scholarly journals Method of Selecting Opening Cut Location Using Multi-Criteria Analysis of Decision Variant Mapping

Resources ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 112
Author(s):  
Zbigniew Kasztelewicz ◽  
Mateusz Sikora ◽  
Maciej Zajączkowski
Keyword(s):  
Surface Mining ◽  
Selection Procedure ◽  
Research Problem ◽  
Mine Planning ◽  
Decision Makers ◽  
Mathematical Tool ◽  
Environmental Groups ◽  
Mining Operations ◽  
Mining Projects ◽  
Selection Of

The aim of the article is to present a solution to the research problem that addresses the selection of the opening cut location in the surface mining method. Selecting the opening cut location is a strategic mine planning matter and has a key impact on the overall processes occurring during mining operations. This choice is a complex, and at the same time, mathematically ill-defined issue. The selection procedure should take into account many, often opposing, perspectives of the interveners, who represent the criteria laid down by the technical and organisational, economic, as well as social and environmental groups. In order to be able to compare criteria of a different nature, the authors implemented a multi-criteria method as a solution, derived from operational research. The mathematical tool best suited to the characteristics of the issue of selecting the opening cut location is a method from the ELECTRE family, which was used to create the final solution ranking. The main achievement of the method presented is the specification of a complementary group of assessment criteria and the application of a method allowing a solution to be created, which results in the selection of the most favourable decision variant. The developed method supports decision-makers responsible for making investment decisions in the implementation of mining projects.

scholarly journals Strategy in Dispatching Trucks and Shovels with Different Capacity to Increase the Operating Efficiency in Cao Son Surface Coal Mine, Vietnam

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Van Hoa PHAM ◽  
Trung Chuyen TRAN ◽  
Hong Anh LE ◽  
Thi Thu Hoa LE ◽  
Van Viet PHAM
Keyword(s):  
Coal Mine ◽  
Surface Mining ◽  
Operating Costs ◽  
Operating Efficiency ◽  
Mining Operations ◽  
Surface Coal Mine ◽  
Operation Costs ◽  
Low Efficiency ◽  
Match Factor ◽  
Selection Of

In surface mining operations, the operating costs of truck-shovel system constitutes 50-60% ofthe total. Only a little save in the operation costs in this system will bring large profit for the mines. Dueto many investment periods, the capacity of both trucks and shovels in Cao Son surface coal mine isdifferent. This leads to the low efficiency and the difficulty in dispatching strategy for the mine. Thispaper presents the current situation and selection of advanced dispatching strategy for increasing theefficiency trucks and shovels at this surface coal mine. The results show the detailed match factor reflectsthe state of each team of loader and trucks and should be use as the indicator for dispatching decision forthe heterogeneous truck and shovel fleet at Cao Son surface coal mine.

scholarly journals A Fuzzy-AHP Methodology for Planning the Risk Management of Natural Hazards in Surface Mining Projects

2021 ◽  
Vol 13 (4) ◽  
pp. 2369
Author(s):  
Philip-Mark Spanidis ◽  
Christos Roumpos ◽  
Francis Pavloudakis
Keyword(s):  
Natural Hazards ◽  
Fuzzy Ahp ◽  
Low Cost ◽  
Research Work ◽  
Surface Mining ◽  
Primary Source ◽  
Mining Operations ◽  
Planning Stage ◽  
Sustainable Planning ◽  
Mining Projects

Surface mining projects are vulnerable to natural hazards (earthquakes, floods, soil instabilities, and epidemic crises) which constitute the primary source of risks which affect the mining operations. In the framework of sustainable planning and development of such projects, the investigation of risk impacts is essential for taking the appropriate preventive measures before disastrous events appear in a mine. This paper proposes a methodology for the risk assessment of natural hazards in surface mining projects using the triangular Fuzzy Analytical Hierarchy Process (FAHP) for the determination of the probability of risk occurrence, combined with the Expected Value (EV) function, the Monte Carlo simulation, and the Program Evaluation Review Technique PERT method for making predictions of cost and time overruns. A case study of a hazardous event with impacts in the operations of a surface mine demonstrates the methodology as a flexible and low-cost tool for mining executives. This tool is useful in the planning stage of pre-disaster management projects in the mineral industry, considering mine sustainability views. The research work also investigates critical technical and economic aspects.

scholarly journals PEMANFAATAN DRONE UNTUK MONITORING AKURASI PERENCANAAN TAMBANG BATUBARA TERBUKA

2020 ◽  
Vol 1 (1) ◽  
pp. 181-190
Author(s):  
Jhony Jhony ◽  
Wildan Firdaus
Keyword(s):  
Coal Mining ◽  
Cross Section ◽  
Potential Problem ◽  
Data Retrieval ◽  
Mine Planning ◽  
Mine Design ◽  
Mining Operations ◽  
Design Plan ◽  
Mining Projects

ABSTRAK Pertambangan batubara di Indonesia telah mengalami pasang surut harga yang sangat fluktuatif sejak 2012. Hal tersebut berdampak langsung kepada para pelaku usaha pertambangan batubara. Oleh karena itu, efisiensi dalam proses pertambangan harus ditingkatkan termasuk dalam sisi perencanaan. Perencanaan yang baik dan akurat dapat memberikan banyak manfaat yaitu, peningkatan kualitas eksekusi dengan nilai stripping ratio yang optimum, tambang terbentuk rapi sehingga keselamatan kerja meningkat karena lereng terbentuk sesuai dengan desain serta meningkatkan utilisasi dan produktifitas alat. PT Pamapersada Nusantara merupakan salah satu kontraktor pertambangan batubara di Indonesia yang telah melakukan pengukuran akurasi perencanaan tambang sejak 2017 yang dikenal dengan nama MDA (Mine Design Accuracy). Nilai rata-rata MDA untuk proyek-proyek penambangan yang dikerjakan PAMA sejak 2017 hingga 2018 masih berkisar 91%, artinya masih ada 9% dari operasional yang diluar perencanaan baik yang berupa overcut maupun yang undercut dari desain awal. Untuk meningkatkan nilai MDA tersebut, dilakukan terobosan sistem monitoring operasional dengan bantuan drone. Bahkan drone tidak hanya dimanfaatkan untuk monitoring secara visual melalui video saja, tetapi juga digunakan sebagai alat ukur akurasi desain dalam bentuk orthophoto yang di-overlay-kan dengan desain dan cross section dari situasi hasil pemetaan menggunakan drone. Hasil video dari drone dilihat oleh pengawas tambang setiap hari dari sudut pandang yang lebih luas (helicopter view) dengan tujuan pengawas akan lebih jelas dalam menemukan deviasi dan dapat segera melakukan tindakan perbaikan. Hasil orthophoto yang di-overlay-kan dengan desain, dievaluasi secara mingguan oleh mine engineer untuk melihat posisi dan kelurusan tambang yang sedang dikerjakan apakah telah sesuai dengan desain perencanaan. Dan juga sebagai mitigasi terhadap potential problem yang akan muncul karena orthophoto dapat memberikan citra yang lebih jelas (real) dibandingkan hanya melihat kontur tambang. Sedangkan untuk cross section dari hasil situasi drone juga dapat dilakukan secara mingguan agar mine engineer dapat dengan cepat menginformasikan kepada pengawas di lapangan area mana saja yang sudah mendekati desain dan area mana yang masih harus digali. Setelah metode monitoring dan pengukuran menggunakan drone, nilai Mine Desain Accuracy meningkat menjadi 95% di semester 1 tahun 2019. Hal ini berarti pemanfaatan teknologi drone dapat membuat operasional pertambangan yang lebih efektif karena baik pengawas maupun mine engineer sama-sama dapat melihat situasi tambang dengan lebih luas dalam kondisi real. Selain efektif, drone juga dapat meningkatkan efisiensi kerja karena waktu yang dibutuhkan untuk pengambilan situasi lapangan yang berupa video hingga berbentuk data situasi sangat singkat dibandingkan dengan pengambilan data dengan metode lainnya. Kata Kunci: Mine Desain Accuracy, Drone, Stripping Ratio, Orthophoto, Cross Section  ABSTRACT Coal mining in Indonesia has experienced ups and downs in prices that have fluctuated greatly since 2012. This has had a direct impact on coal mining businesses. Therefore, efficiency in the mining process must be increased including in the planning side. Good and accurate planning can provide many benefits, improving the quality of execution with an optimum stripping ratio, the mine is neatly formed so the safety is increased because the slope is formed in accordance with the design and increases the utilization and productivity of production unit. PT Pamapersada Nusantara is a coal mining contractor in Indonesia who has measured accuracy in mine planning since 2017, known as MDA (Mine Design Accuracy). The average MDA for mining projects undertaken by PAMA from 2017 to 2018 is still around 91%, meaning that there are still 9% of operations that are out of planning both in the form of overcuts and undercuts from the initial design. To increase the MDA value, a breakthrough in the operational monitoring system was carried out with the help of drones. Drones are not only used for visual monitoring via video, but are also used as a measurement of design accuracy in the form of orthophoto that is overlaid with the design and cross section of the situation using the drone mapping results. The video results of the drone are seen by the mine supervisor every day from a broader perspective (helicopter view) with the aim of the supervisor being more clear in finding deviations and can immediately take corrective action. The orthophoto results that are overlaid with the design, are evaluated weekly by the mine engineer to see the position and alignment of the mine being worked on whether it is in accordance with the design plan. And also as a mitigation of potential problems that will arise because orthophoto can provide a clearer image (real) than just seeing the contours of the mine. Cross section of the drone situation results can also be done every week so that the mine engineer can quickly inform the field supervisor which areas are close to the design and which areas still need to be excavated. After monitoring and measuring methods using drones, Mine Design Accuracy increased to 95% in semester 1 of 2019. This means that the use of drone technology can make mining operations more effective because both supervisors and mine engineers can see the mine situation more extensive in real conditions. Aside from being effective, drones can also improve work efficiency because the time needed to capture field situations in the form of video to form data is very short compared to data retrieval by other methods. Kata Kunci: Mine Desain Accuracy, Drone, Stripping Ratio, Orthophoto, Cross Section

scholarly journals Consideration for declaring a Mineral Reserve for TSF mining projects

2020 ◽  
Vol 120 (9) ◽  
Author(s):  
S.M. Rupprecht
Keyword(s):  
Surface Mining ◽  
Mineral Resources ◽  
Normal Surface ◽  
Reserve Estimation ◽  
Mining Operations ◽  
Social Community ◽  
Hydraulic Mining ◽  
Modifying Factors ◽  
Mining Projects ◽  
Mineral Reserve

SYNOPSIS The mining of old tailings storage facilities (TSFs) or dams/dumps has become a common operation in South Africa. This practice has several interesting aspects that are different to normal surface mining operations. When considering the estimation of Mineral Reserves, the Competent Person must take into account the conditions of mining historical TSFs that are often situated in close proximity to communities. This paper discusses the Modifying Factors required to convert a Mineral Resource to a Mineral Reserve, such as mining sequence, dilution, mining losses, and environmental, social/community, and government factors. The paper also investigates the role that Inferred Mineral Resources may play in the life-of-mine plans for tailings dam projects. Keywords: TSF, tailings, hydraulic mining, Mineral Reserve estimation.

Identifying Measurement Invariant Item Sets in Cross-Cultural Settings Using an Automated Item Selection Procedure

Methodology ◽  
2018 ◽  
Vol 14 (4) ◽  
pp. 177-188 ◽  
Author(s):  
Martin Schultze ◽  
Michael Eid
Keyword(s):  
Measurement Invariance ◽  
Optimal Solution ◽  
Selection Procedure ◽  
Cross Cultural ◽  
Item Selection ◽  
Ant System ◽  
Item Quality ◽  
Ant System Algorithm ◽  
Selection For ◽  
Selection Of

Abstract. In the construction of scales intended for the use in cross-cultural studies, the selection of items needs to be guided not only by traditional criteria of item quality, but has to take information about the measurement invariance of the scale into account. We present an approach to automated item selection which depicts the process as a combinatorial optimization problem and aims at finding a scale which fulfils predefined target criteria – such as measurement invariance across cultures. The search for an optimal solution is performed using an adaptation of the [Formula: see text] Ant System algorithm. The approach is illustrated using an application to item selection for a personality scale assuming measurement invariance across multiple countries.

Combination of ribosome and phage display for fast selection of high affinity VHH antibody fragments

2019 ◽  
pp. 27-33
Author(s):  
YuE Kravchenko ◽  
SV Ivanov ◽  
DS Kravchenko ◽  
EI Frolova ◽  
SP Chumakov
Keyword(s):  
Phage Display ◽  
Selection Procedure ◽  
Free System ◽  
Phage Displays ◽  
High Affinity ◽  
Binding Domains ◽  
A Cell ◽  
Vhh Antibodies ◽  
Efficiency Of Selection ◽  
Selection Of

Selection of antibodies using phage display involves the preliminary cloning of the repertoire of sequences encoding antigen-binding domains into phagemid, which is considered the bottleneck of the method, limiting the resulting diversity of libraries and leading to the loss of poorly represented variants before the start of the selection procedure. Selection in cell-free conditions using a ribosomal display is devoid from this drawback, however is highly sensitive to PCR artifacts and the RNase contamination. The aim of the study was to test the efficiency of a combination of both methods, including pre-selection in a cell-free system to enrich the source library, followed by cloning and final selection using phage display. This approach may eliminate the shortcomings of each method and increase the efficiency of selection. For selection, alpaca VHH antibody sequences suitable for building an immune library were used due to the lack of VL domains. Analysis of immune libraries from the genes of the VH3, VHH3 and VH4 families showed that the VHH antibodies share in the VH3 and VH4 gene groups is insignificant, and selection from the combined library is less effective than from the VHH3 family of sequences. We found that the combination of ribosomal and phage displays leads to a higher enrichment of high-affinity fragments and avoids the loss of the original diversity during cloning. The combined method allowed us to obtain a greater number of different high-affinity sequences, and all the tested VHH fragments were able to specifically recognize the target, including the total protein extracts of cell cultures.

Advanced Systems to Prevent Collisions of Mining Equipment and Personnel Accidents in Surface Mining

2020 ◽  
pp. 24-29
Author(s):  
A.F. Klebanov ◽  
M.V. Kadochnikov ◽  
V.V. Ulitin ◽  
D.N. Sizemov
Keyword(s):  
Human Life ◽  
Surface Mining ◽  
Production Cycle ◽  
Mining Equipment ◽  
Mining Operations ◽  
Emergency Situations ◽  
Surface Mines ◽  
Technical Requirements ◽  
Personal Devices ◽  
Blind Spots

The article addresses the issues of ensuring safe operation of mining equipment in surface mining. It describes the main factors and situations that pose a high risk to human life and health. The most dangerous incidents are shown to be related to limited visibility and blind spots for operators of mining equipment, which can result in collisions and personnel run over. The main technologies and specific solutions used to design collision avoidance systems are described and their general comparison is provided. A particular focus is placed on monitoring the health of employees at their workplace by means of portable personal devices that promptly inform the dispatcher of emergency situations. General technical requirements are formulated for designing of the system to prevent equipment collisions and personnel run over in surface mining operations. The paper emphasizes the importance of introducing a multifunctional safety system in surface mines in order to minimise the possibility of incidents and accidents throughout the entire production cycle.

Analysis of the market of drill rigs for surface mining operations of the Russian mineral producers

2018 ◽  
Vol 138 (2/2018) ◽  
pp. 84-89
Author(s):  
K.Yu. Anistratov ◽  
T.V. Donchenko ◽  
P.I. Opanasenko ◽  
I.B. Strogiy
Keyword(s):  
Surface Mining ◽  
Mining Operations

A Soft Hierarchical Process Approach for Decision Making in A Supply Chain

2015 ◽  
Vol 4 (1and2) ◽  
Author(s):  
Rajeev Dhingra ◽  
Preetvanti Singh
Keyword(s):  
Decision Making ◽  
Process Approach ◽  
Decision Makers ◽  
Analytic Hierarchy ◽  
Conflicting Objectives ◽  
Realistic View ◽  
Hierarchy Process ◽  
Pair Wise Comparison ◽  
Supplier Selection Problem ◽  
Selection Of

Decision problems are usually complex and involve evaluation of several conflicting criteria (parameters). Multi Criteria Decision Making (MCDM) is a promising field that considers the parallel influence of all criteria and aims at helping decision makers in expressing their preferences, over a set of predefined alternatives, on the basis of criteria (parameters) that are contradictory in nature. The Analytic Hierarchy Process (AHP) is a useful and widespread MCDM tool for solving such type of problems, as it allows the incorporation of conflicting objectives and decision makers preferences in the decision making. The AHP utilizes the concept of pair wise comparison to find the order of criteria (parameters) and alternatives. The comparison in a pairwise manner becomes quite tedious and complex for problems having eight alternatives or more, thereby, limiting the application of AHP. This paper presents a soft hierarchical process approach based on soft set decision making which eliminates the least promising candidate alternatives and selects the optimum(potential) ones that results in the significant reduction in the number of pairwise comparisons necessary for the selection of the best alternative using AHP, giving the approach a more realistic view. A supplier selection problem is used to illustrate the proposed approach.

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