Hogg, CS 2010, 'Some geotechnical aspects of closure — case study of a thickened tailings valley storage in Western Australia', 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. 73-82, https://doi.org/10.36487/ACG_rep/1008_07_Hogg
This paper explores geotechnical aspects of closure as it relates to valley type tailings storage facilities
(TSF). At closure differential settlement of the final tailings surface within a valley tailings storage facility
can be problematic. As the tailings consolidate, a ‘dish’ is formed within the tailings storage basin, typically
near the main embankment dam. The formation of a concave top surface has implications for closure of the
facility as rainfall runoff can migrate through the TSF top surface cover into the deposited tailings. In
addition, this may have implications with respect to the long term stability of the main embankment as
factors of safety may be reduced as the pond moves towards the embankment. Investigation of a valley
tailings storage in Northern Australia and subsequent consolidation analysis indicated that estimates of post
closure tailings settlement for the proposed top surface cover were manageable with the likelihood of
significant ponding on the TSF cover considered to be low.
Bowles, J.E. (1988) Foundation Analysis and Design, McGraw-Hill Book Company, New York, pp. 42–48.
Coffey Mining (2009a) Raising of Tailings Storage Facility RL 369 m to RL 378 m, Design Report, prepared for
Panoramic Resources Limited.
Coffey Mining (2009b) Tailings Storage Facility, Geotechnical Investigation, prepared for Panoramic Resources
Fahey, M. and Newson, T. (1996) Aspects of the Geotechnics of Mine Wastes and Tailings Dams, Australian Centre for
Geomechanics Workshop (powerpoint slide).
Lunne, T., Robertson, P.K. and Powell, J.J.M. (1997) Cone Penetration Testing in Geotechnical Practice, Spon Press,
Taylor & Francis Group, pp. 77–80.
McDonald, L. and Lane, J.C. (2010) Consolidation of in-pit tailings, in Proceedings First International Seminar on the
Reduction of Risk in the Management of Tailings and Mine Waste (Mine Waste 2010), A.B. Fourie and R.J.
Jewell (eds), 29 September – 1 October 2010, Perth, Australia, Australian Centre for Geomechanics, Perth,
MERIWA Project No. M241 (1998) Saline Tailings Disposal and Decommissioning, T.A. Newson and M. Fahey, The
University of Western Australia, pp. 4.1–4.19, Fig 4.1–4.30, pp. 5.1–5.28.
Neukircher, R.J. (1998) Mine Tailings Consolidation – A Case Study, in Proceedings Fifth Annual Tailings and Mine
Waste Conference, Colorado, USA, p. 297.