Articles scientifiques

Quantifying the Effect of Localized Depressurization on a Deep Underground Ore Body at the Mcarthur River Mine through Cross Hole Hydraulic Testing and Groundwater Modeling

Abstract:

The McArthur River mine in northern Saskatchewan is the largest single producer of uranium in the world. Most of the ore is extracted by raisebore mining methods at depths of 530 to 600 m below ground surface where pore pressures in the fractured host sandstone and gneiss are on the order of 5 MPa. Currently, ground freezing is used to isolate the ore from ground-water sources. Localized depressurising of the freezing drifts is being considered to increase their ground-stability.

Cross-hole flow and shut-in tests in eight NQ-size coreholes were conducted in the basement rock that is adjacent to a fault contact with the overlying 500 m thick sandstone unit. The hydrogeologic parameters of basement rock in the vicinity of a freezing drift were obtained. A 15% to 25% reduction of pore pressure over a 25 m distance was observed within a three hour test period.

A detailed three-dimensional ground-water flow model was constructed to replicate the pore pressure measured in the coreholes. The pore pressure distribution simulated from the model provides the hydrogeologic input for geotechnical engineers to evaluate ground-stability and assess whether additional active depressurising should be conducted.

Citation:

Liu, H., R. Bashir, S. Axen, J. Hatley, and G. Murdock. 2010. “Quantifying the Effect of Localized Depressurization on a Deep Underground Orebody at the McArthur River Mine through Cross Hole Hydraulic Testing and Groundwater Modelling.” Proceedings of the 3rd International Conference on Uranium 40th Annual Hydrometallurgy Meeting (Saskatoon, Canada, 15-18 August), vol. 1. E.K. Lam, J.W. Rowson, and E. Özberk, eds. Québec, Canada: Canadian Institute of Mining, Metallurgy and Petroleum: p. 241

Authors:

Houmao Liu

Link to Full Text:

Depressurisation Field Testing and Modeling.pdf

Dernières Nouvelles
  • Itasca France has moved! Itasca France's office is now located at : 29 Avenue Joannes Masset 69009 Lyon -...
    En savoir plus
  • Nous avons déménagé! Nous sommes désormais basés dans le 9ème arrondissement de Lyon, dans le secteur de Gorge...
    En savoir plus
  • Les licences Web sont désormais disponibles! Les licences Web sont particulièrement adaptées pour les structures avec de nombreux utilisateurs localisés à...
    En savoir plus

Évènements à Venir
2 nov.
JNGG 2020 Lyon
The 10th National Days of Geotechnics and Engineering Geology are co-organized by the GeoMaS laboratory of INSA Lyon, ENTPE and Cerema ... En savoir plus
2 févr.
ANALYSES OF EMBANKMENT DAMS AND SLOPES USING FLAC
This hands-on, virtual training course is 16 hours total, spread over four days in a 1.5-week period, and covers the analysis of embank... En savoir plus
6 sept.
AFTES 2021 - Underground, a space for innovation
The central theme of this edition is “the underground, a space of innovation”.... En savoir plus