Due to its satisfactory effect during blasting, technical and detonation properties, and relatively low prices, ANFO explosive is mostly used in mining and construction works. In addition to the economic factor, other reasons for its frequent use are safety during blasting, ease of on-site production, and the possibility of filling boreholes by machines. The paper presents the measurements used to determine the influence of the diameter of the explosive charge and the thickness of the steel confinement on the detonation velocity of the ANFO explosive.