Abstract: China's large and mediumsized metallurgical openpit mines have entered the middle and late stages of mining,and gradually moved from shallow to deep.Most of the pioneering transportation methods are mainly based on automobile transportation.They will face long distances,low vehicle efficiency,and high operating costs.Restricting the development of mining enterprises.In order to explore the best spatiotemporal connection of an automobiletoautomotive beltdischarge rock removal transport system in an openpit mine,combined with the current status of a largescale openpit mine rock removal transport system in China,based on the rock formation schedule prepared by the mining enterprise,two types of transportation systems have been established the model of the cost of rock rowing operation draws on the rock rowing costs of similar mine belt transportation systems,calculates the rock rowing costs of the two rock rowing systems,and then uses the method of comparing projects with or without to establish a mathematical model of incremental investment profit indicators,which are obtained separately.Incremental investment profit indicators for each case,the obtained data are listed in the same table and the maximum value of incremental investment profitability indicators is found through comparison.The maximum point is the optimal time and space of automobiletoautomotive beltdischarge rock transportation system.

Key words: Openpit mine,Schedule of rock formation,Project comparison method, Profit index,Timespace connection point