Download Blasting in Mining - New Trends by Ajoy K. Ghose, Akhilesh Joshi PDF

By Ajoy K. Ghose, Akhilesh Joshi

Blasting practices in mines have gone through many alterations within the fresh earlier and stay honed and reconfigured to satisfy the calls for of today’s mining wishes. This quantity compiles papers of the workshop Blasting in Mines – New Trends, hosted through the Fragblast 10 Symposium . The 17 papers supply a combination which spotlight the evolving developments in blasting in mines. those diversity from designated concepts of solid blasting, functions of seed wave modelling for greater fragmentation, to layout of mass blasts and regulated blasting for balance of pit-walls. Blasting in Mines – New Trends should be of specific curiosity to mining and blasting engineers.

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At most large underground sulphide mines, production blasts must be initiated from surface by a Central Blasting System. 00 Void utilization r atio, % Figure 2. The effect of void utilization ratio on blasting cycle time. indb 16 10/3/2012 9:35:42 PM Figure 3. Delay timing of the one-shot stope in 513-1. 5 inches) diameter. 71 m (28″) is used as an initial void. For up-hole stopes of 15 m high, an inverse drop raise pattern is used, see Fig. 5. 7 Figure 4. Mine-B. THE EXPERIENCE AT MINE-K From 2004, Mine-K of Xstrata (then Falconbridge) also implemented a Six-Sigma project aimed at reducing the Blast Cycle time.

At most large underground sulphide mines, production blasts must be initiated from surface by a Central Blasting System. 00 Void utilization r atio, % Figure 2. The effect of void utilization ratio on blasting cycle time. indb 16 10/3/2012 9:35:42 PM Figure 3. Delay timing of the one-shot stope in 513-1. 5 inches) diameter. 71 m (28″) is used as an initial void. For up-hole stopes of 15 m high, an inverse drop raise pattern is used, see Fig. 5. 7 Figure 4. Mine-B. THE EXPERIENCE AT MINE-K From 2004, Mine-K of Xstrata (then Falconbridge) also implemented a Six-Sigma project aimed at reducing the Blast Cycle time.

With deterioration of the rock conditions due to weathering, presence of geological discontinuities, characterized by RMR of 30–45, the explosive consumption is reduced by 10–15% of normal charge. It is accomplished by inserting one bamboo stick (having 25–30 mm diameter) continuously in the charge column of each hole. This simple yet effective technique of charge reduction has yielded much desired results as could be seen from visibility of half barrels of pre-splitting holes on benches (Figure 8).

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