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blasting mining engineering bench blasting velocity burden blast design blast optimization drilling data acquisition system vod mate hand trap electric probe sonic velocity cj plane shock wave coaxial cable tdr chronograph slifer system d'autriche method velocity of detonation detonation explosives thermal precipitation gravimetric dust sampling boundary ventilation system central ventilation system environment mine ventilation dense medium separation gravity concentration mineral processing shovel-dumper open-pit rosin rammler distribution granulometry particle size distribution rock fragmentation opencast openpit mining explosive energy utilization dynamic response of rock mass heave energy high speed motion analysis high speed videography