Sánchez, K & Parra Arroyo, V 2026, 'Deposition planning, spigoting, and pond management for the closure of a thickened tailings facility', in AB Fourie, M Horta, M Oliveira & S Wilson (eds), Paste 2026: Proceedings of the 28th International Conference on Paste, Thickened and Filtered Tailings, Australian Centre for Geomechanics, Perth, pp. 1-9, https://doi.org/10.36487/ACG_repo/2655_45
(https://papers.acg.uwa.edu.au/p/2655_45_Sanchez/)
Abstract: One of the most critical phases in the lifecycle of a tailings storage facility is the transition to closure. Effective closure planning requires early integration of operational strategies with closure objectives, ensuring continuity between the end of deposition and the initiation of closure activities. In thickened tailings facilities, spigoting remains the primary method for tailings discharge. In this case, the spigoting strategy has been optimised to shape the final tailings surface in accordance with the approved closure design. This has significantly reduced the need for extensive earthworks during the closure phase, aligning deposition practices with long-term landform requirements. Additionally, a comprehensive review of existing instrumentation networks and their interaction with tailings distribution infrastructure has been essential. This integrated approach to deposition planning, spigoting management, and instrumentation control has proven fundamental for achieving a stable, compliant, and cost-effective closure.

Keywords: tailings storage facility, thickened tailings, mine closure, co-disposal, surface water management, integrated closure planning