Geotechnical and Geological Engineering

, Volume 26, Issue 4, pp 349–366 | Cite as

Assessment and Control of Ore Dilution in Long Hole Mining: Case Studies

Original Paper


Unplanned ore dilution has a direct and large influence on the cost of a stope, and ultimately on the profitability of a mining operation. This paper presents the results of an examination of factors influencing ore dilution in a blasthole stoping environment. For the study, a comprehensive database was established, incorporating information related to the design, construction, excavation and cavity surveys of 172 sequentially mined long hole stope case histories from two orezones. Through a review of the case studies, it was demonstrated that, in addition to stope dimension, the amount of unplanned dilution differed according to stope type. Five stope types were identified, based on their position within a tabular blasthole mining sequence. Measured overbreak varies with stope type, with secondary stopes generating a greater volume of hanging-wall dilution than do primary stopes. Furthermore, a case study is presented to demonstrate the role cablebolts installed in the stope hanging-wall play to control ore dilution. The study illustrates relationships between measured hanging-wall overbreak, cablebolt orientation and stope type.


Parametric numerical modeling Ore dilution Rock mechanics Underground mining Hanging-wall reinforcement Stope type Stope case study 


  1. Anderson B, Grebenc B (1995) Controlling dilution at the Golden Giant mine. In: Proceedings of the 12th CIM mine operators conference, Timmins, February 1995Google Scholar
  2. Arjang B (1996) In situ ground stresses in the Abitibi Mining District. CIM Bull 89:996Google Scholar
  3. Arjang B (1988) Pre-mining ground stresses at the Bousquet/Dumagami mines, Cadillac, Quebec. Division Report MRL 88-132 (TR), CANMET, Energy, Mines and Resources CanadaGoogle Scholar
  4. Barton N, Lien I, Lunde J (1974) Engineering classification of rock masses for the design of tunnel support. Rock Mech 6(4):186–236CrossRefGoogle Scholar
  5. Bieniawski ZT (1984) Rock mechanics design in mining and tunnelling. A.A. Balkema, Rotterdam, p 272Google Scholar
  6. Calvert TM, Simpson JB, Sandy MP (2000) Open stope design at Normandy Golden Grove Operations. In: Proceedings of MassMin 2000, Brisbane, Australia, 29 October–2 November 2000. pp 653–659Google Scholar
  7. Canadian Mining Journal (2002) 2002 Mining Sourcebook, 111th annual edition. In: Scales M (ed) Business information group, Don Mills, Ontario. ISSN 0840–6723Google Scholar
  8. Connors C, Wheeler L, Forsyth B, Clark L (1996) Determination of blast damage mechanisms in low quality rock masses. CANMET DSS File 02SQ.23440-4-1046Google Scholar
  9. Deere DU (1968) Geological consideration. In: Stagg KG, Zienkiewicz OC (eds) Rock mechanics in engineering practice. Wiley, NewYorkGoogle Scholar
  10. Dunne K, Pakalnis RC (1996) Dilution aspects of a sublevel retreat stope at Detour Lake Mine. In: Aubertin M, Hassani F, Mitri H (eds) Rock mechanics. Balkema, Rotterdam, pp 305–313. ISBN 90 5410 838 XGoogle Scholar
  11. Elbrond J (1994) Economic effects of orelosses and rock dilution. CIM Bull 87(978):131–134Google Scholar
  12. Gauthier P (2001) Minage des zones étroites à la Mine Bousquet. In: Proceedings of the international symposium on mining techniques of narrow-vein deposits, Val-d’Or, Quebec, 1–4 October, 2001, pp 45–55Google Scholar
  13. Germain P, Hadjigeorgiou J, Lessard JF (1996) On the relationship between stability prediction and observed stope overbreak. In: Aubertin M, Hassani F, Mitri H (eds) Rock mechanics. Balkema, Rotterdam, pp 277–283. ISBN 90 5410 838 XGoogle Scholar
  14. Henning JG (2007) Evaluation of long-hole mine design influences on unplanned ore dilution. Ph.D. Thesis, McGill University, Montreal, Quebec. p 331Google Scholar
  15. Henning JG, Mitri HS (2007) Mine planning for ore dilution. In: Proceedings of the 109th CIM annual general meeting, Montreal, April 29–May 2, 2007, p 8Google Scholar
  16. Henning JG, Mitri HS (2006) Numerical modelling of ore dilution in blasthole stoping. Int J Rock Mech Mining Sci 44(5):692–703CrossRefGoogle Scholar
  17. Hyett AJ, Bawden WF, Reichert (1992) The effect of rock mass confinement on the bond strength of fully grouted cable bolts. Int J Rock Mech Min Sci Geomech Abstr 29(5):503–524Google Scholar
  18. Kaiser PK, Diederichs M, Yazici S (1992) Cable bolt performance during mining induced stress change – Three case examples. In: Kaiser PK, McCreath DR (eds) Rock support in mining and underground construction. Balkema, Rotterdam. ISBN 90 5410 044 3Google Scholar
  19. Mah SGL, Pakalnis RT, Poulin R, Clark, LM (1995) Obtaining quality cavity monitoring survey data. In: Proceedings of the CAMI’95: 3rd Canadian conference on computer applications in the mineral industry, Montréal, Québec, Oct 22–25, pp 400–407Google Scholar
  20. Maloney S, Fearon R, Nose J, Kaiser PK (1992) Investigations into the effect of stress change on support capacity. In: Kaiser PK, McCreath DR (eds) Rock support in mining and underground construction. Balkema, Rotterdam. ISBN 90 5410 044 3Google Scholar
  21. Mathews KE, Hoek E, Wyllie DC, Steward SBV (1981) Prediction of stable excavations for mining at depths below 1000 Metres in hard rock. CANMET Report DSS Serial No. OSQ80-00081, DSS File No. 17SQ.23440-0-9020. Ottawa. Dept. Energy, Mines and ResourcesGoogle Scholar
  22. Miller F, Potvin Y, Jacob D (1992) Laser measurement for open stope dilution. CIM Bull 85(962):96–102Google Scholar
  23. Milne DM, Pakalnis RC, Lunder PJ (1996) Approach to the quantification of hanging-wall behaviour. Trans Instn Min Metall (Sect A: Min Industry) 105:A69–A74Google Scholar
  24. Pakalnis RC (1986) Empirical stope design in Canada. Ph.D. Thesis. University of British Columbia, 276 ppGoogle Scholar
  25. Pakalnis RC, Poulin R, Hadjigeorgiou J (1995) Quantifying the cost of dilution in underground mines. Mining Eng pp 1136–1141Google Scholar
  26. Pakalnis R, Vongpaisal S (1998) Empirical design methods - UBC geomechanics. In: Proceedings of the 100th CIM annual general meeting, Montréal, Québec, 3–7 May 1998Google Scholar
  27. Pelley CW (1994) A study of sequencing strategy for steep, tabular, hardrock orebodies. Ph.D. Thesis. McGill University, 310 ppGoogle Scholar
  28. Potvin Y (1988) Empirical open stope design in Canada. Ph.D. thesis. Dept. Mining and Mineral Processing, University of British ColumbiaGoogle Scholar
  29. Scoble MJ, Moss A (1994) Dilution in underground bulk mining: Implications for Production Management, mineral resource evaluation II, methods and case histories, Geological Society Special Publication No. 79, 95–108Google Scholar
  30. Trevor SM (1991) Dilution control at Hudson Bay mining & smelting, Flin Flon operations. In Proceedings of the 93rd CIM annual general meeting, Vancouver, British ColumbiaGoogle Scholar
  31. Uggalla S (2001) Sublevel open stoping – design and planning at the Olympic Dam Mine. Underground mining methods: engineering fundamentals and international case studies. In: Hustrulid WA, Bullock RL (eds) Society for Mining, Metallurgy, and Exploration, Inc., Littleton, Colorado, USA, pp 239–244Google Scholar
  32. Vallée M, David M, Dagbert M, Desrochers C (1992) Guide to the evaluation of gold deposits; CIM Special volume 45. ISBN 0-919086-31-4Google Scholar

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Goldcorp Canada Inc., Porcupine Gold MinesSouth PorcupineCanada
  2. 2.Department of Mining, Metals and Materials EngineeringMcGill UniversityMontrealCanada

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