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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
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IPT:AU
Impact Minerals Limited
Investor Insight
With a mining lease application underway and a scoping study that shows excellent economics, Impact Minerals’ game-changing, advanced Lake Hope high-purity alumina project makes for a compelling investment case.
Overview
Impact Minerals (ASX:IPT) is an exploration and development mining company focused on discovering and developing new resource projects within Australia. Lake Hope, a transformational acquisition by the company and its current flagship asset, is a high-purity alumina (HPA) project in Impact’s home territory of Western Australia, a tier-one jurisdiction.
This advanced-stage project allows the company to fast-track the asset toward development, firmly establishing the company on the road to production and increasing shareholder value.
HPA is a high-value product with various uses in several industries that are key to the transition to a low-carbon world. It is mainly used in LED lighting, micro-LED screens, and ceramic-coated separators in lithium-ion batteries. Both these markets are forecast to grow dramatically over the next decade, and a looming supply shortage is predicted for 2026.
HPA is also necessary for producing synthetic sapphire and scratch-resistant glass. With these ever-widening applications for HPA, demand for this resource is expected to grow from US$3.18 billion to US$12.21 billion by 2030 with a compounded annual growth rate of about 20 percent.
Lake Hope is the company’s current focus as it moves towards production, and where a very shallow, high-grade resource of HPA precursor material has been identified in the top two meters of a dry salt lake. The deposit has unique physical and chemical properties that will allow for inexpensive digging and mining, with transportation to a processing facility off-site in an established industrial area. This will accelerate the approvals processes required to get into production.
With a mining lease application pending, Impact aims to bring Lake Hope, which contains almost 1 million tons of potential HPA, into production when the forecast average price for 4N HPA (99.99 percent Al2O3) and related products is about US$20,000 per ton. The ‘4N’ designation indicates the purity grade, making it suitable for high-tech end uses.
Outstanding economics from the latest scoping study released by the company shows Lake Hope’s potential to be the lowest-cost producer of HPA globally by up to 50 percent.
Lake Hope has a maiden mineral resource estimate (MRE) of 3.5 million tons at 25.1 percent alumina (Al2O3) for a contained 880,000 tons of alumina. The company also received heritage clearances for the entire Lake Hope deposit further de-risking the project and providing another critical component in the company’s application for a mining lease.
Impact completed a bulk sampling and test pits program at the Lake Hope project in December 2023, and later reached a key milestone by producing HPA greater than 99.99 percent (4N) purity from the metallurgical processing of lake clays acquired from Lake Hope.
In February 2024, a new proprietary metallurgical process for producing HPA from the lake clays was identified. Impact produced 99.99 percent (4N) Al2O3 from a low-temperature leach (LTL) process. The LTL process may lower the capital and operating costs to produce HPA compared to the sulphate process which underpinned the recent scoping study. The LTL process will be included in the ongoing pre-feasibility study in parallel with the sulphate process at marginal extra cost to determine the best processing route to HPA. The PFS is due to be completed in late 2024.
A comparison of the LTL process and the sulphate process
The company is well funded to finance the pre-feasibility study at the Lake Hope High Purity Alumina project and exploration activities at the Arkun battery minerals project.
Impact Minerals has been awarded a $2.87 million grant for the commercialisation of its innovative process to produce High Purity Alumina (HPA) from the Lake Hope deposit. The grant is under the Federal Government’s Cooperative Research Centres Projects (CRC-P) program which fosters short-term, industry-led research collaborations. The grant is part of an estimated $6.4 million research and development project to be completed within three years and designed to provide Impact with the relevant information required to complete a definitive feasibility. A key component of the grant funding will be to construct a pilot plant, which is a key goal for 2025, and this will provide consistent material for off-take and qualification trials.
Impact Minerals was also one of the inaugural cohort of seven companies selected to be part of the prestigious BHP Xplor program. BHP Xplor, an accelerator program introduced by BHP in August 2022, is designed to help provide participants with the opportunity to accelerate their growth and the potential to establish a long-term partnership with BHP and its global network of partners.
The BHP Xplor funding was used to identify new target areas for copper and other energy metals around the Broken Hill area in New South Wales, eastern Australia, where Impact has been quietly adding to its ground position for several years.
Additionally, the company is exploring its large Arkun battery metals project, also in Western Australia which covers nearly 2,900 square kilometres. Three new exploration licence applications were submitted recently immediately north of the Arkun project along trend from the recently discovered REE soil geochemistry anomalies at Hyperion, Swordfish and Horseshoe, and the Caligula copper anomaly. These anomalies require drill testing which will occur in 2024 and is an exciting development in the emerging mineral province of southwest WA.
A strong management team with over 50 years of combined industry experience leads the company. With a mining and exploration geology degree, Dr. Mike Jones, managing director, launched a long career consulting and leading mining organizations. Peter Unsworth, the non-executive chairman, has more than 35 years of experience in multiple financial sectors, such as securities industries and wealth management. Paul Ingram, a non-executive director, has led several mining companies since 2003. Impact Minerals has the experience and expertise to lead the company to success.
Company Highlights
- Impact Minerals is an exploration and development mining company focused on rapidly moving its flagship Lake Hope high-purity alumina (HPA) project toward production.
- The Lake Hope project has a high-grade maiden mineral resource estimate (MRE) of 3.5 million tonnes at 25.1 percent alumina (Al2O3), for a contained 880,000 tonnes of alumina that can be converted to HPA.
- HPA is used throughout multiple industries, and the overall HPA market is projected to grow by a CAGR of 18.4 percent by 2030.
- A pre-feasibility study is currently in progress and scheduled to be completed by Q4 2024. A mining lease application for the Lake Hope High Purity Alumina (HPA) was recently lodged with the aim of being granted by 2026.
- The company’s project portfolio also includes assets with high-grade mineral deposits of a range of base, critical and precious metals.
- Impact Mineral’s 2,000-square-mile Arkun nickel-copper-PGE project in Western Australia has produced encouraging assays that motivate further exploration. Maiden drill programmes are planned for early 2025.
- The company is also exploring its Broken Hill copper project in New South Wales following a major grant under the auspices of the BHP Xplor program in 2023..
- A strong management team leads the company with experience in geology, mining and corporate finance.
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Developing the lowest-cost HPA project in Australia
