Journal of Geosciences and Geomatics
ISSN (Print): 2373-6690 ISSN (Online): 2373-6704 Website: http://www.sciepub.com/journal/jgg Editor-in-chief: Maria TSAKIRI
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Journal of Geosciences and Geomatics. 2015, 3(5), 116-121
DOI: 10.12691/jgg-3-5-1
Open AccessReview Article

Ore Grade Reconciliation Techniques – A Review

Amoako Richard1, and Al-Hassan Sulemana1

1Mining Engineering Department, University of Mines and Technology, Tarkwa, Ghana

Pub. Date: October 22, 2015

Cite this paper:
Amoako Richard and Al-Hassan Sulemana. Ore Grade Reconciliation Techniques – A Review. Journal of Geosciences and Geomatics. 2015; 3(5):116-121. doi: 10.12691/jgg-3-5-1

Abstract

The essence of ore grade reconciliation is to identify, analyse and manage variance between planned and actual results in a way that highlights opportunities. A consistent record of poor reconciliation is an indication that this variance has not been adequately managed. This would inevitably result in significant economic impact on mining companies. Unfortunately, the issue of poor reconciliation has been an age-old one most mining companies have been battling with and resulting in failure of several mining companies to estimate ore grade accurately, despite good grade control sampling and geological control. This paper reviews various practical and theoretical approaches to ore grade reconciliation, and further reveals inefficiencies in the mining value chain that contribute to poor reconciliation. Key recommendations, pertinent to observations and findings of the study, are thus made towards improving ore grade reconciliation.

Keywords:
ore grade reconciliation grade control exploration mine call factors ore loss dilution sampling

Creative CommonsThis work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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References:

[1]  Blucher, I. D. (2002). “Reconciliation – Towards an Ideal Process”, in Proceedings of Value Tracking Symposium, Brisbane, Queensland, Australia, pp. 187-189.
 
[2]  Clow, G. (1991). “Why Gold Mines Fail”, Northern Miner Magazine, Vol. 2, No. 4, pp. 31-34.
 
[3]  Fouet, T., Riske, R., Morley, C., Cook, A., Centofanti, J. and Conti, D. (2009). “Standardising the Reconciliation Factors Required in Governance Reporting”, Proceedings of 7th International Mining Geology Conference, The Australasian Institute of Mining and Metallurgy, Melbourne, pp. 127-139.
 
[4]  Gilfillan, J. and Levy, I. W. (2001). “Monitoring the Reserve”, in Mineral Resource and Ore Reserve Estimation – The AusIMM Guide to Good Practice, Edwards, A. C. (ed.), The Australasian Institute of Mining and Metallurgy, Melbourne, pp. 537-544.
 
[5]  Knoll, K. (1989). “And Now the Bad News”, Northern Miner Magazine, Vol. 4, No. 6, pp. 48-52.
 
[6]  Parhizkar A., Ataee, M., Moarefvand, P., Rasouli V. and Bangian, A.H. (2010). “A New Model to Improve Ore Grade Reconciliation between the Exploration Model and the Mine”, Proceedings of Mine Planning and Equipment Selection (MPES) Conference, Fremantle, Western Australia, pp. 89-94.
 
[7]  Pitard, F. F. (2001). “A Strategy to Minimise Ore Grade Reconciliation Problems between the Mine and the Mill”, in Mineral Resource and Ore Reserve Estimation – The AusIMM Guide to Good Practice, Edwards, A. C. (ed.), The Australasian Institute of Mining and Metallurgy (The AusIMM), Melbourne, pp. 557-566.
 
[8]  Riske, R., Mark, P.D. and Helm, S. (2010). Mine Reconciliation – for better or worse!, Snowden Mining, Canada, 8 pp.
 
[9]  Rossi, M. E. (1999). “Improving the Estimates of the Recoverable Reserves”, in Mining Engineering, Volume 51, Society for Mining, Metallurgy, and Exploration (SME), pp. 50-54.
 
[10]  Rossi, M. E. and Camacho J. V. (2000). “Using Meaningful Reconciliation Information to Evaluate Predictive Models”, Society for Mining, Metallurgy, and Exploration (SME) Transactions, Volume 308, pp. 78-82.
 
[11]  Rossi, M.E. and Parker, H.M. (1993). “Estimating Recoverable Reserves, Is It Hopeless?” in Geostatistics for the Next Century, Dimitrakopoulos, R. (ed.), Kluwer Academic Publishers, Boston, MA, pp. 259-276.
 
[12]  Thomas, M. and Snowden, V. (1990). “Improving Reconciliation and Grade Control by Statistical and Geostatistical Analysis: Strategies for Grade Control”, AIG Bulletin, Volume 10, pp. 49-59.