Abstract: The pillarless sublevel caving method is widely used in the mining of underground metal deposits. Large loss and dilution is one of its main problems. The existence of ore remant has a great influence on the ore drawing effect,which directly affects the loss and dilution in the mining process. In order to obtain a good mining index,it is necessary to study the composition,spatial location and morphology of the ore remnant. In view of the lack of complete disclosure means in the current research on the ore remnant,firstly,based on liquid injection cementation,a method for completely exposing the ore remnant inside the ore body after ore drawing is proposed. Secondly,the physical model drawing experiment of pillarless sublevel caving method with vertical approach arrangement is carried out. The ore remnant is completely exposed by the proposed method and three-dimensional modeling is carried out by three-dimensional scanner. On this basis,the composition,spatial position and shape of the ore remnant are revealed. At the same time,the variation law of the mixed part of ore and rock and the ore remnant on the wall with drawing is studied. The proposed method makes up for the deficiency of the traditional ore drawing simulation experiment. On this basis,the characteristics and laws of the ore remnant are revealed,which is more conducive to guiding the formulation of mining measures.

Key words: caving method,ore remnant,liquid injection cementation,three-dimensional configuration