Demanson Ornansah Sinaga; Novandri Kusuma Wardana; Erry Sumarjono. Analysis of the Use of 80% Waste Oil in Products HiMEX70 on the Quality of Blasting Results at PT Petrosea Jobsite Kideco Jaya Agung East Kalimantan. Prosiding Seminar Nasional ReTII 2023, 18, 223-228.