By Ajoy K. Ghose, Akhilesh Joshi
Blasting practices in mines have gone through many adjustments within the contemporary 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 mixture which spotlight the evolving traits in blasting in mines. those diversity from distinctive options of solid blasting, purposes of seed wave modelling for more advantageous fragmentation, to layout of mass blasts and regulated blasting for balance of pit-walls. Blasting in Mines – New Trends can be of specific curiosity to mining and blasting engineers.
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Additional info for Blasting in Mining - New Trends
However, once it gets to the part of ring slashing blast, the initiation speed can be much faster in order to achieve better fragmentation. This initiation requirement, namely a slow initiation at the beginning followed by a faster and more precise timing, is exactly opposite to what pyrotechnic detonators can offer. Pyrotechnic detonators are generally more precise for short delay and less accurate for long delay periods. Electronic detonators are very accurate regardless the delay time for the purposes of muck movement consideration.
After over one year of testing and a vigorous Pre-Development Review (PDR), the system was then fully implemented. As a general practice, all production blasts are fired from surface via a telephone line. Application of such new technologies and the new mass blast principle were among the key factors for maintaining the production level at Mine-K when most of the mining activities are reaching over 3000 m below surface. THE EXPERIENCE AT MINE-L • Holes to clean after each blast until the final blast; • Caving in the slot; • Unable to blast all holes; • Large blocks in the stope • Back caving after the mass blast Obviously, all these problems cannot be addressed by drill and blast design alone.
Sonicity controls the relationship between detonation, fragmentation and vibration immission. For a constant amount of energy of a blast, a higher degree of fragmentation is accompanied with lower levels of vibrations. The new advanced blasting theory based on sonicity enables the blast engineer to design larger blasts without increasing unwanted vibrations while obtaining optimal fragmentation. 1 INTRODUCTION Bragg-grid based strain sensors, 3-component geophones and a 3-D-laser scanner [Mueller & Pippig 2011b].
Blasting in Mining - New Trends by Ajoy K. Ghose, Akhilesh Joshi