Abstract: Production scheduling has a profound influence on the overall economic benefits of the mining enterprise， and the manual technology has difficulty to meet the needs of mine. To improve the efficiency and rationality of scheduling， we studied the non-pillar sublevel caving method， and presented a mixed integer programming (MIP) model. This model makes minimum fluctuations of ore grade as the objective function， and it contains the whole process of mining to ensure all procedure could be more reasonable connected. In the test of the production scheduling of the Beiminghe iron mine， the results show that it spent shorter time and the procedure was more reasonable， what′s more， the results are better than the manual method. The study shows that this method can effectively improve the rationality of schedule and make the enterprise get more economic benefits.

Key words: underground mine, non-pillar sublevel caving method, production scheduling, mixed integer programming, minimum fluctuations of ore grade