Abstract
This paper presents the project design and execution for deconstruction of a Tailings Storage Facility (TSF) in Mexico involving the relocation of approximately 145,000 m3 of tailings. This case study provides a real example of staged deconstruction planning and implementation. The absence of as-built drawings and construction records prompted the creation of a “digital twin” of the TSF using data from field investigations for planning and technical evaluation. This model facilitated the recreation of the dam geometry, identification of deconstruction risks and planning a safe staged deconstruction methodology. Relocation of tailings was executed with conventional excavators and 25-ton tandem axle dump trucks fitted with sealed tailgates and fluid tailings discharge outlets to prevent tailings release. During the deconstruction, site engineers continuously monitored the dam performance and worked collaboratively with the TSF owner and contractor to adapt the deconstruction methods to safely remove the tailings as conditions changed with depth. The variations in the tailings conditions from fluid-like to non-fluid-like resulted in a range of tailings relocation rates between 820 m3/day and 1,810 m3/day. Challenges and adaptations during the deconstruction process, including monitoring observations are discussed.
Authors:
Darryl Godley | SRK Consulting, Canada
Gaston Quaglia | SRK Consulting, Canada
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