Parallel hole cut blasting tests with ANFO and emulsion explosives

• Cut blasting tests were performed in an open pit of a limestone mine. The goals were to confirm earlier experience in blasting parallel hole cuts with emulsion explosives, to obtain the relation betwern charge concentration and burden, and to obtain basic data for ANFO in rounds with 4m advance. The goals of the project have been reached; basic data for ANFO in 4m long rounds have been obtained and a design formula for parallel hole cuts which is useful both for ANFO and decoupled emulsion explosives has been found. Our experience of the requirements for obtaining good breakage in a four-section cut have been listed. In order to obtain a better design basis for parallel hole cuts, the effect of the following factor should be investigated: primarily the corperation of multiple relief holes and decoupling, and to some extent initiation delay and bad drilling.

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