Ore Grade Control Blending in Open-pit Mine Based on Mixed Integer Programming
Received date: 2018-10-08
Revised date: 2019-02-22
Online published: 2019-07-09
Rational planning and management of ore quality is an important issue to improve the resource and economic benefits of the mine.Resources and quality control of ore should be run through all aspects of the entire production management process.In order to solve problems existed in ore blending for open-pit mine，such as long-time ore blending，low accuracy of planned results and not associated with truck dispatching system，the open-pit mine automation ore blending system was proposed.It is based on Mixed Integer Programming and would make the ore grade control in open-pit mine more accurately and rapidly，so rational mining and fine control of production targets for the open-pit mine automation ore blending would be achieved.It was put forward based on the current status quo of stope，exploration engineering data and resource model，on the premise of production quality control，and mixed integer programming algorithm is used as the theoretical method.This paper taking a large limestone open-pit in Anhui Province as research object.In the first place，thiessen polygon method was applied to estimation value and divide the ore blending model based on rock sample of blasthole and mine block model.Then a mixed integer programming model was presented according to the special ore blending requirements of muck piles in open pit mineto solve the optimization problem of ore blending.The model takes the minimum fluctuation of the ore grade as the objective function，and takes into account a variety of constraints，such as the muck sub-piles mining constraint，vehicle dispatching manner constraint，shovel car mining constraint，number of shovel car in each pile constraint，maximum grade of ore dumping constraint，minimum grade of ore dumping constraint .At last，the automatic ore distribution system of open pit mine is established based on iMine spatial database technology with C++ language programming in Visual Studio 2012，by solving the mixed integer programming model of open-pit ore blending by IBM ILOG CPLEX Optimization Studio， the open-pit ore blending optimization scheme of mine and truck dispatching can be achieved.The method was applied to Quanjiao Conch limestone mine，several months of practical application proved that this model is scientific and feasible.The ore blending method can output result in 1 s，and the maximum deviation of each index of ore blending fluctuates from the target value within the range of 1.5%，the average deviation of each index from the target value is less than 0.2%，and the coefficient of variation is less than 1%.It meets the requirement of mine grade deviation control，so it is of important significance for guiding the actual production of open-pit mine.
Hongjian TU , Liguan WANG , Xin CHEN , Zhuli REN , Ju ZHANG . Ore Grade Control Blending in Open-pit Mine Based on Mixed Integer Programming[J]. Gold Science and Technology, 2019 , 27(3) : 458 -465 . DOI: 10.11872/j.issn.1005-2518.2019.03.458
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