperature. Gold is finally recovered by electrowinning of the pregnant solution and smelting of the cathodes with flux.

The cyanide facilities at the Damang Gold Mine are:
- solid cyanide storage area; ? mixing and storage tanks;
- leaching facilities, including CIL tanks and ILR;
- tailings storage tanks; and
- tailings storage facility and tailings delivery pipeline.