A new gold extraction technology is poised to deliver significant sustainability benefits for the gold mining sector, particularly in regions where environmental and health impacts from traditional extraction methods remain a critical concern. This innovative process, described recently in Nature Sustainability, eliminates the need for highly toxic chemicals such as cyanide and mercury, which are widely used in conventional gold extraction and are major contributors to environmental pollution and public health risks.
Key sustainability benefits of the new technology:
Reduced Toxicity: The process uses trichloroisocyanuric acid—a compound commonly used in water sanitation—activated by a halide catalyst to dissolve gold from ore and electronic waste. This approach avoids the use of cyanide and mercury, drastically reducing the risk of toxic contamination of water, air, and soil.
Selective Recovery and Recyclability: Gold is selectively captured from the leachate using a novel sulfur-rich polymer sorbent. The polymer can be depolymerized after gold recovery, allowing both the gold and the polymer to be recycled and reused, supporting a circular economy model.
Applicability to E-Waste: The method has demonstrated high efficacy in extracting gold from electronic waste, offering a sustainable solution to the rapidly growing e-waste stream. With only 22.3% of global e-waste formally collected and recycled in 2022, this technology could help recover valuable metals while mitigating hazardous waste issues.
Support for Artisanal and Small-Scale Mining: The technology offers a safer alternative for small-scale and artisanal miners, who often rely on mercury for gold amalgamation. Since artisanal mining is responsible for 37% of global mercury pollution, transitioning to this new method could significantly reduce mercury emissions and associated health risks in mining communities.
Lower Environmental Footprint: By eliminating the use of hazardous chemicals and enabling the recycling of both extraction reagents and gold, the process reduces the overall environmental impact of gold mining, including risks to biodiversity, water resources, and human health.
This technology represents a promising step toward greener gold production from both primary (ore) and secondary (waste) resources. Its adoption could help mining operations, especially in sub-Saharan Africa, align with international ESG standards, reduce compliance risks, and unlock new opportunities for sustainable business growth in the mining sector.