Technical Study of Reducing Ground Vibration Levels on Overburden Blasting Activities in East Pit PT. Bungo Bara Utama Jobsite Kuansing Inti Makmur, Bungo District, Jambi Province

PT. Bungo Bara Utama is a coal mining company that uses the open-pit mining method. Dismantling of overburdens in the form of sandstone and clay stones using ANFO explosives. Drilling and blasting are effective means of demolition activities. This method aims to unload the excavated material from the source rock and move the crushed excavated material into a pile of material ready to be loaded into the transportation means. When the explosion occurs, not all of the energy produced is used to form rock fragments. Some energy is continued in the rock mass in waves after this, referred to as seismic waves. Seismic waves due to blasting are felt as ground vibrations (Ground Vibration). PPV is the maximum speed used in measuring the magnitude of vibrations in a location depending on the distance from the location of the explosion and the number of explosives used per period. It can be concluded that to get an optimal filling with a PPV value ≤ of 0.8 mm / s for a distance of 500 m, fill in the contents ranging from 5.78 kg to 5.98 kg, with a distance of 1000 m with entries ranging from 22.93. kg to 23.94 kg, with a distance of 1300 m is the amount of stuffing ranging from 38.61 kg to 40.45 kg, while for a distance of 1500 m, the amount of stuffing starts from 51.31 kg up to a maximum filling of 53.86 kg.