Authors: Marco, F; Vallejos, JA; Castro, R; Hekmat, A
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Effective evaluation of ore dilution enables more accurate application of mining, especially in narrow vein deposits. Drilling and blasting are one of the most important unit operations in the mining cycle which can strongly influence the stope dilution. This paper develops a methodology to assess the effect of mining and geotechnical conditions on stope dilution in selective underground mining at a goldsilver mine in Chile. To achieve this, a database of the mine conditions and a logistic regression of the dilution were built. The Logistic regression model indicated that the most important variables for dilution differ in the case of the hanging wall and footwall. Based on the hanging wall dilution model a design tool was developed to define the maximum drill deviation and potential distance between sublevels. The objective was to achieve a potential dilution less than the admissible percentage at the mine.


Marco, F, Vallejos, JA, Castro, R & Hekmat, A 2015, 'A dilution model for narrow vein mine design — a case study', in Y Potvin (ed.), Proceedings of the International Seminar on Design Methods in Underground Mining, Australian Centre for Geomechanics, Perth, pp. 541-552.

Bieniawski, ZT 1989, Engineering rock mass classifications, John Wiley & Sons, New York.
Clark, LM 1998, ‘Minimizing dilution in open stope mining with focus on stope design and narrow vein longhole blasting’ Master of Science thesis, University of British Columbia.
Clark, LM & Pakalnis, RC 1997, ‘An empirical design approach for estimating unplanned dilution from open stope hangingwalls and footwalls’, Proceedings of the CIM 99th Annual General Meeting, Canadian Institute of Mining, Metallurgy and Petroleum, Westmount, QC.
Marco, F 2015, ‘Evaluación del efecto tronadura en la estabilidad y dilución de caserones en minería subterránea selectiva’ Master of Science thesis, University of Chile. [In Spanish]
Mathews, KE, Hoek, E, Wyllie, DC & Stewart, S 1981, Prediction of stable excavation spans for mining at depths below 1,000 metres in hard rock / Golder Associates, CANMET Library & Documentation Services Division, Vancouver.
Mawdesley, C, Trueman, R & Whiten, W 2001, ‘Extending the Mathews stability graph for open stope design’, Mining Technology, vol. 110, no. 1, pp. 27-39.
Potvin, Y 1988, ‘Empirical open stope design in Canada’, PhD thesis, University of British Columbia.
Stewart, P 2005, ‘Minimizing dilution in narrow vein mines’ PhD thesis, University of Queensland.
Stewart, PC & Trueman, R 2008, ‘Strategies for minimising and predicting dilution in narrow-vein mines – NVD Method’, Proceedings of the Narrow Vein Mining Conference, The Australasian Institute of Mining and Metallurgy, Melbourne,
pp. 153-164.
Suorineni, FT 1998, ‘Effects of faults and stress on open stope design’ PhD thesis, University of Waterloo.
Suorineni, FT, Tannant, DD & Kaiser, PK 1999, ‘Fault factor for the stability graph method of open-stope design’, Transactions of the Institution of Mining and Metallurgy Section A-Mining Industry, vol. 108, pp. A92-A104.
Wang, J 2004, ‘Influence of stress, undercutting, blasting, and time on open stope stability and dilution’ PhD thesis, University of Saskatchewan.
Wang, J, Milne, D, Yao, M & Allen, G 2002, ‘Quantifying the effect of hanging wall undercutting on stope dilution’, Proceedings of the CIM 104th Annual General Meeting, Canadian Institute of Mining, Metallurgy and Petroleum, Westmount, Quebec, 8 p.
Yao, X, Allen, G & Willett, M 1999, ‘Dilution evaluation using cavity monitoring systems at HBMS—Trout Lake Mine’, Proceedings of the CIM 101st Annual General Meeting, Canadian Institute of Mining, Metallurgy and Petroleum, Westmount, Quebec.

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