Ernest Henry’s processing infrastructure is central to Evolution Mining’s proposed integration of the Greater Duchess project.
By Charles Pitts
Evolution Mining’s proposed $213 million acquisition of Carnaby Resources is moving toward a shareholder vote expected on October 28, with Carnaby’s board unanimously recommending the all-scrip deal.
The transaction would give Evolution full ownership of Carnaby’s Greater Duchess copper-gold project and surrounding exploration tenure in Queensland’s Cloncurry district. Evolution says the project could support approximately 10,000 tonnes per year of additional copper production at its nearby Ernest Henry operation by using existing infrastructure and latent mill capacity.
The scheme meeting date remains subject to court approval and the final scheme booklet. The indicative timetable places the meeting in late October, with implementation targeted for mid-November.
The acquisition is one of several recent moves by Evolution to expand its copper exposure alongside its gold operations. The company has described Greater Duchess as a potential regional growth opportunity that can be integrated with Ernest Henry rather than developed as a standalone operation.
Deal terms and shareholder recommendation
Under the binding scheme implementation deed, Carnaby shareholders will receive 0.0682 new Evolution shares for every Carnaby share held.
The consideration implies a value of approximately A$0.77 per Carnaby share and an equity value of roughly A$213 million. Based on the terms announced by Evolution, the offer represented a 60.4% premium to Carnaby’s closing price on July 24 and a 31.4% premium to its 30-day volume-weighted average price.
Carnaby shareholders are expected to own approximately 0.9% of Evolution after completion. The final ownership position will also reflect the separate share issuance connected to the termination of Carnaby’s existing arrangements with Glencore.
Carnaby’s board has unanimously recommended that shareholders vote in favour of the scheme, provided there is no superior proposal and the independent expert concludes that the transaction is in the best interests of Carnaby shareholders.
Carnaby directors, who collectively hold or control about 7.3% of the company, have also indicated that they intend to vote their shares in favour under the same conditions.
| Key transaction detail | Disclosed position |
|---|---|
| Transaction value | Approximately A$213 million |
| Consideration | 0.0682 Evolution shares per Carnaby share |
| Implied Carnaby offer price | Approximately A$0.77 per share |
| Potential incremental copper production | Approximately 10,000 tonnes per year |
| Greater Duchess mineral resource | 29.2 million tonnes at 1.3% copper and 0.2 g/t gold |
| Greater Duchess ore reserve | 8.4 million tonnes at 1.7% copper and 0.3 g/t gold |
| Expected shareholder meeting | October 28, subject to court and scheme-booklet confirmation |
| Targeted implementation | Mid-November |
Greater Duchess is positioned as an Ernest Henry feed source
Greater Duchess is located approximately 70 kilometres southeast of Mount Isa and close to Evolution’s Ernest Henry operations.
Carnaby’s reported mineral resource stands at 29.2 million tonnes grading 1.3% copper and 0.2 grams per tonne of gold. The project also has an ore reserve of 8.4 million tonnes grading 1.7% copper and 0.3 grams per tonne of gold.
The project is at the pre-feasibility study stage. Carnaby’s March 2026 study contemplated a staged development pathway, but several approvals and the completion of a feasibility study remained outstanding when Evolution agreed to the acquisition.
Greater Duchess is part of the prospective copper-gold terrain surrounding Ernest Henry and Mount Isa.
Evolution intends to complete an updated feasibility study after the transaction is implemented. The study is expected to take between 12 and 18 months and will assess how Greater Duchess can be incorporated into Ernest Henry’s broader life-of-mine plan.
That work is expected to cover:
- An updated geological interpretation and resource model.
- Evolution-compliant mineral resource and ore reserve statements.
- Mining and processing sequencing across Ernest Henry and Greater Duchess.
- Potential operating and capital efficiencies from using existing infrastructure.
- Further infill, step-out and regional exploration drilling.
- Permitting, approvals and the timing of a final investment decision.
The proposed integration could reduce the infrastructure requirements associated with a standalone development. However, the production opportunity remains subject to the updated feasibility study, regulatory approvals, permitting and a final investment decision.
Glencore arrangements to be terminated
The transaction also restructures the commercial arrangements surrounding Greater Duchess.
Carnaby’s existing tolling and offtake agreements with Glencore are being terminated as part of the acquisition process. Carnaby has issued 28.6 million shares to Glencore to settle the termination of those agreements.
Following completion, concentrate produced from Greater Duchess ore is expected to be sold to Glencore under Evolution’s existing Ernest Henry offtake arrangements.
Evolution and Glencore have also entered into a separate agreement covering the toll treatment of third-party ore through Ernest Henry’s processing facility. The arrangement could provide additional utilisation of the concentrator beyond ore sourced from Evolution’s own operations, although the financial and operational impact will depend on the volume and characteristics of third-party material processed.
Existing processing capacity at Ernest Henry is central to the proposed development pathway.
The commercial changes are important because they allow Evolution to bring Greater Duchess into its established Ernest Henry operating and marketing framework. Rather than retaining Carnaby’s previous tolling structure, the combined operation would be managed through Evolution’s infrastructure and offtake relationships.
Approval timetable
The acquisition remains conditional on several approvals and customary transaction requirements.
The key steps include:
- A first court hearing, expected in mid-September.
- Dispatch of the scheme booklet to Carnaby shareholders, expected in mid-to-late September.
- The Carnaby shareholder scheme meeting, expected on October 28.
- A second court hearing, expected in early November.
- Scheme implementation, targeted for mid-November.
The shareholder vote requires the relevant statutory approval thresholds under Australian schemes of arrangement. The transaction also requires regulatory clearance, including from the Australian Competition and Consumer Commission, as well as final court approval.
The timetable may change depending on court availability, regulatory review and the completion of transaction documents. Carnaby shareholders will receive the final meeting details and voting information through the scheme booklet.
Copper growth in a familiar operating district
The acquisition would deepen Evolution’s position in the North West Queensland copper-gold district, where the company already operates Ernest Henry and is advancing the Bert expansion project.
Evolution reported fiscal 2026 production of 66,000 tonnes of copper across its operations, with Ernest Henry contributing a significant portion of the group’s operating cash flow. Adding Greater Duchess would give the company another potential source of copper feed in the same regional processing corridor.
The proximity of the two assets is central to the investment case. Evolution can assess Greater Duchess alongside Ernest Henry’s existing mine plan, concentrator capacity, infrastructure and regional exploration portfolio.
That does not remove the project’s development risks. The updated feasibility study will need to confirm mine design, metallurgy, scheduling, capital requirements and operating costs. Permitting and approvals also remain material conditions before construction or production can proceed.
For Carnaby shareholders, the scheme offers immediate exposure to Evolution’s larger balance sheet and operating platform while preserving an indirect interest in Greater Duchess through Evolution shares. For Evolution, the transaction provides a relatively small corporate acquisition with the potential to add copper production and extend the strategic role of Ernest Henry.
The shareholder vote will be the next major test of the proposal. If approvals are secured, the focus will shift to Evolution’s feasibility work, the integration plan and whether the expected 10,000-tonne annual copper opportunity can be converted into a permitted and financially viable operation.
Sources: Evolution Mining ASX announcement, Evolution Mining, and Mining Outlook. For broader context, see Skillings’ analysis of the copper supply deficit.
