Evaluasi Teknis Geometri Peledakan terhadap Fragmentasi Batu Gamping di PT. Indocement Tunggal Prakarsa Tbk Desa Palimanan Barat, Kecamatan Gempol, Kabupaten Cirebon, Jawa Bara

PT. Indocement Tunggal Prakarsa Tbk is a producer
engaged in limestone mining, which is located in the village of West
Palimanan, Gempol District, Cirebon Regency, West Java. The
mining method used by PT. Indocement Tunggal Prakarsa Tbk is an
open pit mining system, using the Quarry mining method. From the
results of the author's observations at PT. Indocement Tunggal
Prakarsa Tbk saw a lot of fragmentation resulting from blasting
which resulted in boulder. The size of the boulder based on company
standards is 50 cm with the percentage of rock fragmentation
resulting from blasting 50 cm at PT. Indocement Tunggal Prakarsa
Tbk is still relatively high at around ± 30%, while the fragmentation
expected by PT. Indocement Tunggal Prakarsa Tbk < 50 cm with a
blast yield of 80%. This study aims to design the optimum blasting
geometry to reduce the percentage of boulder so that the jaw crusher
specifications are met and do not increase the cost of renting the
breaker unit again. The research method is carried out by providing
the results of the analysis of the Kuz-Ram method. Then one of the
proposed geometries is chosen which is better while the proposed
geometry is given, namely Burden 2 m, Spacing 2.5 m, Stemming
2.2 m, Subdrilling 0.19 m, Level height 5,8 m, Depth of the blast
hole 6.68 m, Powder column 4.4 m, Powder factor 0.59, Kuzram
Fragmentation 20 %.