نتایج جستجو برای: pit mine production planning

تعداد نتایج: 822641  

2014
Zhiqiang Yang Qian Gao Guangcun Zhang

Based on current researches and developments of open-pit mine slope in China, the engineering features of open-pit mine slopes are summarized. Mine slope is basically formed by dynamic excavation of multi-level and multi-type, and mining benefit is the purpose of mine slope engineering when using various schemes and/or methods. Thus, the issues of design and stability analyses are the main conc...

Journal: :European Journal of Operational Research 2017
Barry King Marcos Goycoolea Alexandra Newman

A large number of metal deposits are initially extracted via surface methods, but then transition underground without necessarily ceasing to operate above ground. Currently, most mine operators schedule the open pit and underground operations independently and then merge the two, creating a myopic solution. We present a methodology to maximize the NPV for an entire metal deposit by determining ...

One of the key issues in mining is the hauling system. Truck and shovels are the most widely used transportation equipment in mines. In this paper, a two-phase simulation-based optimization is presented to maximize utilization of hauling system in the largest Iranian open-pit copper mine. In the first phase, The OptQuest for Arena software package was used to solve the optimization problem to p...

Journal: :Computers & OR 2010
Andreas Bley Natashia Boland Christopher Fricke Gary Froyland

We present an integer programming formulation for the open pit mine production scheduling problem. We strengthen this formulation by adding inequalities derived by combining the precedence and production constraints. The addition of these inequalities decreases the computational requirements to obtain the optimal integer solution, in many cases by a significant margin. & 2010 Elsevier Ltd. All ...

2009
Felipe Alvarez Jorge Amaya Andreas Griewank Nikolai Strogies

This paper proposes a new mathematical model for the open pit mine planning problem, based on continuous functional analysis. The traditional models for this problem have been constructed by using discrete 0−1 decision variables, giving rise to large-scale combinatorial and Mixed Integer Programming (MIP) problems. Instead, we use a continuous approach which allows for a refined imposition of s...

Journal: :Mathematics 2023

The strategic planning of open pit operations defines the best strategy for extraction mineral deposit to maximize net present value. process must deal with several sources uncertainty; therefore, many authors have proposed models incorporate it at each its stages: Computation ultimate pit, optimization pushbacks, and production scheduling. However, most works address level independently, few a...

2007
O. K. H. Steffen

Mine planning is a typical engineering design function which integrate the disciplines of geology, metallurgy, geotechnics, mining and economics. The numerous uncertainties associated with geological understanding, the exposure of people to potential hazards in the work place and the need to provide a specific dollar outcome, requires a proper assessment of the risk. This paper identifies the s...

One of the most effective parameters in economics of open-pit mines is the pit slope angle, so that the slope angle more than the optimum value increases the probability of a large failure in the pit wall and the slope angle less than the optimum value leads to increasing stripping ratio and reducing net present value of mine. Therefore, in this paper, considering the limit equilibrium methods ...

Theoretical review of ‘mining pit lakes’ indicates that like natural lakes such lakes display a huge diversity. They are typically in a non-equilibrium state with respect to their surroundings. Hence, at the decommissioning phase of mining operation a detailed technical study are required on different aspects of such created water bodies considering its morphometry, geology, hydrology, water qu...

Journal: :Math. Meth. of OR 2011
Felipe Alvarez Jorge Amaya Andreas Griewank Nikolai Strogies

This paper proposes a newmathematical framework for the open pit mine planning problem, based on continuous functional analysis. The main challenge for engineers is to determine a sequence of nested profiles maximizing the net present value of the mining operation. The traditional models for this problem have been constructed by using binary decision variables, giving rise to large-scale combin...

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