Mining

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

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By Ajoy K. Ghose, Akhilesh Joshi

Blasting practices in mines have gone through many alterations within the contemporary prior and remain 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 via the Fragblast 10 Symposium . The 17 papers offer a mixture which spotlight the evolving traits in blasting in mines. those diversity from targeted strategies of solid blasting, purposes of seed wave modelling for stronger fragmentation, to layout of mass blasts and regulated blasting for balance of pit-walls. Blasting in Mines – New Trends may be of specific curiosity to mining and blasting engineers.

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Indb 19 10/3/2012 9:35:44 PM Figure 8. The delay timing sequence of Stope 221-20-43 which is a typical one-shot stope at Mine-L. methodology has seen significant results in reducing the cycle time of drill and blast and improving the safety of employees working in stopes. , Ellis, B. & Chung, S. 2005. Application of advanced blasting technologies for large scale de-stress blasts at Brunswick Mine, CIM Bulletin, June/July 2005, Montreal, Canada. D. & Roberge, S. 2007. “Application of mass-blast principle for stope blasting in deep mines”, Chapter 7, Challenges in deep and high stress mining, Y.

E. presplitting has been applied at RAM. The theory of pre-splitting is that when shock waves from simultaneously detonating charges in adjoining blast holes collide, tension occurs in the rock, forming a crack in the web between the holes. Firouzadj et al. (2006) concluded that that small diameter holes in pre-splitting row such as 102 mm using decoupled charges is difficult but whereas continuous charging of the pre-split row in such hole yields better results. Among different approaches of continuous charging (decoupling, explosive mixing) decoupling due to its operation difficulties of small diameter holes (102 mm) was rejected by Jimeno et al.

Near fault zones addi- Production schedule requires every blast to be as large as possible. However, size of the blast has to be optimized within the confines of production requirement and wall damage. e. presplitting has been applied at RAM. The theory of pre-splitting is that when shock waves from simultaneously detonating charges in adjoining blast holes collide, tension occurs in the rock, forming a crack in the web between the holes. Firouzadj et al. (2006) concluded that that small diameter holes in pre-splitting row such as 102 mm using decoupled charges is difficult but whereas continuous charging of the pre-split row in such hole yields better results.

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