Roussos Dimitrakopoulos

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Cahiers du GERAD

96 results — page 5 of 5

G-2014-57
High-order simulation at block support scale
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The use of spatial high-order statistics has been previously proposed as an alternative to introduce richer information about complex spatial patterns in the...

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G-2014-58
Production scheduling under undertainty for an open pit mine using Lagrangian relaxation and branch-and-cut algorithm
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The production scheduling of an open pit mine determines the optimal extraction sequencing that significantly impacts a mine's life as well as net present va...

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G-2014-56
Optimizing mining complexes with multiple processing and transportation alternatives: An uncertainty-based approach
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Mining complexes contain multiple sequential activities that are strongly interrelated. Extracting the material from different sources may be seen as the fir...

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G-2014-40
Progressive hedging applied as a metaheuristic to schedule production in open-pit mines accounting for reserve uncertainty
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Scheduling production in open-pit mines is characterized by uncertainty about the metal content of the orebody (the reserve) and leads to a complex large-sca...

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G-2013-66
Geologic Heterogeneity Recognition Using Discrete Wavelet Transformation for Subsurface Flow Solute Transport Simulations
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Subsurface flow and solute transport simulations are performed using different scenarios of permeability fields generated from the sequential Gaussian simula...

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G-2013-60
An Efficient Algorithm for the LP Relaxation of the Maximal Closure Problem with a Capacity Constraint
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The classical maximum closure problem is of particular importance to the mining industry because it is the underlying formulation related to mine design and ...

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G-2013-59
An Integrated Approach to Mine Planning and Equipment Selection/Allocation
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This paper attempts to incorporate equipment selection/allocation into the optimization of open pit mine production scheduling. Equipment selection has been ...

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G-2013-62
High-Order Spacial Direct and Cross-Statistics for Categorical Attributes
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The characterization of the spatial continuity of categorical variables, such as geological units, is a longstanding subject in geostatistics. Indicator cova...

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G-2013-61
Surface Constrained Mine Production Scheduling with Uncertain Geology
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This paper proposes a stochastic integer programming (SIP) formulation to address the optimization of long-term mine production schedules, whereby the supply...

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G-2013-58
Multi-Point Geostatistical Simulation Based on a Quadratic Optimization Algorithm
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The spatial continuity of lithology and ore grade is one of the key factor for proper mine planning. Traditional geostatistical methods are used for spatial ...

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G-2013-64
On Tractable Markov Random Field Models and MapReduce Algorithms: Towards a Practitioner's Toolbox
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In the era of big data, data sets have been growing very large, and interest for algorithms and computation framework that handle such large scales is increa...

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G-2013-63
A network-flow based algorithm for scheduling production in multi-processor open-pit mines accounting for metal uncertainty
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This paper proposes a heuristic approach based on network flow techniques to schedule the production in open-pit mines, while accounting for metal uncertaint...

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G-2013-56
An Extended Stochastic Optimization Method for Multi-Process Mining Complexes
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Traditionally, mining engineers plan an open pit mine considering pre-stablished conditions of operation of the plant(s) derived from a previous plant optimi...

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G-2013-55
A Heuristic Approach to Stochastic Cutoff Grade Optimization for Open Pit Mining Complexes
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Cutoff grade specifies the available supply of metallic ore from an open pit mine for the multiple processing and refining streams of the corresponding minin...

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G-2013-54
Mining Supply Chain Optimization under Geological Uncertainty
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Mining operations can be modelled as a supply chain from the sources of raw material (mines) through various processing streams to the final saleable product...

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G-2013-57
High-Order Simulation with Clustered Datasets
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Preferential sampling of high grade zones is a common practice in the drilling campaigns of ore deposits. This may lead to a bias in the statistics derived f...

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