Abstract: The orebody in the second orebody of Huashugou mining area is thin,and the orebody is very irregular.The shortcut mining route is perpendicular to the direction of the orebody,and the ore recovery rate of the current drawing mode (cutoff grade) is low and can not reach the planned value,the main reason is that the drawing mode does not match with the stoping technology.According to the principle of ore drawing and the difficulty degree of ore recovery,the combined ore drawing mode is put forward,in which the residual area in the footwall is controlled by the total amount of ore drawing,the required recovery rate is 85% ,and the middle part is mined by the cutoff grade,it is required that the ratio of the surrounding rock of the Zhangzi face should be controlled within 40.00%.The ore drawing model has been applied in other orebodies of Jingtieshan mine more mature,"loose ore" to achieve blasting compensation space can be.In order to prove the rationality of the above ore drawing mode,the laboratory ore drawing study was carried out.The comprehensive recovery rate reached 81.48% and the dilution rate was 10.00%.Through 4 years'practice,good results have been achieved in 2 865~2 835 m of orebody II in huashugou mining area.

Key words: Caving method, Combined drawing, Recovery rate, Ore drawing mode, Cutoff grade, Ore recovery rate