Mintek Develops Biological Metallurgical Processes to Address Declining Ore Grades

What's Happening?

Mintek, a state minerals research institution based in Randburg, South Africa, is advancing biological metallurgical processes to tackle the challenge of declining ore grades in the country's mature mines. As traditional methods like milling, crushing, and smelting become cost-prohibitive, Mintek is focusing on bioleaching, which offers low energy intensity and can operate at ambient temperatures. This approach is particularly relevant for processing copper sulphides and gold ores, and Mintek's research has expanded to include critical raw minerals and rare earth elements. The institution is also working on improving biological heap leaching of low-grade chalcopyrite ores, a difficult sulphide mineral to bioleach, by optimizing heat distribution within heap beds.

Why It's Important?

The development of biological metallurgical processes by Mintek is significant as it offers a cost-effective and energy-efficient alternative to traditional ore processing methods. This innovation is crucial for the mining industry, especially in regions with declining ore grades, as it can enhance mineral extraction rates and reduce operational costs. The focus on critical raw minerals and rare earth elements also aligns with global demand for these resources, which are essential for various industries, including technology and renewable energy. Mintek's advancements could potentially benefit not only South African mines but also those in neighboring countries like Zambia, the Democratic Republic of Congo, Botswana, and Namibia.

What's Next?

Mintek is undertaking a multi-phase, multi-year project to improve biological heap leaching techniques, with a focus on maintaining and adapting microorganisms involved in the process. The institution is also developing new patented technologies, such as the MinBind solution, which enhances mineral distribution within heap beds. These efforts are expected to lead to higher extraction rates and more efficient processing of low-grade ores. As Mintek continues its research and development, the mining industry may see broader adoption of biological metallurgy, potentially transforming mineral processing practices globally.