Control of Dilution and Ore Loss at AngloGold Ashanti, Iduapriem Mine using Blast Movement Monitoring System
Keywords:
Blast movement monitoring system, Ore loss, Dilution, Misclassification, ReconciliationAbstract
Blast Movement Monitoring (BMM) system is a new method of determining material movement during blasting in order to minimise ore loss, dilution and sometimes misclassification. The BMM system was introduced at AngloGold Ashanti Iduapriem (AAIL) Mine in the first quarter of 2013 as a result of reconciliation challenges at the start of operation at the Ajopa Pit in the first quarter of 2012. Since the introduction, there has been improvement in reconciliation, but the cost implication became worth assessing because of dwindling gold price. The main objective of this paper, therefore, is to assess the benefits or otherwise of BMM system on blast induced movement at Iduapriem Mine. The study comprises data collection on BMM system at AAIL and its analysis, as well as cost and benefit analysis. From the BMM data analysis, it was observed that, the bottom flitch of the blasted material moved more than the top flitch in the horizontal direction while the reverse was the case for the vertical movement. The cost-benefit analysis from four shots analysed revealed that there was a benefit of $753 835 which translates into 650% return on investment. Thus, the use of the BMM system has positive financial impact on Iduapriem Mine. Continuous use of the system as a grade control practice has, therefore, been recommended for the Mine, especially with shots containing ore. Furthermore, a dedicated team for this task has been recommended to enhance efficiency. Finally, high precision GPS has been suggested to be added to the detector instrument to make surveying of pre-blast and post-blast BMM points easier and faster.
References
Adam, M. and Thornton, D. M. (2004), “A New Technology for Measuring Blast Movementâ€, Proceedings of Innovative Mineral Developments - Achievements in a Changing World, Australasian Institute of Mining and Metallurgy, Sydney Branch, unpaginated.
Anon. (2013), “Iduapriem Competent Person’s Reportâ€, Mineral Resources, No. 52, 52pp.
Anon. (2015), “GP5200_Detector_Manual_ 1406_A4â€, www.bmt.com.au, Accessed: 10th March, 2015, pp. 1.
Baffoe, S. K. (2004), “Open Pit Mine Planning and Designâ€, Unpublished MSc Thesis Report, Western University College of KNUST, Tarkwa, Ghana, pp. 4 - 6, 29.
Cherry, J. T. (1967), “Computer Calculation of Explosion Produced Cratersâ€, International Journal of Rock Mechanics & Mining Science, 12 pp.
Cunningham, C. V. B. (1983), “The Kuz-Ram Model for Prediction of Fragmentation from Blastingâ€, Lulea Fragmentation Conference, Lulea, Sweden, pp. 439 - 453.
Favreau, R. F. (1980), “BLASTPA - A Practical Blasting Optimization Systemâ€, The Proceedings of Sixth Conference on Explosives and Blasting Technology, The Society of Explosives Engineers, Tampa, USA, pp. 152-164.
Harries, G. (1987), “The Calculation of Heave and Muckpile Profileâ€, Proceedings of the Second International Symposium on Rock Fragmentation by Blasting, The Society for Experimental Mechanics, Keystone, Colorado, pp. 248-256.
Lucas, R. and Nies, D. (1990), “Improving Fragmentation and Ore Displacement Controlâ€, Proceedings of the Sixteenth Conference on Explosives and Blasting Technique, The Society of Explosives Engineers. Orlando, Florida, pp. 409- 422.
Schamaun, J. T. (1983), “An Engineering Model for Predicting Rubble Motion during Blastingâ€, Proceeding of the 9th Conference on Explosives and Blasting Techniques, Society of Explosives Engineers, Dallas, Texas, pp. 199-200.
Taylor, S. L. (1995), “Blast Induced Movement and its Effects on Grade Dilution at the Coeur Rochester Mineâ€, MSc Thesis, Department of Mining Engineering, Mackay School of Mines, Reno, Nevada, 237 pp.
Thornton, D., Sprott, D. and Brunton, I. (2005), “Measuring Blast Movement to Reduce Ore Loss and Dilutionâ€, Proceeding of 31st Annual Conference on Explosives & Blasting Technique, Cleveland, OH, U.S.A., unpaginated.
Yang, R. L. and Kavetsky, A. (1989), “A Two Dimensional Kinematic Model for Predicting Muckpile Shape in Bench Blastingâ€, International Journal of Mining and Geological Engineering, London, Chapman and Hall, pp. 209-226.
Yang, R. L. and Kavetsky, A. (1990), “A Three Dimensional Model of Muckpile Formation and Grade Boundary Movement in Open Pit Blastingâ€, International Journal of Mining and Geological Engineering, London, Chapman and Hall, pp. 13-34.
Yennamani, A. L. (2010), “Blast Induced Rock Movement Measurement for Grade Control at the Phoenix Mineâ€, MSc Thesis, Department of Mining Engineering, Mackay School of Mines, Reno, Nevada, 123 pp.
Zhang, S. (1994), “Rock Movement due to Blasting and its Impact on Ore Grade Control in Nevada Open Pit Gold Minesâ€, MSc Thesis, Department of Mining Engineering, Mackay School of Mines, Reno, Nevada, 168 pp.
Zhang, S., Gilbride, L. J., Mousset-Jones, P. and Daemen, J. K., (1994), “Blast Rock Movement and its Impact on Ore Grade Control at Rain Mine Newmont Gold Companyâ€, Proceedings of 3rd International Symposium on Mine Planning and Equipment Selection, Istanbul, Turkey, pp. 713-719.
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