Optimization Study On Open Pit Mining Limit Of Miaogou Iron

Mining boundary delineation is the basis for the design of the open pit mineexploitation, and it is the precondition of deposit could be developed economically, safelyand efficiently. At present the optimization methods for open pit are generally for a singleopen-pit mine. About the combined mining to underground mining，Open-pit miningboundary and underground mining in space and time correlation research is seldom.Therefore, combined with typical MiaoGou open-pit to underground mining, the methodsof data field are researched and theoretical analyzed. Comprehensive analysis on miningand technical conditions to construct a three-dimensional realm optimization analysisplatform, then with the thought of open-pit to underground mining overall planning asguide, proposed a number of possible options of boundary optimization, at last make aoptimization based on fuzzy theory feasible solution method. The main contents include:1）On the basis of site investigation, analyzed the situation of the mine,summarizing engineering mechanics features of open-air rock and slope stability.2）According to the mine characteristics, the three-dimensional realm optimizationanalysis platform was built with the3D mine software.3）With the open pit to underground mining overall planning as the guidingideology, proposed four factors should be considered, given five open state solution.4）As the object to feasible programs of open pit mine, using fuzzy evaluationtheory of optimization, and ultimately confirmed the program3is the optimal solution.Open-pit mining boundary optimization method taking the overall planning fromopen-pit to underground mining as the guiding ideology is fully considered the continuityof open pit production period, transition period, underground production in three stages.This method is able to guarantee the open-pit and underground mining time enduninterrupted so that pen pit mining can coordinated with underground miningproduction. Finally, mine achieve a smooth capacity transition from open pit tounderground.