Authors: Garvie, A; Donaldson, K; Williams, B; Chapman, J

Open access courtesy of:

Cite As:
Garvie, A, Donaldson, K, Williams, B & Chapman, J 2019, 'A demonstration of the cessation of spontaneous combustion in a coal overburden spoil pile', in AB Fourie & M Tibbett (eds), Proceedings of the 13th International Conference on Mine Closure, Australian Centre for Geomechanics, Perth, pp. 897-910.

Download citation as:   ris   bibtex   endnote   text   Zotero


Abstract:
Leigh Creek Coal Mine is located in South Australia approximately 550 km north of Adelaide and operated between 1944 and 2015. During operations, localised spontaneous combustion occurred on numerous occasions in the overburden spoil piles containing relatively small volumes of coal (about 0.8%). The majority of the overburden sequence consisted of sandstones and carbonaceous mudstones. Samples of overburden rocks had total sulfur and total organic carbon present at up to 2.2 and 14 wt% respectively. At the end of mining, localised surface temperatures of up to 200°C were measured. Laboratory testing demonstrated the potential for self-heating and spontaneous combustion of both coal and overburden material in the spoil piles. The management strategy selected for preventing spontaneous combustion in the post-closure period included: A trial of the management strategy was established in June 2017 in a location that was actively combusting. The batter slopes of the area were reduced, and an inert cover was placed over the area. Measurements of temperature, oxygen and carbon dioxide concentrations in the spoil pile over 20 months show that: Spoil pile conditions before and after the implementation of the management strategy are presented and an assessment of the effectiveness of the management strategy is provided.

Keywords: spontaneous combustion, overburden spoil pile, temperature, gas concentration, permeability, mitigation strategy, closure

References:
Aachib, M, Bonimpa, M & Aubertin, M 2004, ‘Measurement and prediction of the oxygen diffusion coefficient in unsaturated media, with application to soil covers’, Water, Air and Soil Pollution, vol. 156, pp. 163–193.
Amos, R, Blowes, D, Smith, L & Sego, DC 2009, ‘Measurement of wind induced pressure gradients in a waste rock pile’, Vadose Zone Journal, vol. 8, pp. 953–962.
Amos, RT, Blowes DW, Bailey, BL, Sego, DC, Smith, L & Ritchie, AIM 2015, ‘Waste-rock hydrogeology and geochemistry’, Applied Geochemistry, vol. 57, pp. 140–156.
CLD Mining 2018, ‘Assessment of fugitive coal in waste dumps’, in Flinders Power 2018, Approved Mine Closure Plan, Appendix JJJ.
Coffey 2017, ‘Geotechnical field test and discussion for the capping at field trial location – Leigh Creek mine closure’, in Flinders Power 2018, Approved Mine Closure Plan, Appendix VV.
Flinders Power 2018, Approved Mine Closure Plan, April 2019,
quarries/leigh_creek_coal_mine, viewed 29
Garvie, A, Donaldson, K, Beamish, B, Williams, B & Chapman, J 2019, ‘Management of spontaneous combustion in coal overburden spoil piles’, in N Aziz & B Kininmonth (eds), Proceedings of the 2019 Coal Operators’ Conference, University of Wollongong, Wollongong, pp. 265–273.
Kuo, E & Ritchie, AIM 1999, ‘Enhance oxidation by Cconvection in sulfidic rock piles: the influence of the form of the sulfidic oxidation rate’, in RR Fernández (ed.), Mine, Water and Environment: Proceedings of the IMWA International Congress, International Mine Water Association, pp. 455–460.
Lahmira, B, Lefebvre, R, Hockley, D & Phillip, M 2014, ‘Atmospheric controls on gas flow directions in a waste rock dump’, Vadose Zone Journal, vol. 13, no. 10.
Lefebvre, R, Lahmira, B & Lobner, W 2016, ‘Atmospheric control of radon emissions from a waste rock dump’, Environmental Geotechnics, Paper 15.00066, Institute of Engineers.
Lefebvre, R, Lamontagne, A, Wels, C & Robertson, A 2002, ‘ARD production and water vapour transport at the Questa Mine’, Proceedings of the Ninth International Conference on Tailings and Mine Waste, A.A. Balkema, Rotterdam, pp. 479–488.
MEND 1997, Assessment of Gas Transfer – ANSTO Model at Heath Steele Mines, MEND Project 1.22.1b, viewed 1 August 2019,
MWH Global 2017, ‘Leigh Creek coalfield spontaneous combustion management of waste rock dumps’, in Flinders Power 2018, Approved Mine Closure Plan, Appendix AAA.
Nelson, MI & Chen, XD 2007, ‘Survey on the experimental work on self heating and spontaneous combustion of coal’, The Geological Society of America, Reviews in Engineering Geology, vol. XVIII, pp. 21–83.
Pantelis, G & Ritchie, AIM 1991, ‘Macroscopic transport mechanisms as a rate-limiting factor in dump leaching of pyrite ores’, Applied Mathematical Modelling, vol. 15, pp. 136–143
Ritchie, AIM 1994, ‘Sulfide oxidation mechanisms: controls and rates of oxygen transport’, in A JL Jambor & DW Blowes (eds), Short Course on Environmental Geochemistry of SULFIDE Mine-Wastes, Waterloo, May.
Ritchie, AIM 1995, ‘Application of oxidation rates in rehabilitation design’, in NJ Grundon & LC Bell (eds), Proceedings of the Second Australian Acid Mine Drainage Workshop, Minerals Council of Australia and Australian Centre for Minesite Rehabilitation Research, pp. 101–116.
Tan, Y & Ritchie, AIM 1997, ‘In-situ determination of thermal conductivity of waste rock material’, Water, Air, Soil Pollution, vol. 98, pp. 345–359.
Vriens, B, St. Arnault, M, Laurenzie, L, Smith, Leslie, Mayer, KU & Beckie, RD 2018, ‘Localised sulfide oxidation limited by oxygen supply in a full-scale waste rock pile’, Vadose Zone Journal, vol. 17, no. 1,




© Copyright 2019, Australian Centre for Geomechanics (ACG), The University of Western Australia. All rights reserved.
Please direct any queries or error reports to repository-acg@uwa.edu.au