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| SOME MEASURES OF LOWERING BOULDER YIELD IN LONG-HOLE BLASTING OF OPEN PITS |
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| DOI： |
| KeyWord:Open pit,Long-hole blasting,Boulder yield,Blasting parameter |
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| Abstract: |
| To lower the blasting boulder yield is an important technical consideration in designing rock blast program.Based on the analysis of situation and causes on which the blasting boulder occurs in borehole blasting of open pit,the paper determined some measures of lowering boulder yield of borehole blasting operation in mining open pits by taking explosive specific charge,blasthole spacing pattern,charge structure,stem length,millisecond interval and detonating into design of blasting program.The blasting with the controlling measures resulted in very satisfied effects in practice. |
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