Abstract
Drilling and blasting activities in PT. Semen Bosowa Maros quarry aims to dismantle limestones of the host rock with fragmentation expected size of ≤100 cm, considered the maximum size of rock crusher receive opening. The drilling pattern used is a staggered pattern, while the blasting pattern used is a blasting streak pattern, with the ignition of one line and straight lines of the one between the next line. Based on observations in the field, the boulder that came from the blasting activities are relatively high at 20.63 %. To reduce the resulting chunks of the rock blasting activity, it’s important to change the geometry of the blasting base formulation expressed by R. L. Ash, thus changing the distance to 3.1 m; spacing to 3.7 m; stemming height to 3.14 m; bench height to 5.80 m and depth of blasting hole to 6.10 m. With the new blasting geometry, lump-sized rocks >100 cm generated from operating activities actual blasting theoretical calculations amounting to only 14.82 %.
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