某大型露天矿山境界优化工程实践#br#

露天矿山受边坡滑坡、崩落、变形失稳、泥石流、塌陷等地质灾害影响或受矿石产量需求及价格变化影响需要调整剥采比，采、选、冶技术的进步导致矿石品位发生大的变化，一些大型露天铁矿山在中后期的生产过程中不可避免地存在不适应该矿山初步设计的情况，势必需要开展境界优化工程加以修正而获得必需的安全保障和良好的经济效益。以我国某大型露天铁矿山为例，从资源、安全、经济、组织技术等方面分析了开展境界优化的必要性，总结了境界优化一般应遵循的安全、资源合理回收、经济等原则，并对境界优化前后结果进行了对比，同时对该矿山在境界优化实施过程中遇到的问题及解决的措施进行了分析探讨，取得了预期效果，可供同类矿山参考。

Practice of Optimization Engineering for Large Open pit Mine Boundary

Open pit iron mines are affected by geological disasters such as slope landslides,caving,deformation instability,debris flow,collapse etc,or by ore production demand and price changes,the stripping ratio should be adjusted.The development of mining,mineral processing and smelting technology leads to great changes in ore grade.It is inevitable that some large open pit iron mines are not suitable for the preliminary design of mines in the middle and late stages of production,therefore,it is necessary to carry out the boundary optimization engineering to correct it so as to obtain the necessary security and good economic benefits.Taking a large scale open pit iron mine in China as an example,the necessary of boundary optimization of the mine is analyzed from the aspects of resources,safety,economy and organization technology,and the principles of safety,reasonable recovery of resources and economy should be followed in boundary optimization are summarized.The results before and after boundary optimization is discussed.At the same time,the problems encountered in the process of boundary optimizing the implementation of the mine and the measures should be solved are analyzed and discussed so as to provide reliable reference for similar mines.