Abstract: Taking the ore drawing of non-pillar sublevel caving method as the research object, the ore drawing mode of low dilution ore drawing and cut-off grade ore drawing are simulated by adopting PFC2D, the ore recovery rate and waste rock mixing rate are regarded as the comparitive indices so as to analyze the simulation results. According to the analysis results, the low dilution ore drawing is capable of improving the ore recovery effect, so it is more resonable than the cut-off grade ore drawing.

Key words: PFC programme, Low dilution oredrawing, Cut-off grade ore drawing