Abstract:With the development of computer technology and issue of digital mine, the perfect combination of the three dimensional visualization ore deposit simulation technique and open pit limit optimization methods makes its working procedure simple, and a good dynamic effect may be obtained. Taking a phosphate ore as an example, 3D solid model of this 4th mining area is established by adopting the 3DMINE software system. It can reflect a more precise and entity model shape of deposit and working face with its distributing relationship imaging at the established ore body model the works of the grade estimation reserve calculation and so on. The study on the open pit boundary optimization of the phosphate mine is implemented based on Lerchs-Grossman optimization method to determine reasonable open pit boundary optimization parameters through referring to mining handbook and project experience, then a superior and economical open pit boundary of the mine is finally achieved. The results can be used to guide the resource development and investment decisions of the mine in earlier period and also provide a reliable basis for the arrangement of production plan and the real-time dispatch control in the later period. Through Study, the main techniques and method applied in open-pit boundary optimization are summarized.