Mutooroo project faces execution risk pending PFS and regulatory approvals

Strategic Farm-In Targets Capital Efficient Copper Growth

Hillgrove Resources (ASX:HGO) is positioning itself to significantly boost copper production by earning an 80% stake in the Mutooroo Copper Project, located in South Australia’s Curnamona Province. The farm-in agreement with Havilah Resources (ASX:HAV) hinges on a $10 million pre-feasibility study (PFS) and a 5,000-meter drilling program over 24 months, aiming to process Mutooroo ore through Hillgrove’s existing Kanmantoo facility. This partnership could lift Hillgrove’s copper output beyond 20,000 tonnes annually, a notable step up from its current production profile.

Mutooroo’s high-grade sulphide mineralisation, boasting a JORC Sulphide Mineral Resource Estimate of roughly 192,000 tonnes of copper, 20,000 tonnes of cobalt, and 80,600 ounces of gold, offers a substantial resource base. The project’s proximity; just 16 km from the Transcontinental railway and 60 km from Broken Hill; enables a potentially cost-effective rail haulage to Kanmantoo, which lies within 200 meters of the railway line. This rail logistics advantage is central to the proposed centralised processing hub model, designed to reduce capital intensity and execution risk by leveraging existing infrastructure rather than building a new processing plant from scratch.

Phased Development Approach Mitigates Risk

The transaction is structured in two phases. Stage 1 requires Hillgrove to pay $5 million in shares and options to Havilah, conditional on renewing the key Exploration Licence EL6592. Hillgrove will then fund a phased PFS, starting with a $2 million Phase 1 focusing on rail logistics and metallurgical test work. Only if Phase 1 validates the project’s viability will Phase 2 proceed, involving the balance of PFS expenditure and further drilling. Upon successful completion and regulatory approvals, Stage 2 triggers a $35 million consideration payable in cash and/or shares, at Hillgrove’s discretion, to earn the 80% interest.

This phased approach allows Hillgrove to manage capital deployment prudently, funding the PFS through its existing cash flow and limiting upfront cash outlay for Havilah. The deal also includes a resource expansion payment of up to $5 million if additional copper resources are defined beyond the current JORC estimate within five years.

Leveraging Existing Operations to Unlock Value

Hillgrove’s CEO Bob Fulker emphasised the strategic fit: “Mutooroo’s high-grade sulphide mineralisation, proximity to rail, and favourable logistics align strongly with Hillgrove’s centralised processing hub model.” He highlighted that this model could lower capital intensity and reduce execution risk by utilising the fully permitted Kanmantoo processing plant, which has been ramping up production with a target throughput of 1.7–1.8 million tonnes per annum by mid-2026. The company recently reported record copper output and cash flow improvements, supporting its capacity to fund growth internally.

The Kanmantoo facility’s role as a regional processing hub is a clear extension of Hillgrove’s strategy, which has seen recent successes such as the record copper output and expanded South Australia tenements that underpin its growth ambitions.

Havilah Retains Exposure While Reducing Development Risk

For Havilah, the deal offers a pathway to accelerate Mutooroo’s development with minimal capital outlay and reduced execution risk. As technical director Chris Giles noted, the PFS will assess the economic viability of transporting high-grade 1.53% copper sulphide ore via rail to Kanmantoo, potentially unlocking by-product credits from cobalt and sulphur. Havilah will retain a 20% interest in Mutooroo and maintain upside through its shareholding in Hillgrove, while continuing exploration on surrounding tenements with first right of refusal offered to Hillgrove on future developments.

The partnership’s design to leverage existing infrastructure and operational expertise aims to sidestep the greenfield risks that typically burden standalone copper projects. Both parties acknowledge that the project remains subject to the outcomes of the PFS and regulatory approvals before any final investment decision.

Preliminary Concept Plan and Next Steps

The concept plan involves open-pit and underground mining at Mutooroo, crushing ore onsite, and hauling it by rail to Kanmantoo for grinding and flotation. Potential on-site ore sorting could further reduce transport volumes and costs. Capital requirements focus on mine development, logistics infrastructure, and minor plant modifications, avoiding the need for a new processing facility or tailings storage.

The PFS will rigorously evaluate logistics, metallurgy, geology, mining, infrastructure, sustainability, and financial modelling through a staged gate approach. Early confirmation of rail logistics and metallurgical performance will determine whether the full PFS proceeds, with the goal of delivering a robust development pathway.