Full definition
Tailings are the residual materials left after the extraction of valuable minerals from ore in a processing plant. The composition of tailings typically includes finely ground gangue, such as quartz and silicates, which are suspended in process water that may contain residual chemical reagents used during the mineral extraction process. This mixture forms a slurry that is often transported to tailings storage facilities (TSFs) for disposal. The management of tailings is a critical component of mining operations, as improper handling can lead to significant environmental impacts, including water contamination and soil degradation. Therefore, specialized techniques are employed to ensure the geotechnical stability of TSFs, control seepage, and enable effective closure and rehabilitation of the sites once mining operations cease.
In recent years, the mining industry has shifted towards the use of filtered or thickened (paste) tailings to mitigate the risks associated with traditional tailings storage methods, including dam breaches. These methods significantly reduce the volume of water in tailings, making them less prone to liquefaction and more stable over time. The paste tailings can be placed in a more compact form, which decreases the footprint of the storage area and minimizes the environmental footprint. As regulations tighten and environmental concerns grow, adopting these innovative technologies is becoming essential for sustainable mining practices.
The design and operation of TSFs must comply with international standards and local regulations to ensure safety and environmental protection. Examples of applicable standards include the International Council on Mining and Metals (ICMM) guidelines and various national regulations that focus on the safe management of tailings. In addition, continuous monitoring and management of TSFs are critical to prevent catastrophic failures, which can have devastating impacts on local communities and ecosystems.