Modelling for the selection of remediation strategies for TSF
| Reference number | |
| Coordinator | Luleå tekniska universitet - Avdelningen för geoteknik |
| Funding from Vinnova | SEK 500 000 |
| Project duration | April 2020 - November 2020 |
| Status | Completed |
| Venture | The strategic innovation programme for Swedish mining and metal producing industry - SIP Swedish Mining Innovation |
| Call | Towards a sustainable development in the mining and metal extraction industry |
Purpose and goal
The aim of the study was to develop a strategy to design multilayer covers for tailings storage facilities, based on numerical modelling. The model showed that the success of the method depends mainly on the properties of the soil used in the cover (hydraulic conductivity, water retention capacity) and the cover design (thickness, density). The hydrological conditions (precipitation, evaporation) had less effect. An accurate estimate of transfer properties is crucial for the outcome of the model. Both laboratory and field results are necessary to validate the model.
Expected results and effects
The main result of the training and the work performed were an assessment of which material parameters and cover design that are controlling the function of the cover system. The model allow to test alternative scenario and design cover with best chance to meet the requirements. The sensitivity analysis showed that the outcome of the model is largely influenced by input parameters i.e. hydraulic conductivity and water retention capacity. It is therefore important to validate the model with laboratory and field data to confirm the results.
Planned approach and implementation
The training of two PhD-students by EPM was done through video conference system due to travel restriction. The selection of conceptual remediation scenarios was done in cooperation with the mining company, taking into account the requirements at Kittilä mine, i.e. the shape of TSF, the available material and the tailings. Material was sampled by Agnico Eagle and sent to LTU for characterization. As visit were impossible, all communication has been virtually. It allowed completing the project in a satisfactory way even though the experience from a stay at EPM was not possible.