Highlights

• Impact Minerals advances a staged laboratory and pilot-testing programme at its Lake Hope high-purity alumina project.

• Edith Cowan University constructs a pilot Facility under a CRC-P-supported research collaboration.

• Simulus undertakes specialist testing involving corrosive reagents, HCl handling and alumina processing.

• The programme targets approximately 20 kilograms of candidate 4N alumina for independent verification and possible customer assessment.

Lake Hope has moved from individual laboratory investigations into a coordinated programme intended to test how the production process performs as a whole. Impact Minerals Limited (ASX:IPT) is working towards roughly 20 kilograms of candidate 4N high-purity alumina, or HPA, that can be checked independently and potentially offered for customer evaluation. The target is a test-work objective rather than a declaration of commercial production.

Why Are Two Facilities Involved?

The testing programme distributes work between Edith Cowan University and specialist contractor Simulus Group. ECU is constructing a pilot facility in Joondalup as part of a collaboration supported by the Australian Government’s Cooperative Research Centres Projects programme. Its role includes mineral processing, leaching and associated process development. Simulus has been engaged to handle stages that require specialist equipment and expertise with corrosive reagents and hydrogen chloride gas. The split allows each organisation to investigate defined parts of the flowsheet while feeding results into the wider development programme.

What Does the Testing Actually Cover?

Simulus will investigate leaching, HCl gas handling, aluminium chloride hexahydrate crystallisation, solid-liquid separation, thermal decomposition and calcination. The work also includes preliminary assessments of off-gas management and recovery. These activities address linked stages of alumina production rather than a single isolated laboratory result. The aim is to determine operating conditions and document performance as material passes through successive processing steps. Conditions that work in individual experiments still need evaluation when the material is recycled and processes are connected.

How Will the Programme Measure Results?

Initial batch optimisation and locked-cycle tests are planned ahead of larger sequential pilot operations. The measurements include aluminium recovery and losses at each stage, the movement and accumulation of impurities, residue washing and filtration characteristics, and requirements for crystallisation and washing. Thermal tests will examine conversion, purity and contamination control. The programme will also evaluate recycle Options and preliminary acid-recovery requirements. Together, these results are intended to refine material balances, equipment choices and the underlying assumptions used for the next scale-up stage.

What Happens After Candidate Alumina Is Produced?

Approximately 20 kilograms of candidate 4N HPA is the stated output target for independent verification and potential customer evaluation. Testing may identify further work or different equipment requirements before any larger operation is considered. The information gathered is intended to support an evidence-based decision on scale-up, using quantified process performance rather than assuming that laboratory outcomes translate directly into larger facilities. The company has not presented the targeted material as qualified commercial output.

What Comes Next?

The sequence of laboratory measurements, pilot operations and independent checks is intended to show which parts of the Lake Hope process are ready for further development. Recovery, impurity management and recycling will be tested together before decisions about larger equipment are made. The stated 20-kilogram objective provides a specific quantity for verification and possible customer evaluation, but the programme remains focused on generating technical information rather than establishing a production timetable.