Impact Minerals

Key Milestone of 99.99% (4N) High Purity Alumina (HPA) Achieved at the Lake Hope Project, WA

High Purity Alumina (HPA) at greater than 99.99% (4N) purity has been produced from the metallurgical processing of lake clays from Impact Minerals Limited’s (ASX:IPT) Lake Hope Project, located 500 km east of Perth in Western Australia (Figure 1). Impact can earn an 80% interest in Playa One Pty Limited, which owns the Lake Hope project, by completing a Pre-Feasibility Study (PFS) on the project which is in progress (ASX Release March 21st 2023 and November 9th 2023).


  • Better than 99.99% (4N+) High Purity Alumina (Al2O3) produced from Lake Hope mud via the proprietary and patented Playa One Sulphate Process.
  • The Sulphate Process underpins the recent Scoping Study, which demonstrated an NPV8 of A$1.3 billion for the project and an estimated operating cost to produce 4N HPA up to 50% lower than anyone else globally at less than US$4,000 per tonne.
  • Production of larger quantities of HPA can now commence using the now-optimized Sulphate Process to demonstrate consistent quality to potential customers.
  • Preliminary discussions with potential customers indicate very strong demand for 4N HPA.
  • Other possible process routes to produce HPA from Lake Hope may be possible, with initial results due shortly.
  • The Pre-Feasibility is on schedule to be completed in late 2024.
Impact Minerals Limited’s Managing Director, Dr Mike Jones, said, “The production of 4N HPA is a major milestone and exciting result for Impact and its shareholders as we have now shown that we can produce this high-value product, which commands prices of US$20,000 per tonne or more, from the mud in the top two metres of Lake Hope. It underpins the results of the Scoping Study, which showed an NPV8 of A$1.3 billion for the project and, at less than US$4,000 per tonne, possibly the lowest cost of production of HPA globally by a significant margin of up to 50%.

We have also optimized the Playa One Sulphate Process and have already started batch production of HPA to demonstrate consistent quality to our potential customers. We have discovered from our marketing that there is very strong demand for this high-value product, so we will continue progressing the Pre-Feasibility Study as quickly as possible. In addition, we recently uncovered two other possible process routes to produce HPA from these remarkable clays, which may offer yet further reductions in operating cost and capital expenditure if our initial test work is positive, and we are looking forward to getting those results soon,” Dr Jones said.

The 4N HPA was produced via a proprietary and patented metallurgical process called the ‘Sulphate Process’ which is owned by Playa One. The replication and optimization of this process for Lake Hope has been the key focus of Impact’s Pre-Feasibility Study to date, and therefore, these new results are a key milestone in the development of the project (ASX Releases March 21st 2023 and October 18th 2023).

The clays at Lake Hope occur in the top two metres of two small salt lakes on E63/2086 in a deposit containing about 880,000 tonnes of alumina (Al2O3) in various minerals. The deposit comprises Indicated (88%) and Inferred Resources (12%) of 3.5 million tonnes at an average grade of 25.1% alumina (see the Resource Estimate below and ASX Release 19th June 2023).

The lake clays contain a unique combination of naturally extremely fine-grained minerals, which delivers significant cost advantages to the mining and processing of the ore to produce HPA. The clays are free- digging and require no crushing, screening or other on-site preparation, and it is envisaged that the clay will be trucked offsite to a pre-permitted industrial site, most likely either in Kalgoorlie or Perth (Figure 1 and ASX Release March 21st 2023 and November 9th 2023).

Figure 1. Location of the Lake Hope Project.

The Playa One Sulphate Process is straightforward and comprises five stages based around very modest amounts of sulphuric acid (Figure 2): Stage 1 Wash circuit, Stage 2 Sulphuric acid leach and roast circuit, Stage 3 Intermediate alumina salt production, Stage 4 purification by conventional hydrochloric acid gas sparging and Stage 5 calcining to produce HPA. Results from the optimization of the first three Stages of the Process were reported to the ASX on October 18th 2023.


Click here for the full ASX Release

This article includes content from Impact Minerals, licensed for the purpose of publishing on Investing News Australia. This article does not constitute financial product advice. It is your responsibility to perform proper due diligence before acting upon any information provided here. Please refer to our full disclaimer here.

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This press release includes certain statements and information that may constitute forward-looking information within the meaning of applicable Canadian securities laws. All statements in this news release, other than statements of historical facts, including statements regarding future estimates, plans, objectives, timing, assumptions or expectations of future performance, including without limitation, statements regarding the completion of the Offering and the timing thereof, and the anticipated use of proceeds of the Offering are forward-looking statements and contain forward-looking information. Generally, forward-looking statements and information can be identified by the use of forward-looking terminology such as "intends" or "anticipates," or variations of such words and phrases or statements that certain actions, events or results "may," "could," "should" or "would" or occur. Forward-looking statements are based on certain material assumptions and analyses made by the Company and the opinions and estimates of management as of the date of this press release, including, but not limited to, that the Company will complete the Offering on the terms disclosed, that the Company will receive all necessary regulatory approvals for the Offering, that the Company will use the proceeds of the Offering as currently anticipated; and assumptions relating to the state of the financial markets for the Company's securities. These forward-looking statements are subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of activity, performance or achievements of the Company to be materially different from those expressed or implied by such forward-looking statements or forward-looking information. Important factors that may cause actual results to vary, include, without limitation, that the Company may not be able to raise funds under the Offering, as currently anticipated, that the Company may fail to receive any required regulatory approvals for the Offering, that the Company will not use the proceeds of the Offering as anticipated, market volatility, unanticipated costs, changes in applicable regulations, and changes in the Company's business plans. Although management of the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking statements or forward-looking information, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements and forward-looking information. Readers are cautioned that reliance on such information may not be appropriate for other purposes. The Company does not undertake to update any forward-looking statement, forward-looking information or financial outlook that are incorporated by reference herein, except in accordance with applicable securities laws. The Canadian Securities Exchange (CSE) has not reviewed, approved, or disapproved the contents of this press release.

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