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A STUDY AND PRACTICE OF LARGE SCALE AND MULTIPLE ROW MILLISECOND BLASTING IN OPEN PIT IRON MINE

Liao Xiankui(Changsha Research Institute of Mining and Metallugy)Li Mingjian(Nanfen Iron Mine of Benxi Iron & Steel Company)  
This paper discusses the reasonable scale of massive multiple row millisecond blasting, approaches to improving fragmentation quality,and options for reducing vibration by asynchronous zoning initation with large scale interference,Production tests of 8 large scale millisecond blasts showed good results,such as reducing boulder percentage by 83%, vibration by 28.6%with toe rock dispeled.
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