Mintek Develops New Biological Metallurgical Techniques for Low-Grade Ores

What's Happening?

Mintek, a state minerals research institution based in Randburg, South Africa, is advancing biological metallurgical processes to address the challenges posed by declining ore grades in South Africa's mature mines. The institution is focusing on bioleaching, a method that offers low energy intensity and can be conducted at ambient temperatures, making it a cost-effective alternative to traditional methods like milling and smelting. Mintek's research has expanded the application of biological metallurgy beyond copper sulphides and gold ores to include critical raw minerals (CRMs) and rare earth elements (REEs). The institution is also assisting clients in Zambia, the Democratic Republic of Congo, Botswana, and Namibia with minerals processing techniques.

Why It's Important?

The development of biological metallurgical techniques by Mintek is significant as it offers a sustainable and cost-effective solution to the problem of declining ore grades, which are becoming increasingly expensive to process using conventional methods. This advancement could lead to more efficient extraction processes, reducing operational costs and environmental impact. The focus on CRMs and REEs is particularly important as these materials are crucial for various industries, including technology and renewable energy. By improving the extraction of these minerals, Mintek's research could support the global demand for these resources, potentially benefiting economies reliant on mining.

What's Next?

Mintek is undertaking a multi-phase, multi-year project to enhance the biological heap leaching of low-grade chalcopyrite ores, a challenging sulphide mineral to bioleach. The institution is focusing on optimizing heat distribution within heap beds to improve extraction rates. Mintek is also developing new patented technologies, such as the MinBind solution, which creates a scaffold for minerals not amenable to heap leaching. These efforts aim to improve the hydrodynamics and microbial dynamics of the leaching process, potentially leading to more efficient and robust extraction methods.

Beyond the Headlines

The implications of Mintek's research extend beyond immediate economic benefits. The development of biological metallurgical techniques could lead to long-term shifts in mining practices, promoting more sustainable and environmentally friendly methods. This approach aligns with global efforts to reduce the carbon footprint of industrial processes and could set a precedent for other mining institutions worldwide. Additionally, the focus on CRMs and REEs highlights the strategic importance of these materials in the context of technological advancement and energy transition.