DOI https://doi.org/10.36487/ACG_repo/2355_54
Cite As:
Dadashi, A, Bussière, B & Wilson, GW 2023, 'Geochemical and hydrogeological behaviour of commingled mixtures of tailings and waste rock', in GW Wilson, NA Beier, DC Sego, AB Fourie & D Reid (eds),
Paste 2023: Proceedings of the 25th International Conference on Paste, Thickened and Filtered Tailings, University of Alberta, Edmonton, and Australian Centre for Geomechanics, Perth, pp. 693-703,
https://doi.org/10.36487/ACG_repo/2355_54
Abstract:
The conventional method of segregated disposal of tailings and waste rock is associated with several environmental problems, especially acid rock drainage (ARD) which is a challenging and crucial issue. Previous studies have shown that mixing tailings and waste rock can potentially decrease ARD potential. However, there are limited studies that quantify the effect of mixture ratio of waste rock and tailings on the water quality. This study presents a developed methodology to design and test different waste rock and tailings mixture ratios through leveraging particle packing theory for binary mixtures. The mineralogy and chemical properties of the mixtures is first presented. Three columns of mixture materials were mounted for a series of leaching tests over a period of about two years to experimentally simulate the impact of different mixture ratios on the water quality.
The preliminary results of the leach column tests demonstrate that the ratio of waste rock and tailings of the commingling mixtures influences the unsaturated hydrogeological behaviour and the water quality. The study also provides fundamental data to investigate the hydrogeological and geochemical behaviour of the tailings and waste rock mixtures. The approach used in this study can be implemented to determine an optimised mixture ratio to minimise ARD and alleviate the damaging environmental impacts of segregated disposal.
Keywords: acid rock drainage, commingled tailings and waste rock mixtures, leaching column tests
References:
ASTM International 2007, Standard Test Method for Particle-Size Analysis of Soils (D422-63 Reapproved), ASTM International, West Conshohocken,
Azam, S, Wilson, WG, Herasymuik, G, Nichol, C & Barbour, LS 2007, ‘Hydrogeological behaviour of an unsaturated waste rock pile: a case study at the Golden Sunlight Mine, Montana, USA’, Bulletin of Engineering Geology and the Environment, vol. 66, no. 3, pp. 259–268,
Bussière, B, Pabst, T, Boulanger-Martel, V, Guittonny, M, Plante, B, Neculita, C … & Labonté-Raymond, P-L 2020, ‘Monitoring the performance of mine site reclamation’, B Bussière & M Guittonny (eds), Hard Rock Mine Reclamation: From Prediction to Management of Acid Mine Drainage, CRC Press, Boca Raton, pp. 225–269,
Bussière, B 2007, ‘Hydrogeotechnical properties of hard rock tailings from metal mines and emerging geoenvironmental disposal approaches’, Canadian Geotechnical Journal, vol. 44, no. 9, pp. 1019–1052,
Fala, O, Molson, J, Aubertin, M & Bussière, B 2005, ‘Numerical modelling of flow and capillary barrier effects in unsaturated waste rock piles’, Mine Water and the Environment, vol. 24, no. 4, pp. 172–185,
Furnas, CC 1928, Report of Investigations, serial no. 2894, US Department of Commerce, Bureau of Mines.
Gowan, M, Lee, M & Williams, DJ 2010, ‘Co-disposal techniques that may mitigate risks associated with storage and management of potentially acid generating wastes’, in R Jewell & AB Fourie (eds), Mine Waste 2010: Proceedings of the First International Seminar on the Reduction of Risk in the Management of Tailings and Mine Waste, Australian Centre for Geomechanics, Perth, pp. 389–404,
Lefebvre, R, Hockley, D, Smolensky, J & Geélinas, P 2001, ‘Multiphase transfer processes in waste rock piles producing acid mine drainage. 1: Conceptual model and system characterization’, Journal of Contaminant Hydrology, vol. 52, no. 1–4,
Mbonimpa, M, Boulanger-Martel, V, Bussière, B & Maqsoud, A 2020, ‘Water, gas, and heat movement in cover materials’, Hard Rock Mine Reclamation: From Prediction to Management of Acid Mine Drainage, CRC Press, Boca Raton, pp. 47–91,
Merkus, HG 2009, Particle Size Measurements: Fundamentals, Practice, Quality, Springer, Dordrecht.
Pouliot, S, Bussière, B, Dagenais, A-M, Wilson, W, & Létourneau, Y 2018, ‘Evaluation of the use of sulphide paste rock as cover material in mine reclamation’, in C Wolkersdorfer, L Sartz, A Weber, J Burgess & G Tremblay (eds), Proceedings of the 11th ICARD/IMWA/MWD Conference, International Mine Water Association, Lakewood, pp. 559–564.
Wickland, BE, Wilson, GW & Wijewickreme, D 2010, ‘Hydraulic conductivity and consolidation response of mixtures of mine waste rock and tailings’, Canadian Geotechnical Journal, vol. 47, no. 4, pp. 472–485,
Wickland, BE 2006, Volume Change and Permeability of Mixtures of Waste Rock and Fine Tailings, PhD thesis, University of British Columbia, Vancouver.
Wilson, GW, Wickland B, Miskolczi, I, Andrina, J & Salzsauler, K 2022, ‘Commingling waste rock and tailings to produce geochemical and physical stability in mine waste deposits’, Proceedings of the 12th International Conference on Acid Rock Drainage, ICMS Australasia, Sydney.
Wilson, GW 2008, ‘Why are we still struggling acid rock drainage?’, Geotechnical News,
Zevgolis, IE 2018,’ Geotechnical characterization of mining rock waste dumps in central Evia, Greece’, Environmental Earth Sciences, vol. 77, no. 16,