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Simulating the effect of climate change on performance of a monolayer cover combined with an elevated water table placed on acid-generating mine tailings

Publication: Canadian Geotechnical Journal
16 July 2021

Abstract

Several reclamation approaches were developed in the last decades to control acid mine drainage from tailings storage facilities, including the monolayer cover combined with an elevated water table. Its performance is dependent on water table elevation and tailings saturation and is directly affected by climatic conditions; therefore, climate change needs to be taken into account to design resilient reclamation systems. The objective of this research was to evaluate three approaches to simulate climate change and compare the impact on reclamation performance up to year 2100. Numerical simulations were calibrated using experimental field data, and future weather conditions were established based on three climate change scenarios adapted for local conditions. Results showed that the projected impact of climate change varied depending on the approach used. Simpler and more conservative approaches indicated that reclamation would eventually fail following an increase of droughts during future summers. However, 80 year simulations showed that reclamation failures (evaluated as oxygen flux) could be limited to a few isolated summers and that a well-designed monolayer cover with elevated water table appeared to remain efficient in the long term. Overall, the probability to exceed the oxygen flux target of 1 mol/m2/year did not exceed 2% for the simulated conditions.

Résumé

Au cours des dernières décennies, plusieurs approches de remise en état ont été élaborées pour contrôler le drainage minier acide des installations de stockage des résidus, notamment la couverture monocouche combinée à une nappe phréatique élevée. Ses performances dépendent de l’élévation de la nappe phréatique et de la saturation des résidus, et sont directement affectées par les conditions climatiques. Il faut donc tenir compte du changement climatique pour concevoir des systèmes de remise en état résilients. L’objectif de cette recherche était d’évaluer trois approches pour simuler le changement climatique et de comparer l’impact sur les performances de remise en état jusqu’en 2100. Les simulations numériques ont été calibrées à l’aide de données expérimentales de terrain et les conditions météorologiques futures ont été établies sur la base de trois scénarios de changement climatique adaptés aux conditions locales. Les résultats ont montré que l’impact prévu du changement climatique varie selon l’approche utilisée. Des approches plus simples et plus conservatrices indiquaient que la remise en état échouerait finalement à la suite d’une augmentation des sécheresses au cours des étés futurs. En revanche, des simulations sur 80 ans ont montré que les échecs de la remise en état (évalués par le flux d’oxygène) pouvaient être limités à quelques étés isolés et qu’une couverture monocouche bien conçue avec une nappe phréatique élevée semblait rester efficace à long terme. Globalement, la probabilité de dépasser l’objectif de flux d’oxygène de 1 mol/m2/an n’a pas dépassé 2 % pour les conditions simulées. [Traduit par la Rédaction]

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Information & Authors

Information

Published In

cover image Canadian Geotechnical Journal
Canadian Geotechnical Journal
Volume 59Number 4April 2022
Pages: 558 - 568

History

Received: 9 October 2020
Accepted: 26 May 2021
Accepted manuscript online: 16 July 2021
Version of record online: 16 July 2021

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Key Words

  1. acid mine drainage
  2. mine site reclamation
  3. climate change
  4. elevated water table
  5. monolayer cover
  6. numerical simulations

Mots-clés

  1. drainage minier acide
  2. remise en état des sites miniers
  3. changement climatique
  4. nappe phréatique élevée
  5. couverture monocouche
  6. simulations numériques

Authors

Affiliations

Elodie Lieber*
University of Québec in Abitibi-Témiscamingue (UQAT), Rouyn-Noranda, Quebec, Canada.
Research Institute of Mines and Environment (RIME), Rouyn-Noranda, Quebec, Canada.
Isabelle Demers [email protected]
University of Québec in Abitibi-Témiscamingue (UQAT), Rouyn-Noranda, Quebec, Canada.
Research Institute of Mines and Environment (RIME), Rouyn-Noranda, Quebec, Canada.
Thomas Pabst
Research Institute of Mines and Environment (RIME), Rouyn-Noranda, Quebec, Canada.
Polytechnique Montréal, Montréal, Quebec, Canada.
Émilie Bresson
University of Québec in Abitibi-Témiscamingue (UQAT), Rouyn-Noranda, Quebec, Canada.
Research Institute of Mines and Environment (RIME), Rouyn-Noranda, Quebec, Canada.

Notes

*
Present address: Ministère de l’énergie et des ressources naturelles, Val d’Or, Quebec, Canada.
Present address: Ouranos, Montréal, Quebec, Canada.
Thomas Pabst served as an Editorial Board Member at the time of manuscript review and acceptance; peer review and editorial decisions regarding this manuscript were handled by Paul Simms.

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