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Title: $Optimization of rational mining boundary and condition between open-pit and underground
Abstract: This paper focuses on analysis of the pressure of phosphate open-pit mining,and the key issues of Wengfu phosphate mine open pit to underground mining,through use non-waste mining theory,optimize the economic stripping ratio,as well as comparisons to determine better the open and underground reasonable mining areas and conditions.Conclusion of the study should be reference for the similar open-pit mine.