Impact Minerals Launches Staged Test Work Programme Targeting ~20kg of Candidate 4N HPA at Lake Hope

Shwetambri Chauhan

09 November 2026 03:33 PM AEDT

Impact Minerals Launches Staged Test Work Programme Targeting ~20kg of Candidate 4N HPA at Lake Hope

Image Source: Krish Capital Pty Ltd

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Impact Minerals (ASX:IPT) has disclosed a staged test work programme for its Lake Hope High Purity Alumina (HPA) project, with the programme targeting approximately 20 kilograms of candidate 4N high purity alumina for independent verification and potential customer evaluation.

Key Points

Coordinated laboratory and pilot-scale test work is under way across the Lake Hope HPA flowsheet
Edith Cowan University (ECU) pilot facility in Joondalup is being constructed under the CRC-P research collaboration
Simulus Group has been engaged for specialist testing involving corrosive reagents and hydrogen chloride gas sparging
Programme targets approximately 20 kg of candidate 4N HPA for independent verification and potential customer evaluation

ECU and Simulus Group Roles in the Lake Hope Flowsheet

The ECU pilot facility, supported by the Australian Government's Cooperative Research Centres Projects (CRC-P) programme, is providing support for mineral processing, leaching and related process development. Simulus Group has been engaged to cover work involving corrosive reagents and hydrogen chloride gas sparging, including leaching, HCl gas handling, aluminium chloride hexahydrate (ACH) crystallisation, solid-liquid separation, thermal decomposition and calcination, and preliminary assessment of off-gas management and recovery, according to the filing.

Programme Objectives Across Key Processing Stages

The test work programme covers several key objectives across the Lake Hope HPA flowsheet. These include quantifying aluminium recovery and losses by stage, tracking impurity deportment and accumulation under recycle conditions, defining leaching conditions and filtration characteristics, establishing operating conditions for HCl gas sparging and ACH washing, and assessing ACH decomposition and alumina calcination with a focus on conversion, product purity and contamination control. The programme will also evaluate recycle scenarios and preliminary off-gas and acid-recovery requirements, the filing states.

Sequential Approach from Batch Testing to Pilot Operations

According to the filing, work will progress from batch optimisation and locked-cycle testing to larger-scale, sequential pilot operations. The test work is described as refining operating envelopes, material balances and design assumptions, and will identify where further testing or alternative equipment may be needed. The filing states the aim is a stronger, evidence-based foundation for the next stage of scale-up, guided by quantified performance and validated design parameters. The release was authorised by Chair Jim McKerlie, who is quoted in the filing commenting on the progress made by the Impact team and its partners at ECU and Simulus.

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