Open-pit Mining Boundary of a Big Uranium Deposit Based on L-G Graph Theory
In view of the situation that it is not suitable to use all underground mining or all open pit mining for a large uranium deposit,it is necessary to optimize the open pit mining limit.Through comparison and analysis of the traditional boundary determination method and the optimization method based on block model,the L-G(Lerchs-Grossman)graph theory method is selected to optimize the open pit mining boundary.Then,the lithology model of the deposit is established by using the implicit modeling method,and the slope stability analysis is carried out on the basis of this,and the optimal slope angles in different areas are determined.At the same time,on the basis of establishing the block model of the deposit,the sensitivity analysis of the deposit mining loss rate and dilution rate is carried out,considering their influence on the total value and stripping ratio,combined with the production and mining technology to determine the deposit loss and depletion index,and on this basis,the open-pit boundary optimization is carried out.Finally,by adjusting the price factor,the change trend of open-pit mining limit is obtained.Based on this,three kinds of open-pit mining limits are put forward,and the final open-pit mining limits are determined by analyzing the mining index.
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