Selection of Blast Design for Kofi C Pit of Endeavour Mining Corporation, Mali

Authors

  • Daniel Mireku-Gyimah University of Mines and Technology
  • S. K. Boateng

Keywords:

Blast Design, Cost Analysis, Drilling and Blasting Productivity, Kuz-Ram Ragmentation Model

Abstract

 

The Kofi Gold Mine (KGM) of Endeavour Mining Corporation in Mali needed to select one of two alternative blast designs, Blast Design 1 (BD1) and Blast Design 2 (BD2), for the fresh rocks of the deposit, both ore and waste,  in their Kofi C Pit. BD1 has a burden of 3.2 m, a spacing of 3.5 m, a bench height of 5.0 m and a sub drill of 0.5 m. BD2 has a burden of 3.5 m, a spcing of 4.0 m, a bench height of 10.0 m and a sub drill of 0.8 m. Both designs have the same hole diameter of 115 mm  and powder factor of  0.68 kg/m3. The Modified Kuz-Ram Fragmentation Model was used to estimate and compare the fragmentation of the two designs. The modelling results showed that the fragmentation of BD1 would be better than that of BD2 but cost analysis revealed that the drilling and blasting cost of BD2 would be lower than that of BD1. Consequently, BD2 was modified into Blast Design 3 (BD3) to improve its fragmentation without exceeding the drilling and blating cost of BD1. The modification was done by increasing the powder factor of BD2 by 16.18 %. Subsequent fragmentation modelling and cost analysis revealed that BD3 and BD1 would now have the same fragmentation and the same drilling and blasting cost but BD3 would give a higher productivity. It was therefore recommended that KGM selects BD3 over BD1 and BD2 for ore drilling and blasting. BD2 could be considered for waste drilling and blasting because its lower fragmentation, which is not good enough when the rock is ore, is acceptable when the rock is waste.

 

Keywords: Blast Design, Cost Analysis, Drilling and Blasting Productivity,  Kuz-Ram Ragmentation Model

References

Akinbinu, V. A. and Sellers, E. J. (2014), ‘‘Particle Size Distribution by Static Loading and Fragmentation using Explosive’’, Proceedings of the 40th Annual Conference on Explosives and Blasting Technique, ISEE, Denver, Colorado, USA, pp. 489 – 498.

Cremonese, D., Seccatore, J., Passos, A., Marin, T. and de Tomi, G. (2016), ‘‘Blasting and Comminution Choices for the Management of the Mining Business’’, Proceedings of the 42nd Annual Conference on Explosives and Blasting Technique, ISEE, Las Vegas, Nevada, USA, pp. 303 - 310.

Cunningham, C. V. B. (2005), ‘‘The Kuz-Ram Fragmentation Model - 20 Years On’’, Proceedings of 3rd Conference on Explosives and Blasting, European Federation of Explosives Engineers, Holmberg, R. (ed.), Brighton, England, pp. 201-210.

Hawke, S. (2011), “Blast Design Assistant Introduction’’, Workshop Lecture Notes, Orica Mining Services, 150 pp.

Hüdaverdi, T. and Akyıldız, O. (2016), “Application of Blast Fragmentation Models in a Sandstone Quarryâ€, Proceedings of the 42nd Annual Conference on Explosives and Blasting Technique, ISEE, Las Vegas, Nevada, USA, pp. 375 - 384.

Ireland, K. (2000), “Surface Mining Explosives Engineering Training Courseâ€, Handbook of AEL Blast Consult, African Explosives Limited, 369 pp.

Lownds, C. M. (1997), ‘‘The Effect of Powder Factor on Fragmentation’’, Proceeding of 23rd Annual Conference on Explosives and Blasting Technique, ISEE, Las Vegas, Nevada, pp. 101 - 109.

Nielsen, K. (1985), “Sensitivity Analysis for Optimum Open Pit Blastingâ€, Proceedings of 11th Annual Conference on Explosives and Blasting Technique, ISEE, San Diego, pp. 85 - 95.

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Published

2018-12-28

Issue

Vol. 18 No. 2 (2018): Ghana Mining Journal December Issue

Section

Mining Eng. Articles

License

Copyright © 2021 University of Mines and Technology (UMaT), Tarkwa. Ghana