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There are 36 open pit mines in the 1-10 Mt/a category, accounting for 44.4% of the total number of mines but only 30.08% of the output contribution, which is lower than the average level. There are 24 mines (29.6% of the total) with a production capacity of 0.3-1 Mt/a, contributing only 2.78% to the output, which is much lower than the average level. Five mines (6.2% of the total) have a capacity of less than 0.3 Mt/a, with an output contribution of less than 0.1%. There are 16 open pit mines with positive output contributions, all of which have a production capacity of more than 10 Mt/a, and for which the output contribution is as high as 67.06%. Based on the comprehensive comparison, it can be seen that the production capacity level of open pit mines is seriously polarized. The low contribution rate of mines with a production capacity of less than 10 Mt/a affects the average mining level. The lower the production capacity, the more obvious it is. Therefore, it is necessary to speed up the closure of open pit mines with a production capacity of less than 1 Mt/a.