Blasting worker Tran Van Hao, from Nghi Loc district, Nghe An province, said that the process of putting explosives into the mine hole must be done carefully, in which the worker must check the mine hole again, peel off the stone powder inside to make sure the mine hole is free of obstructions, then insert the bamboo strip with the explosive and detonator into the hole. Each different geological type will have a different way of loading explosives, so it must be calculated to adjust promptly during the loading process.