PT. Bukit Asam (Persero), Tbk is one of the companies engaged in coal mining. For stripping interburden in Mine Air Laya with drilling-blasting is done in cooperation with PT. Pamapersada. Geometry blasting average actual applied by PT. Pamapersada is burden by 7 meters and spaced 8 feet. Geometry will affect the degree of fragmentation of rock blasting results. Fragmentation results of size di…