PT. Berau Coal is known as a mining company engaged in the coal industry. In coal production, it is necessary to dismantle overburden by drilling and blasting. The standard of blasting operation in Pit E Blok 7 Binungan Mine Operation 2 is fragmentation ≤50 cm produced more than 60% and powder factor 0,21 kg/bcm. The drilling methods used are single rod and double rod. Based on field observat…