Installment boundary optimization of cross exploitation and inner dumping in the inclined coal seam narrow elongated open-pit mine

In order to optimize the mining boundary of the narrow and long strip open-pit using the cross exploitation and inner dumping mining procedure in inclined coal seam optimization,a method to optimize the state in different pe-riods is proposed,based on the principle of open-pit mining. Based on the changes of stripping logistic flow,the mining operation is divided into three periods,namely outside dumping,partial inside dumping,and inside dumping. Through the construction of location model related to each period of stripping,mining,and dumping,the authors analyzed the effect in the mining process from stripping logistic flow on the economic stripping ratio in different periods,revealed the relationship between the economic reasonable stripping ratio and the progress of the internal dumping line,constructed the fitting function of coal seam and rock wall thickness,explained the method of determining the optimal wall position of the profile by using the method of cyclic judgment,then the principle,application condition and optimization model of stage boundary optimization are given. This method is applied to the Shenxin Energy God Montenegro open-pit mine,and the result shows that the economic stripping ratio increased from 8. 06 m3 / t to 10. 54 m3 / t gradually. Com-pared with the original design,the level of economic recoverable reserves increased by 44. 95 Mt and the service life increased by 4. 26 a,achieving the maximum economic benefit of open-pit mining.