المؤلفون: Chaves, Leonardo Soares, Carvalho, Luiz Alberto, Souza, Felipe Ribeiro, Nader, Beck, Ortiz, Carlos Enrique Arroyo, Torres, Vidal Félix Navarro, Câmara, Taís Renata, Napa-García, Gian Franco, Valadão, George Eduardo Sales

المصدر: REM - International Engineering Journal. March 2020 73(1)

مصطلحات موضوعية: overall slope angle, direct block schedule, optimization, net present value

الوصف: The traditionally and widely used Lerchs-Grossmann algorithm presents well-known limitations that newer propositions attempt to overcome. The direct block schedule (DBS) methodology, which has gained relevance with computational advances, obtains the final pit as a natural result of production sequencing, different from Lerchs-Grossmann-based algorithms. This process flow applies constraints in the final pit definition stage attempting to provide a more realistic result and to minimize risks. Slope instability is a common and inherent risk to open pit mining and may affect the project's net present value (NPV). A study of the impacts of slope angle variations on safety indexes and final pit NPV provides an auxiliary tool for the overall slope angle definition process. This article presents a case study in which the effects of variations of the overall slope angle on the safety factor (SF) and project NPV were analyzed. A total of 25 pits were generated by each studied final pit definition methodology, and each pit had the sections with the varied slope angles analyzed in the stability assessment, resulting in a total of 150 slopes analyzed. A comparison between the results obtained by the two different methodologies implemented in commercial software is presented. The results show no relationship between the NPV and the overall slope angle using the DBS methodology. An analysis of the results for each geotechnical sector obtained by the traditional methodology was conducted and may contribute to the trade-off analysis between the best slope angle to achieve a reasonable SF and the maximum NPV.

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المؤلفون: Burgarelli, Hudson Rodrigues, Souza, Felipe Ribeiro, Nader, Alizeibek Saleimen, Torres, Vidal Félix Navarro, Câmara, Taís Renata, Ortiz, Carlos Enrique Arroyo, Galery, Roberto

المصدر: REM - International Engineering Journal. April 2018 71(2)

مصطلحات موضوعية: mine planning, mine scheduling, direct block scheduling, price simulation, Brownian motion

الوصف: Mineral projects are composed of geological, operational and market uncertainties, and reducing these uncertainties is one of the objectives of engineering. Most surveys assess the impact of geological and operational uncertainties on the mining planning. The objective of this work is to study the impact of market uncertainty on the mineral activity. The influence of iron ore price simulation on mining sequencing will be evaluated. The price of iron ore has random behavior that is best represented by the Geometric Brownian Movement system. This study analyzed the historical series of iron ore in order to determine the percentage volatility and drift. Traditionally, a constant and deterministic price is used for the ore mined in all periods of a mineral project. The direct block scheduling methodology was adopted because it is able to apply the appropriate financial discount factor to the simulated probabilistic price. The proposed methodology was able to quantify the market uncertainty.

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المؤلفون: Campos, Pedro Henrique Alves, Cabral, Ivo Eyer, Ortiz, Carlos Enrique Arroyo, Morales, Nelson

المصدر: REM - International Engineering Journal. April 2018 71(2)

مصطلحات موضوعية: mine planning, production scheduling, direct block scheduling

الوصف: Historically, since the 60's, traditional mine planning consists of several distinct stages: 1) Definition of the ultimate pit - the portion of the blocks that results in the greatest total value; 2) Pushback selection - based on the generation of nested pits, obtained with the change in the value of the ore price; 3) Long-term production scheduling. Although considered quite satisfactory, this methodology presents some flaws: The stages, even if considered individually optimal, may not be when put together. The opportunity cost is not considered and the cut-off is fixed. Due to the recent computational advances, a new technique has been growing and is more reliable: the direct block sequencing. In this methodology, the steps are consolidated into only one process, improving the economic results, reducing the total execution time and obtaining, in fact, an optimal planning. The aim of this work is to compare the results of the two planning methods applied in a database of a Brazilian iron ore mine and to show the real advantages and disadvantages of each one. To solve the direct block sequencing technique, Doppler was used, a tool developed by Delphos Mine Planning Laboratory, located at the University of Chile. The traditional methodology was executed through Whittle software. Lastly, a medium-term scheduling was performed using Deswik software.

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الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2018000200269Test

المؤلفون: Torres, Vidal Félix Navarro, Nader, Beck, Ortiz, Carlos Enrique Arroyo, Souza, Felipe Ribeiro, Burgarelli, Hudson Rodrigues, Chaves, Leonardo Soares, Carvalho, Luiz Alberto, Câmara, Taís Renata, Zanetti, Eunírio, Galery, Roberto

المصدر: REM - International Engineering Journal. April 2018 71(2)

مصطلحات موضوعية: deterministic mine planning, stochastic mine planning, direct block schedule, uncertainty

الوصف: Determination of the best possible ultimate pit for an open pit mine is a fundamental subject that has undergone a highly evolutionary process, reviewed in this study, since the correct choice carries substantial economic impact for the industry. The correct choice can be very beneficial for project analysis, whereas an incorrect choice has the potential to mask huge financial and economic future losses that could render a project unfeasible. The advent of computers in the 1960s allowed sophisticated analysis for the selection of the best ultimate pit determination, under specific modifying factors such as economic, social, environmental, and political, but only in deterministic situations, i.e., when the problem and variables for the ultimate pit determinations were considered deterministically and almost always based on average values. Techniques such as the Lerchs-Grossman algorithm and mixed-integer programming are among many standard tools now used by the mineral industry. Geological uncertainty and the associated risks as well as the need to consider the appropriate time to mine a block during a mine operation have a significant impact on the net present value of the resulting ultimate pits. Stochastic aspects embed a probabilistic component that varies in time and are now under intense investigation by researchers, who are creating algorithms that can be experimented with and tested in real mine situations. One can expect that once these algorithms demonstrate their efficiency and superior results, they will readily dominate the industry.

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الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2018000200289Test

المؤلفون: Souza, Felipe Ribeiro, Burgarelli, Hudson Rodrigues, Nader, Alizeibek Saleimen, Ortiz, Carlos Enrique Arroyo, Chaves, Leonardo Soares, Carvalho, Luiz Alberto, Torres, Vidal Félix Navarro, Câmara, Taís Renata, Galery, Roberto

المصدر: REM - International Engineering Journal. March 2018 71(1)

مصطلحات موضوعية: mine planning, scheduling, avidity optimization, simulated annealing, tabu search

الوصف: This study is focused on Direct Block Scheduling testing (Direct Multi-Period Scheduling methodology) which schedules mine production considering the correct discount factor of each mining block, resulting in the final pit. Each block is analyzed individually in order to define the best target period. This methodology presents an improvement of the classical methodology derived from Lerchs-Grossmann's initial proposition improved by Whittle. This paper presents the differences between these methodologies, specially focused on the algorithms' avidity. Avidity is classically defined by the voracious search algorithms, whereupon some of the most famous greedy algorithms are Branch and Bound, Brutal Force and Randomized. Strategies based on heuristics can accentuate the voracity of the optimizer system. The applied algorithm use simulated annealing combined with Tabu Search. The most avid algorithm can select the most profitable blocks in early periods, leading to higher present value in the first periods of mine operation. The application of discount factors to blocks on the Lerchs-Grossmann's final pit has an accentuated effect with time, and this effect may make blocks scheduled for the end of the mine life unfeasible, representing a trend to a decrease in reported reserves.

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الوصول الحر: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2018000100097Test