Major miners BHP and Rio Tinto are deploying bacterial technology to extract copper from disused sites, a shift driven by soaring metal prices. This bioleaching method uses microbes to recover metal from low-grade ore and waste, offering a potential path to new supply without new open pits.

The move reflects a broader industry pivot toward sustainable extraction as high-quality deposits dwindle and environmental scrutiny intensifies. For investors, this represents a strategic hedge against volatile prices and a way to monetize legacy assets. It also signals a growing operational focus on circular economy principles within mining.

The technology’s success could reshape capital allocation, with more funds potentially directed toward innovation rather than greenfield projects. Watch for pilot project results and any formal partnerships that could scale these biological solutions across the sector, potentially altering long-term supply curves for the red metal.