Experience of Drilling-and-Blasting in Diamond Fields in Yakutia
S. V. Kovalevich1, I. V. Zyryanov1,2, V. I. Chernobay3
1Yakutniproalmaz Institute, ALROSA, Mirny, Russia
2Polytechnical Institute, Ammosov North-Eastern Federal University, Mirny, Russia
3Saint-Petersburg Mining University, Saint-Petersburg, Russia
Keywords: Mine, open pit mine, kimberlite ore, explosive rupture, detonation velocity, slot raise, grain size composition, stemming, locking arrangement, charge formation, impact wave attenuation, radial clearance, holding device, wet boreholes
Abstract
The article describes semi-commercial testing of different technologies and facilities which ensure the required level of mining efficiency and quality of diamond-bearing ore. The use of the column charge explosives with radial clearance and air-split emulsion explosives allows stress state control in rock mass and reduces zones of high risk of crystal damage. The chain charge explosives appear to be a clever engineering idea for difficult mining conditions. The authors review the modern methods of drilling-and-blasting at mining sites of ALROSA.
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