Research On The Ultimate Boundary Optimization Of Open Pit Mine Based On The Concept Of Sustainable Development

In the context of sustainable development,how to reduce the impact on the ecological environment as much as possible while acquiring the mineral resources required for human social development,and to create as much social benefits as possible,to truly realize the coordination of economy,ecology and society is a topic that must be paid attention to by mining technicians and decision makers in mineral development today and in the future.For open pit mining,the ultimate boundary is the primary link in the design of a mining plan and an important basis for decision-making in mining operations.In view of this,this article focuses on three core elements of the concept of sustainable development:economic,ecological and social construction of economic benefit evaluation models,ecological cost calculation models and social benefit quantification models.From the perspective of different interest groups,the impact of the three major factors of economy,ecology and society on the ultimate boundary design of open-pit mine is studied.Taking Sijiaying Iron Mine as an example,a total of 23 geologically optimal candidate boundaries were generated using the MetalMiner software based on the cone exclusion method.The evaluation and analysis of the economic benefits,ecological costs and social benefits of each candidate boundary show that the optimal boundary obtained under different considerations,whether it is the ore content,mining range,and mining depth,are quite different.When economic factors are considered separately,the boundary profit value increases first and then decreases with the expansion of the boundary scale.The optimal economic benefit is the boundary 21;when ecological factors are considered separately,the loss of boundary ecological value increases rapidly with the expansion of the boundary scale,the optimal boundary of ecological benefits is the minimum boundary 1;when social factors are considered separately,the social benefits of the boundary gradually increase with the expansion of the boundary scale,and the optimal boundary of social benefits is the maximum boundary 23.In the ultimate boundary design of the open-pit mine,the three elements of economy,ecology and society interact and influence each other.When only economic factors are taken into consideration,after the profit of the mine increases to a certain extent with the scale of the open-pit mine,the incremental speed of the stripped waste rock is greater than the increase of the mined ore due to the increase of the border.When the economic benefits from incremental ore mining are insufficient to offset the costs of ore mining,the profit value begins to decline(the optimal boundary is 21);as the scale of the open-pit mine increases,the ecological environment is more severely damaged,that is,ecological factors tend to change the ultimate boundary of the open-pit mine small(the optimal boundary is 1),so when considering both economic and ecological factors,the optimal boundary is between economic and ecological optimal boundary(boundary 10);however,the social benefits generated by mining are more obvious and more effective in solving employment,driving related enterprise development,increasing social welfare,and increasing government fiscal revenue,which means that social factors tend to make open-pit mine ultimate boundary becomes larger(the optimal boundary is 23),so when considering the three economic,ecological,and social factors that affect the sustainable development of a mine,The optimal boundary is 20.With the continuous penetration of the concept of sustainable development in the field of mineral development,optimizing the ultimate boundary of the open-pit mine based on any factor is no longer in line with the development trend of the world today,and the boundary obtained is no longer the optimal boundary,or even unreasonable boundary.Therefore,in the context of sustainable development of mine,the ultimate boundary of open-pit mine should be the best boundary of comprehensive benefits after comprehensive consideration of economic,ecological and social factors.