The TSF-4 tailings storage facility at Mimosa platinum mine represents a significant local achievement, involving local firms in collaboration with SRK Consulting. Constructed to meet global standards, it addresses unique challenges including high talc content in tailings, while ensuring efficient drainage and safety. The initiative empowers local contractors and underscores the strategic importance of responsible mining practices in Zimbabwe.
The construction of the TSF-4 tailings storage facility at the Mimosa platinum mine in Zimbabwe is a remarkable achievement, showcasing the expertise of local firms working in conjunction with SRK Consulting. This facility, which is the second largest tailings storage facility (TSF) in Zimbabwe, reflects a collaborative effort by the Mimosa Mining Company, owned by Sibanye-Stillwater and Implats, along with dedicated local contractors accredited for their significant role in the project.
SRK Consulting was engaged to finalize the detailed design of TSF-4, which was completed in May 2022. The subsequent phase, projected to last until March 2024, involves civil works and the installation of electrical infrastructure for its operation. SRK partner and principal civil engineer Andrew Robertshaw emphasized the project’s advancements in technology, noting that it spans approximately 1 km by 1.3 km with a significant storage capacity designed to manage a production rate of 466,000 tonnes per month over 20 years.
A key aspect of the project involved the empowerment and inclusion of local companies, such as Forit Contracting and Kumba Resources Zimbabwe, which undertook construction and laboratory services. Paterson & Cooke Consulting Engineers contributed by managing mechanical and electrical design, exemplifying the local involvement in this large-scale project.
The TSF-4 adheres to the Global Industry Standard on Tailings Management (GISTM), necessitating design considerations for high talc levels in the tailings, which can disrupt drainage systems. Robertshaw explained the complexities involved, including potential structural risks due to improper drainage from the dam, which is crucial for maintaining the overall safety of the facility.
SRK corporate consultant Robert McNeil described the sophisticated design required for the drainage system to manage the unique challenges presented by talc, stating, “It was important for us to remove the water in the tailings as quickly as possible.” A series of conduits facilitate this drainage, ensuring effective water management during the tailings deposition process, crucial for proper operations.
The TSF features an intricate drainage network, allowing monitoring of water dissipation at various locations. The internal paddocks are strategically designed to promote the settlement of coarser tailings and create a well-drained outer shell, which is essential in eliminating the risk of clogging at the main drains.
Incorporating best practices, the TSF boasts clay and high-density polyethylene (HDPE) linings to manage the geochemical properties of the site effectively. These unique features enhance durability while addressing the challenges posed by talc and ensure the long-term reliability of the facility.
The design also necessitated attention to potential seepage between TSF-4 and an existing facility, necessitating elaborate monitoring equipment to track water flow. Impala’s investment in two penstock towers enhances redundancy, ensuring operational efficiency even during maintenance periods, reflecting their commitment to sustainable infrastructure management.
The establishment of an on-site laboratory by Kumba Resources Zimbabwe ensures prompt sample testing, which accelerates project timelines while maintaining quality assurance. This laboratory has proven instrumental through its continuous operations during high-demand periods, facilitating significant upskilling of the local workforce throughout the project.
Overall, there was a concerted effort among all parties involved to ensure proper resource management and operational efficiency. SRK’s close collaboration with local contractors highlighted how strategic partnerships can enhance local economic impacts in mining projects, thus exemplifying responsible mining commitments alongside substantial infrastructure development.
The construction of the TSF-4 tailings storage facility at the Mimosa platinum mine is not only a remarkable engineering feat but also illustrates the importance of local expertise and collaboration in mining projects. With careful planning and innovative design, the facility exemplifies best practices in tailings management, ensuring safety and sustainability. The project fosters local empowerment and illustrates responsible mining strategies, setting a benchmark for future developments in the region.
Original Source: africanminingmarket.com
