Study On Optimum Of Cutoff Grade In Underground Mine

Cutoff grade is the critical grade on compartmentalizing mineral and mullock. The choice of the cutoff grade will affect the configuration of the mineral, the reserves of the mineral, the producing scale of the mine, the producing life-span and the plan of mining. At the same time, it will also affect the utilization of non-renewable resources. Therefore, the optimization of the cutoff grade is extremely important in practical application. Its determination relates to complex analysis and calculation, and it has close relationship with other scientific knowledge such as business management, geology, mining, mineral processing, applied mathematics, computer technology and so on. In this paper, we research the optimization of the cutoff grade, relating with the theme "cutoff grade optimization study", which is one issue of the international cooperative project, named" Zambia-efficient than the West copper mining methods research," the main content and research results are as follows:(1) On the base of the fact that the profit and loss balance method has been successfully applied in the open-pit mine, Relating with the actual process of mining, We establish the corresponding optimized model of the cutoff grade. And, considering the optimization of the present value as the greatest goal, then we establish a mathematical model which can be used to describe the joint process between underground mining and beneficiation, and we also depict the algorithm steps and the flow chart of the model.(2) Collating and statistically analyzing the data of the Copper-than on the West, We find out the calculating method of the reserves and the average grade.(3) Giving an example about the Copper-than to the West, from which we collect the data and calculate them with the profit and loss balance method and the largest present value method. Then we achieve two optimum results, and compare and analyze the two results.