Authors: Bar, N; Semi, J; Koek, M; Owusu-Bempah, G; Day, A; Nicoll, S; Bu, J

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Bar, N, Semi, J, Koek, M, Owusu-Bempah, G, Day, A, Nicoll, S & Bu, J 2020, 'Practical waste rock dump and stockpile management in high rainfall and seismic regions of Papua New Guinea', in PM Dight (ed.), Proceedings of the 2020 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering, Australian Centre for Geomechanics, Perth, pp. 117-128,

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Papua New Guinea (PNG) is host to several topographically, geologically and climatically different environments. The central and western provinces of the mainland (‘the highlands’) are topographically elevated between 1,000 and 4,000 m above sea level. The terrain is very rugged and the climate is cool all year round. This region is hosted by uplifted sea floor sedimentary rocks, some of which have been metamorphosed. There is no wet or monsoon season. Rather, rainfall occurs quite steadily all year round. Annual rainfall can easily exceed 10,000 mm in some areas and low magnitude earthquakes are frequently experienced. The smaller outer islands are topographically flatter, seismically active and receive in the order of 5,000 mm annual rainfall. Rainfall usually occurs in the form of high intensity thunderstorms. The climate is very hot and humid. These islands often comprise a combination of volcanics and some sedimentary rocks. Mining is a major industry in PNG and very large open pits have been constructed with excavated slope heights ranging from 300 to 1,000 m. Open pit mine slopes are designed with a serviceable life of no more than 10 to 20 years. As such, predicted and well-managed failures or landslides are usually considered acceptable. Waste rock and low-grade ore are often placed in constructed rockfill dumps and stockpiles which range in heights from 50 to over 300 m. High rockfill slope heights developed on often steep foundations, coupled with the erosive and pore pressure effects of rainfall and seismicity can create significant landslide hazards. This paper presents the cumulative efforts of practitioners managing risks associated with rockfill dumps and stockpiles in PNG.

Keywords: rockfill, colluvium, waste rock dumps, stockpiles, slope stability

Baczynski, NRP & Bar, N 2017, ‘Landslide monitoring and management challenge in remote Papua New Guinea’, Proceedings of the 4th World Landslide Forum, Springer, Cham, pp. 343–354.
Bar, N, Kuira, P & Semi, J 2014, ‘Managing risk associated with erosion-driven slope instabilities with ground support & surface water management in a high rainfall environment at Ok Tedi Copper-Gold Mine’, Proceedings of Mastering Complex Projects Conference 2014, Engineers Australia, Barton, pp. 191–202.
Bar, N, Reynolds, M, Nicoll, S & Bran, D 2018, ‘Geotechnical data management and visualization systems: meeting the data challenge of the 21st century and maximizing value for open pit mines’, in V Litvinenko (ed.), Proceedings of the 2018 European Rock Mechanics Symposium: Eurock 2018, CRC Press, Boca Raton.
Bar, N & Weekes, G 2017, ‘Directional shear strength models in 2D and 3D limit equilibrium analyses to assess the stability of anisotropic rock slopes in the Pilbara Region of Western Australia’, Australian Geomechanics Journal, vol. 52, no. 4,
pp. 91–104.
Bar, N, Yacoub, TE & McQuillan A 2019, ‘Analysis of a large open pit mine in Western Australia using finite element and limit equilibrium methods’, Proceedings of the 53rd US Rock Mechanics/Geomechanics Symposium, American Rock Mechanics Association, Alexandria, 8 p.
Barton, NR 2008, ‘Shear strength of rockfill, interfaces and rock joints, and their points of contact in rock dump design’, in AB Fourie (ed.), Proceedings of The First International Seminar on the Management of Rock Dumps, Stockpiles and Heap Leach Pads, Australian Centre for Geomechanics, Perth, pp. 3–18.
Barton, NR & Kjaernsli, B 1981, ‘Shear strength of rockfill’, Journal of the Geotechnical Engineering Division: Proceedings of the American Society of Civil Engineers, vol. 107-GT7, pp. 873–891.
Fisher, M, Davies, M, Anderson, WS & Savigny, KW 2003, ‘Stewarding mine dump mass movements by regional landslide analogy’, Proceedings of the 3rd Canadian Conference on Geotechniques and Natural Hazards, Canadian Geotechnical Society, Edmonton.
Hawley, M 2000, ‘Site selection, characterization, and assessment’, Proceedings of Slope Stability in Surface Mining, Society for Mining, Metallurgy & Exploration, Englewood, pp. 267–274.
Hawley, M & Cunning, J 2017, Guidelines for Mine Waste Dump and Stockpile Design, CSIRO Publishing, Clayton, 370 p.
Read, JRL & Maconochie, AP 1992, ‘The Vancouver Ridge landslide, Ok Tedi Mine, Papua New Guinea’, Proceedings of the 6th International Symposium on Landslides, A.A. Balkema, Rotterdam, pp. 1317–1321.

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