Funding and Approvals Pose Key Risks for Cobalt Blue’s Halls Creek Ambitions
Cobalt Blue Holdings has completed a scoping study for its Halls Creek Project in Western Australia, outlining a staged development plan with promising economics and a sustainable power strategy. The project targets near-term copper and zinc production with a modest initial capital outlay.
- 10.5-year project life with staged open-cut and underground mining
- Initial capital expenditure of approximately A$73 million
- Post-tax net present value (NPV) of A$121 million and internal rate of return (IRR) of 21.4%
- Sustainable power via solar photovoltaic and battery storage
- 51% joint venture interest with option to increase to 75%
Project Overview and Development Strategy
Cobalt Blue Holdings Limited (ASX:COB) has announced the completion of a comprehensive scoping study for its Halls Creek Project, located in the Kimberley region of Western Australia. The study outlines a two-stage mining and processing operation targeting copper and zinc production from the Onedin and Sandiego deposits. The initial phase involves open-cut mining at Onedin, employing heap leaching and electrowinning to produce copper metal and zinc sulphate monohydrate. This will be followed by underground mining at Sandiego, with a concentrator plant producing separate copper and zinc concentrates.
The project is designed to deliver near-term cash flows with a relatively modest upfront capital investment of approximately A$73 million, primarily allocated to the Onedin open-cut operation and associated processing facilities. Subsequent development of the Sandiego underground mine and concentrator, estimated at A$149 million, is planned to be funded from operational cash flows, reflecting a staged approach that mitigates initial financial risk.
Economic and Technical Highlights
The scoping study estimates a 10.5-year mine life, with five years of open-cut mining at Onedin followed by 4.5 years of underground mining at Sandiego. Financial modelling projects a post-tax net present value (NPV) of A$121 million at an 8% discount rate and a post-tax internal rate of return (IRR) of 21.4%, indicating a robust investment case. The project benefits from low technical risk by utilising conventional metallurgical processes and proven engineering designs, supported by in-house expertise and testing at the Broken Hill Technology Centre.
Operating costs have been benchmarked against recent Australian projects, with open-cut mining costs estimated at approximately A$4.59 per tonne of combined ore and waste, and underground mining costs at around A$77 per tonne of ore. The processing operations leverage heap leaching for oxide mineralisation and flotation concentrators for sulphide ores, with metal recoveries of 80-90% for copper and 65-80% for zinc.
Sustainability and Infrastructure
A notable feature of the Halls Creek Project is its commitment to sustainability through the integration of a hybrid power system. The operation will be powered primarily by a photovoltaic solar array paired with a lithium iron phosphate battery storage system, supplemented by diesel generators to ensure reliability. This approach aims to reduce the carbon footprint and operational costs, aligning with broader industry trends toward renewable energy adoption in mining.
Water management plans include the use of in-pit water supplemented by bore fields, with a closed-loop system for process water recycling. Tailings from the concentrator will be deposited in the Onedin open pit, avoiding the need for a separate tailings storage facility.
Ownership and Funding Considerations
Cobalt Blue currently holds a 51% interest in the Halls Creek Project under a joint venture with AuKing Mining Limited, with the option to increase its stake to 75% by meeting expenditure milestones. The company intends to fund its share of the project through a combination of equity and debt, leveraging its track record of successful capital raises. However, the announcement cautions that funding availability and terms remain uncertain and could impact shareholder value.
The scoping study is preliminary, with a ±35% accuracy range, and includes a modest proportion of inferred mineral resources, which carry geological uncertainty. Further definitive studies, environmental approvals, and native title negotiations are required before the project can advance to production.
Market Outlook and Strategic Implications
The project’s timing aligns with a positive outlook for copper and zinc markets, driven by demand from traditional industrial sectors and emerging energy transition technologies. Copper’s role in electrification and renewable infrastructure, alongside zinc’s applications in galvanised steel and energy storage, underpin the strategic value of the Halls Creek Project within Cobalt Blue’s portfolio. The company remains focused on its cobalt refinery development while leveraging this diversified asset to enhance resilience against commodity price volatility.
Bottom Line?
As Cobalt Blue advances feasibility studies and funding plans, the Halls Creek Project stands poised to become a cornerstone of its diversified critical minerals strategy.
Questions in the middle?
- How will Cobalt Blue secure the necessary funding to progress beyond the scoping study?
- What are the timelines and potential hurdles for environmental and native title approvals?
- How sensitive is the project’s economics to fluctuations in copper and zinc prices over the next decade?
