Leigh Creek copper mine in South Australia’s Northern Flinders Ranges.
Strategic Minerals has signed a definitive agreement to sell its Leigh Creek Copper Mine in South Australia to South Pacific Mineral Investments Pty Ltd, trading as Cuprum Metals, in a transaction combining cash, shares, royalties and future production payments.
The agreement transfers 100% of Leigh Creek Copper Mine Pty Ltd to Cuprum, subject to conditions including approval from the Australian Foreign Investment Review Board, according to a company announcement. UK Investor Magazine also reported the agreement, which follows Cuprum’s earlier exercise of an option to acquire the project.
The final terms include A$750,000 in cash, up to A$3 million in Cuprum-related shares and a 2% net smelter return royalty on the first 24,900 tonnes of copper produced from Leigh Creek.
Strategic Minerals said the structure reduces its direct ownership and funding obligations at the South Australian project while retaining exposure to future copper production and project cash flow.
Deal terms include cash, equity and royalties
Of the A$750,000 cash consideration, A$500,000 has been placed in escrow pending FIRB approval and completion of the sale. Strategic Minerals previously received A$100,000 as a deposit in June 2025 and A$150,000 when Cuprum exercised the call option in December 2025.
The equity component is expected to comprise shares in a new company intended to be listed on a recognized stock exchange. The shares are expected to represent up to 19.9% of that company’s ordinary share capital, with a target value of A$3 million.
Under the agreement, if the shares are not issued within three years of completion, or if their value is below A$3 million, the shortfall will be added to the earn-out payments, according to the company’s announcement published through Investegate.
Strategic Minerals will also receive a 2% net smelter return royalty on the first 24,900 tonnes of copper produced from Leigh Creek. Cuprum has an option to buy out 1% of that royalty for A$1.5 million.
A further earn-out is payable once commercial production begins. The earn-out is set at 20% of half-yearly operating cash flow, up to a maximum of A$4 million.
Leigh Creek transaction at a glance
| Component | Agreed term |
|---|---|
| Cash consideration | A$750,000 |
| Cash held in escrow | A$500,000 |
| Share consideration | Up to A$3 million |
| Equity exposure | Up to 19.9% of ordinary share capital |
| Net smelter return royalty | 2% on first 24,900 tonnes of copper |
| Royalty buyout option | 1% for A$1.5 million |
| Production earn-out | 20% of half-yearly operating cash flow |
| Earn-out cap | A$4 million |
| Key outstanding condition | FIRB approval |
The layered structure means the transaction value will depend partly on the future performance of the project and the value and timing of the proposed share issuance. The company has previously described the potential total consideration as being about A$9 million when cash, equity and earn-out payments are combined.
Strategic Minerals to redirect proceeds to Redmoor
Strategic Minerals Executive Director Mark Burnett said the sale would allow the company to focus its portfolio on core assets while retaining exposure to Leigh Creek through the equity, royalty and earn-out components.
“We are delighted to have reached final terms for the sale of LCCM, a significant milestone that allows us to continue rationalising Strategic Minerals’ portfolio around our core assets for maximum value creation,” Burnett said in the announcement.
He said proceeds from the transaction would support the company’s Redmoor Tungsten-Tin-Copper Project in southeast Cornwall.
Strategic Minerals acquired Cornwall Resources and the Redmoor project in 2019. The company reported a JORC-compliant inferred mineral resource estimate for Redmoor in March comprising 17.4 million tonnes, with tungsten, tin, copper and silver components.
The decision to redirect proceeds from Leigh Creek to Redmoor reflects a portfolio strategy focused on consolidating capital and management attention around the Cornwall project. It also leaves Strategic Minerals with continued indirect exposure to copper through the Leigh Creek transaction.
The sale follows other efforts by Strategic Minerals to streamline its asset base. The company continues to operate the Cobre magnetite project in New Mexico through its Southern Minerals Group subsidiary, while advancing Redmoor in the United Kingdom.
Cuprum targets a staged brownfield restart
For Cuprum, the agreement provides control of the asset and a platform for potential recommissioning.
Cuprum Director Matthew Salthouse said taking full ownership of Leigh Creek would provide greater certainty for project funding and restart planning.
“Taking 100% ownership and control of LCCM is a key milestone event for Cuprum and gives certainty towards developing a strong platform to advance project funding and recommissioning initiatives,” Salthouse said.
Cuprum describes Leigh Creek as a brownfield copper project with prior production, multiple historically reported JORC-compliant oxide copper resources, existing mining licenses and an approved Program for Environmental Protection and Rehabilitation.
The project is located about 500 kilometers north of Adelaide in the Northern Flinders Ranges. The site includes legacy heap-leach infrastructure and copper recovery equipment, including Kennecott cone reactors and the Mountain of Light processing plant.
Existing processing infrastructure is expected to support Cuprum’s proposed restart strategy.
According to information published by Cuprum Metals, the company plans to use heap leaching to produce cement copper. Its initial objective is to produce 100 tonnes of cement copper per month before reaching a targeted steady-state rate of 300 tonnes per month within 12 months, subject to funding, technical validation, refurbishment and regulatory sequencing.
The company has said the Mountain of Light plant includes filter presses, a generator set and laboratory facilities. It also says some refurbishment and optimization will be required before operations can be re-established.
Those plans remain subject to execution. The definitive sale agreement does not itself establish a production date, and Cuprum will need to complete financing, engineering and operational work before commercial output can begin.
Brownfield advantages and restart risks
The transaction places the Leigh Creek project within a broader mining market that has renewed interest in brownfield assets, particularly where existing permits and infrastructure can reduce development timelines.
Existing facilities can lower initial capital requirements compared with a new-build mine. An approved environmental and rehabilitation framework may also simplify parts of the regulatory process. However, legacy infrastructure can require substantial inspection, repair and replacement before it can support reliable production.
The project’s restart case will depend on several factors:
- the condition and capacity of the heap-leach pads and recovery plant;
- confirmation of the mineral resource and oxide ore characteristics;
- funding for refurbishment, mining and working capital;
- permitting and stakeholder engagement;
- copper recovery rates and operating costs; and
- the availability of commercially acceptable offtake arrangements.
The Leigh Creek district contains historic copper workings and multiple brownfield deposits.
Cuprum has positioned Leigh Creek as the first stage of a wider regional strategy. The company says the project sits within a copper-rich district containing multiple deposits, historical data and exploration opportunities. Any expansion beyond the initial restart would depend on operating results, additional funding and technical studies.
For Strategic Minerals, the royalty and earn-out create a different risk profile from direct ownership. The company will not be responsible for the capital required to restart Leigh Creek, but a larger portion of the transaction’s potential value is contingent on Cuprum achieving production and generating operating cash flow.
Completion remains subject to approvals
The definitive agreement is not yet the same as completed ownership transfer. FIRB approval and other completion conditions remain outstanding.
Until completion, Strategic Minerals retains responsibility for the Leigh Creek subsidiary under the existing ownership structure. After completion, Cuprum is expected to take control of the project and lead funding, refurbishment and recommissioning activities.
The transaction therefore creates two immediate milestones for stakeholders: completion of the sale and evidence that Cuprum can finance and execute the proposed restart.
The deal also illustrates how smaller copper projects are being structured in a market where developers and owners are seeking exposure to future prices without carrying all of the capital burden themselves. Rather than a single fixed cash payment, the Leigh Creek agreement links part of the consideration to equity value, copper production and operating performance.
For more context on the copper market and transaction structures, see Skillings’ copper consolidation analysis and its copper price outlook.
Oxide copper mineralization is present in historic Leigh Creek workings.
Source: Strategic Minerals company announcement via Investegate; coverage by Mining Weekly; Cuprum Metals project information.
