In a global landscape defined by the relentless race for green energy and high-tech sovereignty, Rare Earth Elements (REEs) remain the quiet, fundamental engines of the modern world. These elements are essential to the manufacturing of high-efficiency wind turbines, high-performance magnets, and the sophisticated microelectronics that power our daily lives. As the global economy shifts toward renewable energy and aggressive decarbonisation, the demand for these minerals has reached an all-time high, creating a strategic imperative for nations to secure their own supply chains.
Currently, China dominates the global landscape, yet industry analysts project a vital window for emerging producers to establish alternative hubs. South Africa is now positioning itself to seize this moment through the National Critical Minerals and Metals Strategy. This ambitious framework aims to transform the country from a traditional raw material exporter into a sophisticated global leader in mineral beneficiation and advanced manufacturing. At the heart of this national mission is Mintek, South Africa’s national mineral research organisation, which is currently spearheading breakthrough research to recover REEs from a remarkably unconventional source: the country’s vast and historically ignored reserves of discard coal and coal fly ash (CFA).
Coal waste and fly ash contain a treasure trove of critical minerals, including rare earth elements, vanadium, titanium, silica, alumina, gallium, and germanium. Despite their name, these elements are relatively abundant in nature, though they are rarely found in the concentrated, easy-to-mine deposits that industry prefers. They are the hidden architects of the digital age, found in the vibrant red phosphors of smartphone screens, the tiny haptic motors that provide tactile feedback in handheld devices, and the massive, high-performance magnets required to generate power in offshore wind farms. Even the precision glass used in high-end camera lenses and the fibre-optic cables that carry the world’s data rely on Lanthanum to transmit light without distortion.
Historically, the dream of extracting these vital materials from coal waste was stifled by a significant technical hurdle involving silica dissolution. During traditional processing of discard coal, silica often leaches into the solution, causing significant losses of REEs and creating a thick, gelatinous substance that clogs downstream machinery and halts production. To bypass this obstacle, Mintek’s Hydrometallurgy division has turned its focus toward Coal Fly Ash, the fine powder left over after coal combustion. By applying the sophisticated principles of the circular economy, Mintek aims to extract a diverse “basket” of critical mineral value that includes REEs for high-tech applications alongside silica, iron, and mullite for broader industrial use. This integrated approach directly supports the South African Government’s strategy by fostering local beneficiation, ensuring that the nation does not simply extract resources but processes them into high-value components.
Dr Molefi Motuku, CEO of Mintek, describes this venture not as a simple extraction project, but as a fundamental reimagining of a key national mineral: “At Mintek, we are fundamentally reimagining the role of coal in the modern era by looking far beyond its traditional use as a primary energy source. We no longer see coal and its by-products as mere fuel or waste, but rather as a strategic reservoir of the very minerals that will power the global high-tech future. By pioneering the extraction of Rare Earth Elements and other critical metals from coal fly ash, we are unlocking a hidden treasure trove that has the potential to anchor a new era of industrial growth.”
This vision recently earned the critical backing of Coaltech, which approved a compelling funding proposal from the Mintek Hydrometallurgy team. Dr Elmar Muller, Executive Manager of Hydrometallurgy, noted that securing this funding serves as a profound testament to the industry’s trust in Mintek’s ability to solve complex, real-world challenges. He believes this partnership reinforces a national commitment to critical materials recovery and showcases how cross-sector collaboration can drive the South African minerals sector into a more competitive and resilient global position.
For Engineer and Project Lead Agnes Modiga, the stakes of this research are as much about people as they are about pixels and magnets. She emphasises that the project possesses the unique power to transform environmental liabilities into invaluable products while simultaneously reducing dust emissions and land contamination for local communities living near coal sites. Beyond the immediate benefits of environmental stewardship, the initiative is designed to not only create new, specialised jobs and bridge a critical skills gap in the engineering sector, but also to stimulate local manufacturing, drive industrial diversification, and create sustainable jobs across multiple sectors – turning what was once seen as waste into an enabler of economic growth. Ultimately, this work is about more than just chemistry; it is about positioning South Africa as a global pioneer in the sustainable utilisation of coal-related materials, proving that the waste of the past can indeed power the innovations of the future.
