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This document discusses the challenges of oversize boulders and toes when using large-diameter blastholes for open-pit mining. It proposes a new blasting approach using combined blastholes of different diameters to address this issue. A non-ideal detonation model and statistical damage model are used in dynamic finite element analysis to simulate rock fragmentation and investigate the formation of oversize fragments. The analysis shows that pocket charges and satellite holes only improve top bench fragmenta

Author

Jennifer Gordon

Language

EN