Highlights

  • Hillgrove Resources has executed a binding Farm-In Agreement with Havilah Resources giving Hillgrove the right to earn an 80% interest in the Mutooroo Copper Project in South Australia's Curnamona Province, subject to specified conditions including the renewal of Exploration Licence EL 6592.
  • The transaction is structured to enable a pre-feasibility study (PFS) assessing the potential to process Mutooroo's 192,000-tonne copper JORC Sulphide Mineral Resource through Hillgrove's existing Kanmantoo processing Facility — a Capital-efficient pathway that leverages existing infrastructure Investment.
  • Hillgrove will invest up to $10 million in a phased earn-in program over 24 months, including 5,000 metres of resource definition drilling, with the phased structure designed to mitigate material technical and commercial risks before committing to the full PFS expenditure.

 

Hillgrove Resources Limited (ASX:HGO) and Havilah Resources Limited (ASX:HAV) announced on 21 May 2026 the execution of a binding Farm-In Agreement under which Hillgrove has the right to earn an 80% interest in the Mutooroo Copper Project, located in South Australia's Curnamona Province. The commercial logic of this arrangement is straightforward: Hillgrove possesses processing infrastructure — the Kanmantoo facility in South Australia — that is capable of processing copper sulphide ore, while Havilah holds an undeveloped copper resource that could potentially be brought into production at materially lower capital intensity by routing ore to an existing processing plant rather than building new infrastructure.

HGO shares rose 2.38% to A$0.043 on the day of the announcement, a modest positive reaction from a micro-cap resource company that reflects market acknowledgement of the strategic merit of the arrangement without assigning commercial certainty to an outcome that remains subject to pre-feasibility work. The Mutooroo project contains a JORC-compliant Sulphide Mineral Resource Estimate of 192 thousand tonnes (kt) of copper — a resource that, if processed efficiently, could materially transform Hillgrove's production profile beyond its current operating base.

The Mutooroo Resource: Scale and Development Context

The Mutooroo Copper Project is located in the Curnamona Province of South Australia, a geological domain that has historically hosted significant copper and polymetallic mineralisation. The project's JORC Sulphide Mineral Resource of 192kt of contained copper represents a resource of meaningful scale for a company of Hillgrove's Market Capitalisation. Management has indicated that, subject to favourable outcomes from test work and the PFS, Mutooroo has the potential to lift Hillgrove's copper production beyond 20,000 tonnes per annum — a target that, if achieved, would represent a substantial step-change in the company's operational scale.

The project has not previously been progressed to development stage, and a range of technical and logistical questions remain to be answered through the PFS process. Chief among these is the question of whether Mutooroo ore can be transported economically to the Kanmantoo processing facility for treatment. Phase 1 of the earn-in program is specifically focused on rail logistics and metallurgical test work — two workstreams directly targeted at testing the technical and commercial feasibility of this ore-to-mill pathway before committing to the more expensive pre-feasibility study work.

Transaction Structure: Phased, Funded, and Risk-Managed

The Farm-In Agreement is structured to manage execution risk through a deliberate phasing of commitment and expenditure. The initial conditions include a $5 million upfront consideration payable by Hillgrove to Havilah in fully paid ordinary shares, plus one attaching unlisted option per share — an arrangement that aligns the interests of both parties in Hillgrove's Equity value while preserving Hillgrove's cash for operational investment. This consideration is conditional on the renewal of Exploration Licence EL 6592 on terms acceptable to Hillgrove.

The earn-in program itself is divided into two phases. Phase 1 involves approximately $2 million of expenditure focused on rail logistics assessment and metallurgical test work, with a commitment to 5,000 metres of resource definition drilling over a 24-month period. Phase 2 — which covers the balance of the PFS expenditure — is contingent on satisfactory Phase 1 outcomes, effectively creating a go/no-go decision point before the full PFS commitment is made. This phased structure limits downside capital risk while preserving the option to advance the project if the technical work supports a positive commercial outcome.

The Joint Venture and Long-Stop Provisions

Upon making a Final Investment Decision for development, Hillgrove has the option to crystallise its 80% joint venture interest by making a Stage 2 consideration payment of $35 million to Havilah. This payment can be structured as cash (between 30% and 70% of the total at Hillgrove's election) with the balance in Hillgrove shares — providing flexibility in how the capital allocation is structured at the time of development commitment. A Tolling and Marketing Agreement for processing Mutooroo ore at the Kanmantoo facility is currently in draft form and will be finalised following completion of the PFS.

For Havilah, the arrangement provides a path to potentially realising the commercial value of an undeveloped copper resource with minimal capital outlay on its part. The structure ensures Havilah retains a 20% interest in any future production — a carried position through the PFS and into development decision — while receiving both upfront share consideration and a meaningful cash-and-equity payment at the FID stage if Hillgrove elects to proceed.

Copper Market Context and Strategic Significance

The Mutooroo transaction occurs against a backdrop of sustained strategic interest in Australian copper Assets, driven by copper's central role as a critical material in electrification, renewable energy infrastructure, and industrial applications. South Australian copper projects have attracted renewed attention as global Supply chain concerns and elevated copper prices have supported development Economics across the sector. Hillgrove's capital-efficient approach — using existing processing infrastructure to potentially unlock a new copper resource — is well suited to a market environment where capital discipline is rewarded and development risk is carefully managed.

Conclusion

The Hillgrove-Havilah Mutooroo Farm-In Agreement is a logically structured Partnership that offers both companies a path to commercial value creation through the intelligent deployment of existing infrastructure. For Hillgrove, the arrangement provides potential access to a 192kt copper resource and a pathway to materially expanded production at lower capital intensity than a greenfield development would require. The phased earn-in structure appropriately manages technical and commercial risk, ensuring that capital is only committed as key feasibility questions are resolved. The outcome of Phase 1 rail logistics and metallurgical test work will be the critical first indicator of whether the Kanmantoo-Mutooroo processing pathway can deliver on its commercial promise.