Author(s)

D. Merabet & D. Mehif

Abstract

The process of the demolition of the rock with explosives is important in managing the quality of the extracted minerals. Improvement in the fragmentation can be obtained by variation of the following parameters: the specific consumption of explosives, the distribution, the inclination of the holes in the rock, the use of micro delays, the way the charges are built and the understanding of the geological properties of the massif. Practical results in the open pit mineral mines show that changes in the charges lead to a large variation in the fragmentation. This allowed some authors to state that "all the fragmentation problems are solved vraying the consumption of the explosives". The authors think that this hypothesis is not true for all kinds of rocks. The hole diameter influences the explosive's concentra

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