Authors: Lewis, PA; Clark, LM; Rowles, SJ; Auld, CP; Petryshen, CM; Elderkin, AP

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Lewis, PA, Clark, LM, Rowles, SJ, Auld, CP, Petryshen, CM & Elderkin, AP 2018, 'Sublevel retreat mining in the subarctic: a case study of the Diavik Diamond Mine', in Y Potvin & J Jakubec (eds), Proceedings of the Fourth International Symposium on Block and Sublevel Caving, Australian Centre for Geomechanics, Perth, pp. 57-72.

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Abstract:
Diavik Diamond Mine is located on the subarctic tundra of the Northwest Territories, Canada, 300 km northeast of Yellowknife. When its first two open pits were exhausted in 2012, it completed the full transition to underground mining. Three orebodies are currently being mined underground using two mining methods: blasthole open stoping and sublevel retreat (SLR). SLR was not an original method as described in the feasibility study. As the pits were mined, the underground project developed, and additional information became available. Over time, it became apparent that SLR would be the optimal method for two of the orebodies. A great deal has been learnt throughout development and operation of the SLR method at Diavik. This paper examines considerations for ventilation, production drilling and blasting, geotechnical concerns, and operational constraints for SLR mining in the subarctic. It also describes the process for method selection and the overall lessons learned. Keywords: sublevel retreat, SLR, arctic, underground

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References:
BGC Engineering Inc. 2017, Ground Control Management Plan, report produced for Diavik Diamond Mines, BGC Engineering Inc., Vancouver.
Golder Associates Ltd. 2009, Summary of Cemented Rockfill and Paste Studies for Underground Mine Backfill, report produced for Diavik Diamond Mines, Golder Associates Ltd., Yellowknife.
Jakubec, J 2011, Memo: SLR – Operational Readiness Review, report produced for Diavik Diamond Mines, SRK Consulting, Vancouver.
Jakubec, J, Page C & Harvey, P 2004, ‘Mining method selection for diamond mines - challenges in the arctic’, in A Karzulovic & MA Alfaro (eds), Proceedings of MassMin 2004, Instituto de Ingenieros de Chile, Santiago.
McIntosh Engineering 2007, Diavik Underground Feasibility Report Final, report produced for Diavik Diamond Mines, McIntosh Engineering.
Yip, CG & Pollock, KS 2017, Diavik Diamond Mine NI 43-101 Technical Report, Diavik Diamond Mines Inc., Yellowknife.




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