Ark Mines Pushes Ahead with Rare Earths and Thorium Recovery Trial
Ark Mines is set to commence a crucial processing trial at its Sandy Mitchell project in Queensland, with the aim of recovering valuable thorium and rare earth elements (REEs) from monazite ore. This initiative marks a significant step towards de-risking downstream development and solidifying the project’s processing readiness. The move comes at a strategic moment, as Western governments increasingly prioritise securing robust and independent supply chains for critical minerals.
The company has inked an agreement with an established processing technology provider, signalling a collaborative approach to evaluating the efficiency of existing low-cost cracking technologies for extracting these valuable commodities. This Memorandum of Understanding (MoU) lays out a clear framework for a series of work packages, commencing with the initial cracking of monazite ore and progressing through to the production of various rare earth oxides and refined thorium.
Ben Emery, Ark Mines’ managing director, highlighted the unique position of the Sandy Mitchell Project within Australia’s rare earths landscape. “This MoU will enable Ark to assess a processing pathway for recovering REEs and thorium,” he stated, underscoring the project’s potential to contribute to the burgeoning critical minerals sector.
Key Objectives of the Processing Trial
The trial program is meticulously designed to address key aspects of the recovery process, with a focus on thorium, neodymium, and praseodymium in its initial phase. This foundational stage is critical for refining the chemical analysis and separation chemistry required for all three target materials. The program will explore up to three distinct chemical process variations for each element, allowing for a thorough evaluation of optimal extraction methods.
Success in this initial small-scale program will pave the way for an advancement to a scaled pilot plant. This progression is contingent on the successful outcomes of the preliminary testwork. The ultimate goal of this comprehensive work is to validate the downstream processing capabilities and to foster engagement with potential end-users and offtake partners, thereby building a clear pathway to market.
Strategic Importance of Recovered Minerals
The minerals Ark Mines aims to recover – thorium, neodymium, and praseodymium – are of paramount strategic importance. Their roles are expanding significantly in areas vital to global energy security, advanced manufacturing, and defence capabilities.
- Neodymium and Praseodymium: These elements are indispensable components in the creation of high-performance permanent magnets. These magnets are fundamental to the operation of a wide array of modern technologies, including the efficient generators in wind turbines, the electric motors powering electric vehicles, and the sophisticated systems found in advanced military applications.
- Thorium: While not yet widely used, thorium is garnering considerable attention for its potential as a future nuclear fuel source. Its abundance and unique properties present an intriguing prospect for next-generation energy solutions.
Emery emphasised the timing of this development, noting, “This MoU has been executed at a pivotal time for the rare earths and critical minerals sector, with western governments and the mining industry focused on securing new, credible supply chains.” He added, “Subject to the successful outcomes of this trial and other activities we are running in parallel, the Sandy Mitchell project is well positioned to contribute to the future supply of these strategic metals.”
Parallel Development and Project Outlook
Ark Mines is pursuing a multi-pronged strategy to advance the Sandy Mitchell project. Alongside the rare earths and thorium recovery trial, the company is also engaged in a commercial-scale processing trial with Currumbin Minerals, a privately owned producer of heavy mineral sands. This parallel effort aims to further refine processing techniques and enhance operational efficiencies.
Furthermore, a pre-feasibility study is underway to meticulously assess the economic viability of bringing Sandy Mitchell into production. This study will provide critical data to inform investment decisions and strategic planning. The results from a recently concluded resource expansion drilling program are also anticipated shortly, which are expected to provide further insights into the project’s substantial mineral endowment.
Currently, the Sandy Mitchell project boasts a significant resource estimate, totalling approximately 71.8 million tonnes, grading at 1733 parts per million monazite equivalent. This considerable resource base underpins the project’s potential to become a key contributor to the global supply of critical minerals.
