Summary

Deposit type

• Sediment-hosted
• Replacement
• Vein / narrow vein

Summary:

The Kinsevere deposit is a sediment hosted copper deposit with low-grade cobalt association.

The deposit is comprised of the R1, R2 and R3 subgroups of the Neoproterozoic Roan Group. Copper mineralisation is generally confined to the Mines (R2) subgroup, however, minor copper-oxide and copper-sulphide development occurs along the R1-R2 contact and the R2-R3 contact.

The deposit is located along a major structural element termed the Kinsevere lineament. Halokenetic and tectonic processes have resulted in the emplacement of discrete lower Roan (R2) stratigraphic blocks onto younger, upper Roan (R3 and above) stratigraphy.

The Kinsevere deposit is comprised of three distinct mineralisation domains: Central, Mashi and Kinsevere Hill. Central and Mashi form a contiguous sequence of mineralised Mine Series correlates that host copper-cobalt oxides and sulphides. Kinsevere Hill represents a structurally isolated occurrence of Mine Series host rocks containing copper-cobalt oxides with minor copper sulphides.

Copper oxide mineralisation is defined as material that has CuAS:CuT ratio between 0.5 to 1. The principal copper oxide mineral is malachite with subordinate chrysocolla, copper clays (Goethite and Mn-WAD), pseudomalachite and rare azurite. Tenorite, native copper and other minor copper oxide phases (Cuintergrows) are also present in minor quantities (~<5% of total Cu oxide mineralogy). The largest proportion of copper oxide mineralisation is hosted in weathered/oxidised carbonates (CMN) as fracture fill, void fill, mineral replacement and coatings. There is a strong preference for copper oxides to develop in CMN lithologies, especially within strongly weathered, brecciated and karstic zones.

Transitional and Mixed Ores (TMO) are copper ores that have an CuAS:CuT ratio between 0.2 and 0.5. Transitional ore zones are classified as zones that contain dominantly transitional copper species such as chalcocite, covellite, cuprite and native copper and are likely to have formed during progressive supergene weathering. Mixed ore zones are defined as containing both sulphide and oxide copper phases present together - particularly malachite, chalcocite and chalcopyrite.

Sulphide mineralisation at Kinsevere is defined by all material that has an CuAS:CuT ratio < 0.2. Sulphide mineralisation at Kinsevere has several different modes of development and styles. The three major types are: 1. Replacement of early diagenetic pyrite and evaporites by chalcopyrite and carrolite. 2. Replacement of carbonate minerals by copper and cobalt sulphides. 3. Sulphide bearing veins and vein replacement.

Dimensions
The mineralisation strike length is approximately 1.3 km for the Tshifufia (Central) and Tshifufiamashi (Mashi) deposits while Kinsevere Hill has a 1km strike length. The mineralisation dips sub-vertically. Mineralisation extends to 400 m at depth, and it can be up to 300m in width. The mineralisation outcropped prior to mining.

Mining Methods

• Truck & Shovel / Loader

Summary:

Mining of the Kinsevere deposits is undertaken by the open pit method, which is expected to continue throughout the life of mine. This mining method is appropriate for the style and size of the mineralisation.

Minimum mining width (bench size) is typically more than 45m but is ~35m in some isolated areas during stage development.

The operation uses a contract mining fleet of excavators and both rigid body and articulated dump trucks along with a fleet of ancillary equipment.

Comminution

Crushers and Mills

Summary:

Crushing and grinding:
- Mineral sizer - this breaks up the rock prior to the semi autogenous grinding (SAG) mill.
- Ore grinding - this uses a single stage SAG mill operating in a closed circuit. This produces a 200 micron feed, which is then directed to the leach tanks. The SAG mill operation is unusual in that sulphuric acid is added to the circuit to start the leach process early in advance of the leach tanks. The leaching process involves the extraction of copper from solid copper oxide using the sulphuric acid solution. Although the acid concentration in the SAG mill circuit is lower than that in the leach tanks, it is very effective because of the high kinetic energy in the SAG mill. The SAG mill has a mild steel shell with an epoxy coating on the inside to prevent acid erosion. The mill is topped up with concentrated acid as necessary.

Processing

• Sulfuric acid (reagent)
• Crush & Screen plant
• Flotation
• Counter current decantation (CCD)
• Agitated tank (VAT) leaching
• Acid tank leaching
• Solvent Extraction & Electrowinning
• Roasting

Summary:

Kinsevere mines and processes oxide ore. This enables the operation to use the conventional solvent extraction/electrowinning (SXEW) process (Exhibit 3) to produce A grade refined 99.99% copper cathode.

The Kinsevere operation was commissioned in 2007 as a Heavy Media Separation (HMS) operation with a copper concentrate product. The current SXEW plant was completed in 2011 and the HMS plant was closed.

Elements of the current plant and SXEW process include:

Leach tanks – these are atmospheric agitated leach tanks. The residence time in the tanks is six hours. The leached slurry, which contains both copper in solution and un-dissolved copper in solids, passes to the high-grade thickener. High-grade thickener – Overflow from the thickener containing copper in solution, mainly as copper sulphate, passes to a high-grade pinned bed clarifier for further upgrading. Slurry underflow from the thickener, which contains copper not yet dissolved, passes to the counter current decantation (CCD) circuit. High-grade pinned bed clarifier – this removes remaining solids and produces a clarified high-grade pregnant leach solution (PLS), which is the feed for the high-grade circuit of the solvent extraction (SX) process. Underflow from the clarifier is recycled back to the thickener. CCD circuit – Slurry underflow from the thickener is pumped sequentially through five CCD thickeners in series. The slurry underflow liquor is diluted with wash liquor that flows in the opposite direction. The wash liquor leaches out most of the remaining copper in solids and forms the low-grade PLS. After clarification in a low-grade pinned bed clarifier, the clarified lowgrade PLS solution provides the feed for the low-grade circuit of the solvent extraction circuit.

Solvent extraction is the method used to purify the copper solution for copper refining. At Kinsevere, there are two SX trains comprising a low-grade circuit (for the low-grade PLS) and a high-grade circuit (for the high-grade PLS). This configuration has the advantage of improving copper recoveries and reducing acid consumption.

The SX process uses mixing and settling tanks to contact the pregnant acidic liquor with an organic solvent. The copper is extracted away from the aqueous phase into the organic phase, leaving most of the impurities behind. The copper bearing organic phase is then contacted with a strongly acidified aqueous solution. This causes the copper to move to the aqueous phase while the organic phase is reconstituted in its hydrogen form. The density difference between the aqueous solution and the organic solvent is used to separate the two solutions after the copper has been transferred. The copper bearing aqueous phase is then advanced to the electrowinning stage, while the organic phase, now devoid of copper, is returned to the extraction stage. The spent impure acid solution or raffinate is recycled back to the SAG mill, leach tank and CCD circuits.

In the EW process, the copper is reduced electrochemically from copper sulphate in solution and is deposited as copper metal onto a stainless steel sheet, which acts as a cathode. Electrowon copper cathodes are as pure as or purer than electrorefined cathodes from traditional smelting processes. Kinsevere has two tank houses. The EW cells run at a very high current density. Kinsevere claims the very high current density used at the refinery is the second highest in the world. Despite the high current density, the current efficiency of 91% does not appear to have fallen. When the copper deposited has achieved the desired weight, a crane is used to remove the copper cathode from the electrolytic cell. The copper is then stripped from the stainless steel cathode in an automated process. The copper cathodes are then bundled and weighed, ready for shipping. A methodical anode and cathode maintenance and cleaning regime is in place to achieve maximum current efficiencies.

There is a heap leach facility, which is now in a dormant stage. Kinsevere may look at some form of heap leach operation for the future, potentially to treat ore from additional sources, particularly lowgrade material.

Kinsevere Expansion Project (KEP)
The KEP study proposes to expand the current acid leach process to treat sulphide, transition and oxide ore, as well as recover cobalt. The Kinsevere processing facility upgrades required for the project are:
– Oxide pre-flotation circuit and leach tank modifications for 2.3 Mtpa ore treated.
– Once Oxide Ore is exhausted, the Oxide grinding circuit is planned to be modified (i.e. Sizer is replaced with a Jaw Crusher while the current mill is modified) to accommodate the processing of Sulphide Ores.
– It has been estimated that this modified oxide circuit will be capable of processing 1.3Mtpa of Sulphide Ore, bringing the total treatment capacity to 3.5Mtpa.
– Oxide leach upgrades to convert to reductive leach conditions.
– Sulphide concentrator for 2.1 Mtpa ore treated.
– The roaster circuit includes off-gas cleaning, acid plants, and concentrate storage.
– Cobalt recovery circuit to produce high-grade cobalt hydroxide.
– Solution Extraction (SX) plant modifications.

Cobalt is produced as a by-product at the Kinsevere mine. This was achieved in October 2023 after successfully commissioning the cobalt plant, which forms part of the Kinsevere Expansion Project (KEP).

Mechanical completion of the sulphide plant as well as first copper cathode production from sulphides was achieved in the third quarter of 2024. However, the cobalt plant was placed in care and maintenance in December 2024 due to unfavourable cobalt market conditions.

In 2025, MMG will focus on ramping up the concentrator and roasting systems, integrating them with the existing solvent extraction and electrowinning plant to reach nameplate capacity. A flexible cobalt production strategy will be implemented going forward, adapting to cobalt prices, market conditions, and varying cobalt content across different mineral sectors.

Water Supply

Summary:

Kinsevere’s dewatering program is managing increasing water volumes with water either used onsite or released after appropriate quality testing. Additional drilling of boreholes in 2022 reinforced capacity and brought the site additional clean water.

Commodity Production

Operational metrics

Personnel

Job Title	Name	Profile	Ref. Date
Engineering and Reliability Superintendent	Unen Ali		May 19, 2025
General Manager	Yi Chen		May 26, 2025
Health, Safety & Training Superintendent	Alpha Mwamba Muteba		May 26, 2025
Maintenance Planner	Flair Mbala		May 19, 2025
Mechanical Superintendent	Augustin Mwamba		May 19, 2025
Process Manager	Jean Bilali Wa Ngalu		May 19, 2025