Maiden Measured Resource for the Lake Hope High Purity Alumina (HPA) Project, WA

Impact Minerals Limited (ASX:IPT) is pleased to announce a substantial and high-grade maiden Measured Resource estimate for its flagship Lake Hope High Purity Alumina (HPA) Project, located about 500 km east of Perth in Western Australia. Impact has the right to earn an 80% interest in Playa One Pty Ltd, owner of the Lake Hope project, via an incorporated joint venture by completing a Pre- Feasibility Study (PFS) currently in progress (Figure 1 and ASX Release 21^st March 2023).

• A maiden Measured Resource of 730,000 tonnes at 25.8% alumina (Al₂O₃) for a contained 189,000 tonnes of alumina has been defined at the Lake Hope HPA Project in Western Australia.
• The Measured Resource supports the first 15 years or more of proposed HPA production from Lake Hope. It will underpin a maiden Probable or Proven Reserve, subject to ongoing mining studies, test work, and economic studies to be completed as part of the Pre-Feasibility Study on Lake Hope.
• Impact aims to bring Lake Hope into production to deliver low-cost, high-margin end products to a rapidly expanding global market. Current prices for benchmark 4N HPA (99.99% Al₂O₃) and related products are more than US$20,000 per tonne.
• The Pre-Feasibility Study will be completed in Q1 2025 after the final reports from various contractors and consultants are received, which are expected in December and January.
• Following an agreement with the Federal government, the first monies from the recent $2.87 million grant for the CRC-P research and development project with CPC Engineering and Edith Cowan University to construct a pilot plant for Lake Hope will be received by the end of November, a few months ahead of schedule. This will accelerate the construction of the pilot plant.

The Measured Resource comprises 730,000 tonnes of lake clay at a grade of 25.8% alumina (aluminium oxide, Al₂O₃) for a contained 189,000 tonnes of alumina (Table A). It is part of a much larger resource that includes Indicated and Inferred Resources within a unique deposit of high-grade alumina hosted in extremely fine-grained evaporite and clay minerals in the top two metres of two small dry salt lakes in the Lake Hope playa system (West Lake and East Lake, Figure 3 and ASX Release March 21^st 2023).

The Measured Resource will underpin a maiden Probable or Proven Reserve Statement for an initial mine life of at least 15 years at the proposed benchmark production rate of 10,000 tonnes per annum of High Purity Alumina. The Reserve Statement is subject to further mining, metallurgical test work and economic studies that are part of the ongoing PFS (ASX Release October 9^th 2024).

The larger resource underpins a potentially much longer mine life of at least 25 years, as reported in the Scoping Study on Lake Hope. The study showed that the project had very robust economics, with an after-tax Net Present Value (NPV₈) of A$1.3 billion and one of the lowest operating costs per tonne of HPA globally (ASX Release November 9^th, 2023). Impact confirms that all material assumptions underpinning the production target and forecast financial information in the Scoping Study continue to apply.

Figure 1. Location of Lake Hope Project E63/2086

The Mineral Resource estimate is shown in Table A and is reported in accordance with the requirements of the JORC Code 2012 by resource consultants H and S Consultants Pty Ltd (HSC) of Brisbane, Queensland. All details relevant to the Resource Estimate are given below and in the JORC Tables 1, 2 and 3 at the end of this report. Drill hole information and assay data have been reported previously (ASX Release 19^th June 2023).

Table A. Lake Hope Alumina Mineral Resources.

About 60% of the Measured Resource lies within West Lake, over which Impact recently pegged a Mining Lease Application (ASX Release August 12^th, 2024). When required, further low-cost push-tube sampling of the lake can significantly increase the size of the measured resource (Figure 2).

Figure 2. Lake Hope showing the push tube sampling method used to drill out the resource and an example of the lake clay from the push tube showing excellent sample recovery.

The alumina block grade distribution for the resources is shown in Figure 2. The grade increases towards the centre of the lakes, offering an opportunity for preferential mining of the higher-grade material in the early stages of any future mine development. Initial geometallurgical studies examining the variability of the mineral assemblages across the lakes have also been completed, and these are being incorporated into the mining schedules being prepared for the PFS.

Figure 2. Percentage (%) Alumina Block Grade Distribution for the Lake Hope Mineral Resources (Drill hole collars are shown as circles.)

The new Mineral Resource Estimate will be incorporated, as per the JORC 2012 Code, into the Pre- Feasibility Study for Lake Hope, which is nearing completion. Final reports from the engineering and design studies, mining schedules, and mining cost estimates, as well as from other contractors and consultants, are awaited. Some of these are expected in mid-December, and accordingly, the PFS is expected to be completed in Q1 2025.

Early Access to the CRC-P Research and Development Grant Funding

Impact recently announced that, in collaboration with CPC Engineering and the Mineral Recovery Research Centre (MRRC) at Edith Cowan University, it had been awarded a $2.87 million grant to commercialise its innovative process for producing High-Purity Alumina from Lake Hope (ASX Release October 22^nd, 2024).

The grant is provided under the Federal Government’s Cooperative Research Centres Projects (CRC-P) program and is part of a more extensive research and development project designed to

provide Impact with the relevant information required to complete a Definitive Feasibility Study. A vital component of the grant funding will be to construct a pilot plant, which is an essential milestone for 2025, and this will provide consistent HPA samples for off-take and qualification trials.

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