Store and release cover performance at Cadia Hill gold mine, Australia

Authors: Rohde, TK; Williams, DK; Burton, J

DOI https://doi.org/10.36487/ACG_rep/1152_36_Rohde

Cite As:
Rohde, TK, Williams, DK & Burton, J 2011, 'Store and release cover performance at Cadia Hill gold mine, Australia', in AB Fourie, M Tibbett & A Beersing (eds), Mine Closure 2011: Proceedings of the Sixth International Conference on Mine Closure, Australian Centre for Geomechanics, Perth, pp. 333-342, https://doi.org/10.36487/ACG_rep/1152_36_Rohde

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Abstract:
The rehabilitation of waste rock dumps to minimise potential contamination is site specific; being a function, among other factors, of the rock types, the dumping and storage method employed, and the climatic setting. Three experimental store and release cover trials have been developed and constructed as part of a larger trial waste rock dump at Cadia Hill gold mine (Newcrest Mining) in Central New South Wales, Australia. The development of store and release cover systems for the temperate conditions typically experienced at Cadia (700 to 1,200 mm of rainfall annually) signals a significant departure from the climatic settings of other store and release cover system applications throughout Australia (typically semi-arid climates with less than half the annual rainfall of Cadia). The store and release cover system relies on the storage of rainfall during the wet season and its release during the dry season through evapotranspiration. It typically comprises a compacted fine-grained sealing layer (typically compacted clay) overlain by a significant thickness of loose “rocky soil mulch”. Where there is a local paucity of clay and suitable rocky soil mulch, it may be possible to manufacture suitable cover materials from mixtures of benign tailings and benign waste rock crushed by haul truck trafficking. The paper describes trial store and release covers constructed at Cadia using such mixtures, the instrumentation of the trial covers and monitoring data collected over the past four years.

References:
Bews, B., Wilson, G. and O’Kane, M. (1997) The design of lysimeters for low flux cover systems over acid generating waste, Proceedings of Canadian Geotechnical Golden Jubilee Conference, Canadian Geotechnical Society, Alliston, pp. 26–33.
Campbell Scientific Inc. (2000) Instruction Manual for TDR100, Revision 4/02.
Campbell, G. (2006) Calibration of Heat-Dissipation Sensors (CS229): Technical Note from Geochemistry/Soil-Physics Laboratory.
Flint, A., Campbell, G., Ellet, P. and Calissendorff, C. (2002) Calibration and Temperature Correction of Heat Dissipation Matric Potential Sensors, Soil Science Society of America Journal, Vol. 66, pp. 1439–1445.
Ledieu, J., De Ridder, P., De Clerk, P. and Dautrebande, S. (1986) A method of measuring soil moisture by time-domain reflectometry, Journal of Hydrology, Vol. 88, pp. 319–328.
O’Kane, M. and Barbour, L. (2003) Predicting Field Performance of Lysimeters Used to Evaluate Cover Systems for Mine Waste, Proceedings of Sixth International Conference on Acid Rock Drainage, 14–17 July 2003, Cairns, Australia, Australian Centre for Mining Environmental Research, Brisbane, pp. 327–339.
Topp, G., Davis, J. and Annan, A. (1980) Electromagnetic determination of soil water content: measurement in coaxial transmission lines, Water Resources Research, Vol. 16, pp. 574–582.
Williams, D., Currey, N., Ritchie, P. and Wilson, G. (2003a) Kidston Waste Rock Dump Design and ‘Store and Release’ Cover Performance Seven Years On, Proceedings of Sixth International Conference on Acid Rock Drainage, 14–17 July 2003, Cairns, Australia. Australian Centre for Mining Environmental Research, Brisbane,
pp. 419–426.
Williams, D., Jeffery, J., Gilbert, L., Wilson, G., Panidis, C. and Perry, B. (2003b) A review of the Acid Rock Drainage Potential and Hydrological Implications of Selectively-Placed Waste Rock at a Gold Mine in NSW, Australia, Proceedings of Sixth International Conference on Acid Rock Drainage, 14–17 July 2003, Cairns, Australia, Australian Centre for Mining Environmental Research, Brisbane, pp. 949–954.
Williams, D., Wilson, G. and Panidis, C. (2003c) A review of the Acid Rock Drainage Potential and Hydrological Implications of Selectively-Placed Waste Rock at a Gold Mine in NSW, Australia, Proceedings of Sixth International Conference on Acid Rock Drainage, 14–17 July 2003, Cairns, Australia, Australian Centre for Mining Environmental Research, Brisbane, pp. 427–435.
Williams, D.J. and Rohde, T.K. (2008) Waste rock dump rainfall infiltration and base seepage at Cadia, Proceedings of Sixth Australian Workshop on Acid and Metalliferous Drainage, Burnie, Australia, 15–18 April 2008, Burnie, Australia, Australian Centre for Mining Environmental Research, Brisbane, pp. 151–162.




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