The TSF-4 tailings storage facility at Mimosa platinum mine was constructed through local firm collaboration and under the guidance of SRK Consulting. Completed in May 2022, this substantial project addresses the environmental challenges posed by local conditions and aims for responsible mining through empowerment and technology. Key features include an advanced drainage system, local labor involvement, and a dedicated on-site laboratory to ensure quality assurance.
The construction of the TSF-4 tailings storage facility at Mimosa platinum mine exemplifies the innovative prowess of local firms in Zimbabwe, achieved through collaboration with SRK Consulting. This project, undertaken by the Mimosa Mining Company, owned by Sibanye-Stillwater and Implats, saw the completion of its detailed design by SRK in May 2022, followed by civil works and operational infrastructure scheduled until March 2024.
The TSF-4 is the second-largest tailings storage facility in Zimbabwe, extending 1 km by 1.3 km with a substantial storage capacity tailored for production rates of 466,000 tonnes monthly over a 20-year deposition span. Empowering local companies was central to the client’s strategy, involving Harare-based Forit Contracting and Kumba Resources Zimbabwe. Also, Paterson & Cooke Consulting Engineers contributed mechanical and electrical designs that adhered to the Global Industry Standard on Tailings Management (GISTM) introduced in 2020.
SRK’s engineering expertise facilitated adaptations for local conditions, particularly the management of high talc levels in tailings, necessitating a complex drainage design. SRK’s Robert McNeil emphasized the importance of efficient water removal through a sophisticated drainage system that channels water to low-lying areas through the dam’s foundation.
The drainage components employed a network designed to monitor desaturation efficiency, ensuring a well-drained outer shell. Internal paddocks were incorporated alongside the TSF walls to allow for the settlement of coarser tailings, while finer particles flowed into the main basin for sedimentation, reducing clogging in the drains. This design aids in maintaining a stable phreatic surface and reducing failure risks.
An innovative approach included lining the drains with high-density polyethylene (HDPE), alongside an extensive clay layer. Such dual lining addresses both geochemical requirements and flat site gradients. The project also featured two penstock towers for redundant water discharge systems, allowing maintenance without interrupting operations. Both towers facilitate efficient height management for the TSF.
Kumba Resources Zimbabwe established an on-site laboratory that was crucial for efficient material sampling and quality assurance on the project. Their team of specialists worked continuously during peak phases to ensure timely outcomes and maintain project quality. As emphasized by Robertshaw, the lab team’s dedication led to a notable enhancement in skill levels.
Forit Contracting enhanced its operational capabilities as the project progressed, expanding its earthmoving fleet significantly. Continuous support and scheduling oversight by SRK construction specialists ensured adherence to project timelines and specifications, with dedicated safety personnel overseeing health and safety protocols. This developmental approach fostered a sense of achievement, showcasing the positive local economic impact of the project and reinforcing a commitment to responsible mining practices.
In summary, the construction of the TSF-4 tailings storage facility demonstrates significant local expertise and collaboration, resulting in advanced design and operational strategies tailored to environmental conditions. The emphasis on local empowerment and robust infrastructural planning reflects a commitment to responsible mining. This project illustrates the potential for large-scale investments to positively impact local economies while adhering to industry standards.
Original Source: africanminingmarket.com
