Institute of Mining, Far Eastern Branch, Russian Academy of Sciences, Khabarovsk, Russia

An. A. Galimyanov, Leading Engineer at Rock Fracture Sector
E. N. Kazarina, Junior Researcher at Rock Fracture Sector, kazarinaen@mail.ru
V. I. Mishnev, Junior Researcher at Rock Fracture Sector

AVT-Amur LLC, Blagoveshchensk, Russia

A. Yu. Plotnikov, Deputy Chief Engineer, Candidate of Engineering Sciences

Vast practice of blasting proves stemming improves quality of explosions. At the same time, experience of some open pit mines doubts need of stemming as one of the main factors of blasting efficiency and, accordingly, justifies waiving stemming off. Aimed to specify efficiency of stemming, the Institute of Mining, FEB RAS performed experimental blasting at the open pit of the Malomir Mine. The test blocks were divided into two parts for blasting with drill cutting stemming in one part and without stemming in the other part. Efficiency of stemming was estimated in terms of the flying-off height of explosion products in a certain time interval, and also by calculation of the interval emission velocities of dust and gas products with the further adjustment of the results by means of the stopwatch study of the rate of broken rock loading in dump trucks. The studies on the efficiency of drill cutting stemming, with the evidence of the graphical analysis data on the interval flying-off velocities of explosion products from blastholes to a certain height, confirmed by the stopwatch results of excavator capacity give no credence to the relevance of drill cutting stemming in the actual geological conditions and at the current blasting design in block no. 3 of Center site on Level of 455–450 m at the Malomir Mine.

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