关键词: 露天矿, L-G法, DIMINE软件, 三维建模, 境界优化

Abstract: Open pit limit optimization is an important link in open pit design, production and operational management.However, the final limit optimization is a complicated work involving an integrated consideration of mine resource conditions, mining technical condition, mineral sales price, ore mining and processing cost for maximizing the economic benefit.At present, the perfect combination of the three dimensional visualization ore deposit simulation technique and open pit limit optimization methods makes its working procedure to be simple, and a good dynamic effect may be obtained.Taking Pingguo bauxite in Guangxi Province as a case, 3-D solid model of this open pit mine was established by adopting the DIMINE software system.It can reflect a more precise and intuitionistic spacial shape of deposit and working face and its distributing relationship.Aiming at the established ore body model, the works of the grade estimation, reserve calculation and so on were carried out.The study on the open pit limit optimization of the bauxite mine is made based on Lerchs-Grossmann optimization method to determine reasonable open pit limit optimization parameters through referring to mining handbook and project experience.Then a superior and economical open pit limit of the mine was achieved finally.It 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.

Key words: Open pit mine, L-G method, DIMINE software, Three-dimensional modeling, Pit limit optimization