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  • 1.
    Abrahamsson, Lena
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Johansson, Bo
    Johansson, Jan
    Future of metal mining: sixteen predictions2009In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 1, no 3, p. 304-312Article in journal (Other academic)
    Abstract [en]

    The world's metal mining industry faces a number of challenges which must be anticipated and managed wisely. The prevailing recession will force the industry to further rationalisations that require both new technologies and new organisational forms that supports both high productivity and good working conditions. Based on what was said at three international mining conferences, the authors of this paper present 16 predictions for the mining industry of the future. In one or another way the mining industry of today must address them all.

  • 2.
    Barba, Tomas Villegas
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nordlund, Erling
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Numerical analyses of the hangingwall failure due to sublevel caving: study case2013In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 4, no 3, p. 201-223Article in journal (Refereed)
    Abstract [en]

    The sublevel caving used in Kiirunavaara mine induces failure and subsidence of the hangingwall. Two sections of the mine were studied by means of numerical analyses. Numerical models were developed using finite element and discrete element codes. The former was applied to calculate the location of new failure surfaces in the hangingwall and to estimate the break angle when mining advances downwards. The latter was used to analyse the displacement path of the caved rock during draw and to determine its effect on the stability of the hangingwall and footwall. The models were calibrated using displacement monitoring data. The finite element analyses indicated that the break angle is almost constant for deeper mining levels but may change if the geometry of the orebody changes. The discrete element model showed the formation of a stationary zone along the footwall that reduces the magnitude of the shear forces during draw, increasing its stability.

  • 3.
    Hoseinie, Hadi
    et al.
    Shahrood University of Technology.
    Khalokakaie, Reza
    Shahrood University of Technology.
    Ataei, Mohammad
    Shahrood University of Technology.
    Kumar, Uday
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Reliability-based maintenance scheduling of haulage system of drum shearer2011In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 3, no 1, p. 26-37Article in journal (Refereed)
    Abstract [en]

    Drum shearer is the most important component of production chain in longwall mining. This machine is driven along the face by a powerful haulage system. In this paper, the reliability of haulage system of shearer has been analysed. The result showed that Time Between Failures (TBF) data of this system obeys the three-parameter Weibull distribution. On the basis of the achieved reliability model, the Preventive Maintenance (PM) scheduling has been suggested for different reliability levels. The reliability-based maintenance intervals for 90, 80, 70 and 50% reliability are 19.4, 35, 49 and 96.8 h, respectively. If 35 h are considered as the PM intervals, mean TBF will be increased by 16.2%.

  • 4.
    Idris, Musa Adebayo
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Saiang, David
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nordlund, Erling
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Probabilistic analysis of open stope stability using numerical modelling2011In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 3, no 3, p. 194-219Article in journal (Refereed)
    Abstract [en]

    A probabilistic approach is presented for the analysis of open stopestability. The approach considers the inherent variability and uncertainty whichare typical of rock mass properties. In this study, a series of numerical analyseswere performed using FLAC to study the stability of open stopes while takinginto account the variability in the rock mass properties. The rock mass wasdivided into six strength classes: three classes for the host rock and threeclasses for the massive sulphide ore. Each class was randomly distributed to theelements in the FLAC model. The host rock-to-massive sulphide ore ratio isenvisaged to have a strong influence on the stope. To verify this, three casesof different ore percentages were considered and the results compared.The results, which were presented as Probability Density Functions (PDFs),indicate that the zones of low stiffness show high range of displacements andthat the increase in the percentage of the ore significantly affects the stability ofthe stopes.

  • 5.
    Johansson, Bo
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Johansson, Jan
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    The new attractive mine: 36 research areas for attractive workplaces in future deep metal mining2014In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 5, no 4, p. 350-361Article in journal (Refereed)
    Abstract [en]

    Future efficient mining operations will be dependent upon a highlycompetent and well motivated work force, on all levels. The mining companieswill have to recruit their personnel from a limited group of talented individualswith high demands and expectations on future work. In order to be successfulwith this, the companies must offer attractive workplaces that are safe, sound,interesting and can offer challenging work tasks too. In this paper we discuss anumber of potential challenges for the future mining industry based on the factthat the majority of the mines are expected to be deeper and located in remoteareas. Our intention is to illustrate a possible way forward for the miningindustry. We start by describing a vision for such a safe and attractive mine.After that we present a comprehensive and possible research agenda necessaryfor creating the ‘New Attractive Mine’.

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  • 6. Johansson, Bo
    et al.
    Johansson, Jan
    Abrahamsson, Lena
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Attractive workplaces in the mine of the future: 26 statements2010In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 2, no 3, p. 239-252Article in journal (Refereed)
    Abstract [en]

    The mining industry needs to attract and recruit young talented people. An important task is therefore to create attractive mining workplaces that engages and motivates youngsters that today are not particularly interested to work within the industry. Our intention is to illustrate a possible way forward to form good, healthy and safe work places honouring key components such as knowledge, skill, cooperation, continuous development as well as acceptance of diversity. In the article we discuss different aspects of an attractive workplace and summarise our lessons learned in 26 statements dealing with safety, physical and psycho-social work environment and social responsibility.

  • 7.
    Johansson, Daniel
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Ouchterlony, Finn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering - Swedish Blasting Research Centre.
    Fragmentation in small-scale confined blasting2011In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 3, no 1, p. 72-94Article in journal (Refereed)
    Abstract [en]

    Design of sub-level blasting rounds and optimisation has become more important now when the sizes of the blasting rings get larger. Sufficient fragmentation is one of the key factors, and in confined blasting as in sub-level caving, this influences the mobilisation of the blasted ring. Model scale tests have been made to understand the mechanisms of rock breakage and therefore fragmentation under relatively confined conditions. By using the acoustic impedance between the blasted material and the confining debris, a relationship for fragmentation has been found depending on material, specific charge (powder factor) and physical properties of the debris. The results can be comparable with confined blasting in large scale.

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  • 8.
    Johansson, Daniel
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Villegas, Tomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Ouchterlony, Finn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering - Swedish Blasting Research Centre.
    Dynamic blast compaction of some granular materials: small-scale tests and numerical modelling of a mining-related problem2010In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 2, no 2, p. 79-100Article in journal (Refereed)
    Abstract [en]

    Sub-Level Caving (SLC) is an important mass mining method, involving blasting of ore against granular material in the form of caving debris. The debris compaction due to blasting influences the caving process. Blasting tests were made on cylinders of magnetic mortar placed inside plastic cylinders and confined by packed granular material. By introducing the acoustic impedance between the mortar and the confining granular material, the compaction is found to depend on material, specific charge and physical properties of the debris with statistical analysis. The tests have shown to be a good input for numerical modelling of blast compaction.

  • 9.
    Johansson, Jan
    et al.
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Johansson, Bo
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Lööw, Joel
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Nygren, Magnus
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Abrahamsson, Lena
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Attracting young people to the mining industry: six recommendations2018In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 9, no 2, p. 94-108Article in journal (Refereed)
    Abstract [en]

    The present workforce in the mining industry is ageing, and mining companies have difficulties recruiting young people who are not particularly interested in working in the industry. Simultaneously, mining companies tend to rely on contractors that offer volume flexibility and expertise, often in a combination that is economically appealing. This makes recruitment and development of the whole of the mining workforce complex. To recruit the right workforce, mining companies and their contractors need to cooperate and improve their knowledge about both attractive and repelling work features so that they can make wiser strategic decisions based on facts. On the basis of a Swedish context, we discuss different aspects of attractive workplaces and summarise our 'lessons learned' in six recommendations dealing with general health and safety issues, work organisation, competence development, gender equality, social responsibility and outsourcing.

  • 10.
    Khalokakaie, Reza
    et al.
    Shahrood University of Technology, Petroleum and Geophysics Department, Shahrood University of Technology, Faculty of Mining Engineering, Geophysics and Petroleum, Shahrood University of Technology.
    Ataei, Mohammad A.
    Shahrood University of Technology, Faculty of Mining, Petroleum & Geophysics, Shahrood University of Technology.
    Mikaiel, Reza
    Department of Mining and Metallurgy Engineering, Urmia University of Technology, Faculty of Mining Engineering, Geophysics and Petroleum, Shahrood University of Technology.
    Hoseinie, Hadi
    Faculty of Mining Engineering, Petroleum and Geophysics, Shahrood University of Technology.
    A fuzzy logic based classification for assessing of rock mass drillability2011In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 3, no 4, p. 278-289Article in journal (Refereed)
    Abstract [en]

    his paper describes a fuzzy classification system for evaluating of rock mass drillability. Six parameters; Uniaxial Compressive Strength (UCS), joints dipping, Mohs hardness, joints aperture, joints spacing and grain size have been used. In this fuzzy system, each rock mass is classified into five modes from very poor to excellent condition. As a case study, 15 rock masses in two mines in Iran have been studied and classified using fuzzy system and classic classification. The comparison of the results shows that the fuzzy classification produces clearer results than classic system especially in rock masses with boundary condition.

  • 11.
    Omidi, Omid
    et al.
    Faculty of Mining Engineering, Petroleum and Geophysics, Shahrood University of Technology.
    Torabi, Seyed Rahman
    Faculty of Mining, Petroleum & Geophysics, Shahrood University of Technology, Faculty of Mining Engineering, Petroleum and Geophysics, Shahrood University of Technology.
    Ataei, Mohammad A.
    Shahrood University of Technology, Faculty of Mining, Petroleum & Geophysics, Shahrood University of Technology, Faculty of Mining Engineering, Petroleum and Geophysics, Shahrood University of Technology.
    Hoseinie, Hadi
    Department of Mining Engineering, Hamedan University of Technology.
    Prediction of rock fracture toughness modes I and II utilising brittleness indexes2013In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 4, no 2, p. 163-173Article in journal (Refereed)
    Abstract [en]

    Fracture toughness and brittleness are of the most crucial rock features for underground excavation and drilling in rock mass. Developed standard tests to determine rock fracture toughness are very difficult as well as time consuming; furthermore, they require high-level accuracy during sample preparation and testing. An attempt has been made to propose simple relations to determine fracture toughness modes I and II based on brittleness indexes B 1, B2 and B3 in this paper. The data for regression were gathered from the literature, including modes I and II fracture toughness, uniaxial compressive strength and tensile strength. It was obtained that both fracture toughness modes I and II of different rock types give reasonable correlations with brittleness index B1. No correlation was observed between fracture toughness modes and other brittleness indexes

  • 12.
    Pérez Hidalgo, Kelvis
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nordlund, Erling
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Deformation analysis in connection with bending and shear failure of a monitored stope in the Kristineberg mine in Sweden2014In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 5, no 3, p. 181-201, article id 3Article in journal (Refereed)
    Abstract [en]

    This paper presents the evaluation and interpretation of monitored deformations and field observations of a 50-m long stope at the mining depth Z1200 in the Kristineberg mine. The monitoring was conducted by Boliden Mineral AB in 2010 as a part of a research project focused on the rock support-rock mass interaction. Borehole extensometers, total stations and tape extensometers were used to monitor the stope. The objective of the presented work was to assess the deformation modes of the stope, i.e., bending and shearing. The evaluation of the data showed that the field deformation data can be used to identify bending in the HW and shear failure in the FW of the stope. The paper also shows that the deformations in the roof of the stope are influenced by the bending and shear failure. Typical deformation values related to the bending and shear failure are also estimated.

  • 13.
    Salama, Abubakary
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Schunnesson, Håkan
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    The use of discrete event simulation for underground haulage mining equipment selection2014In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 5, no 3, p. 256-271Article in journal (Refereed)
    Abstract [en]

    The selection of equipment for haulage and transportation in underground mines is a challenge due to its impact on both production rates and costs. An under-dimensioned equipment fleet causes production losses, an over-dimensioned equipment fleet involves unnecessary additional capital costs as well as increased risk for traffic disturbances in the mine. Moreover, the combination of haulage and loading equipment needs to be optimized, the size of the different equipment types should create an optimal match for the complete system and also, the point in time when equipment is to be added or removed needs to be identified and well known before the change is made. Analytical methods are the traditional tools for equipment selection and these methods are still common, although the use of other tools such as discrete event simulation has been increasing during the last 10 years. In this paper, the use of discrete event simulation for equipment selection is discussed, and a case study where discrete event simulation was used to compare two different haulage units with the aim of improving production in an existing mine is presented. An overview of simulation of mining operations and an overview of analytical methods for equipment selection are also presented.

  • 14.
    Sereshki, Farhang
    et al.
    School of Mining, Petroleum and Geophysics, Shahrood University of Technology.
    Ataei, Mohammad A.
    Shahrood University of Technology, Faculty of Mining, Petroleum & Geophysics, Shahrood University of Technology, School of Mining, Petroleum and Geophysics, Shahrood University of Technology.
    Hoseinie, Hadi
    School of Mining, Petroleum and Geophysics, Shahrood University of Technology.
    Comparison and analysis of burden design methods in blasting: a case study on Sungun copper mine in Iran2010In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 2, no 2, p. 123-136Article in journal (Refereed)
    Abstract [en]

    In this study, 19 burden designing methods have been analysed for burden design in the Sungun Copper Mine in Iran. Also, economical Optimum Burdens (OBs) have been calculated using the results of actual blastings. The results of mentioned methods and optimum burden have been compared with each other. The comparison shows that the Anderson, Pears, Allsman, Langefors and Energy Transition (ET) methods have very close results to the OB. Also, the results of Fraenkel, Ash, Foldesi and Prillet methods are very different from the OB. Therefore, earlier methods could not be used in burden designing for open pit mines.

  • 15.
    Sundström, Erik
    et al.
    Luleå University of Technology, Department of Social Sciences, Technology and Arts, Humans and Technology.
    Nygren, Magnus
    Luleå University of Technology, Department of Social Sciences, Technology and Arts, Humans and Technology.
    Understanding the mining safety research field: exploring safety measures and programs in international research2023In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 14, no 3, p. 315-340Article in journal (Refereed)
    Abstract [en]

    Due to the risks inherent to mining workplaces, a variety of methods for improving safety have been explored in the mining industry research field. This article aims to provide an overview on the safety measures studied in this field to determine the subjects in focus and to identify potential gaps in the research field. 54 research articles focusing on safety measures in the international mining industry were reviewed through thematic analysis. Ten themes for safety measures were identified in the mining industry research field, with safety culture development and safe behaviours being the most common. With the scope of the research field and its gaps presented, the article discusses the implications of the rarity and commonness of certain themes and gives recommendations for future research. This includes recommending the exploration of different safety perspectives, socio-technical theory and neo-institutionalism.

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  • 16.
    Umar, Sraj Banda
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Edelbro, Catrin
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Influence of large-scale structures on the stability of the hangingwall in a caving mine: a modelling study2016In: International Journal of Mining and Mineral Engineering, ISSN 1754-890X, E-ISSN 1754-8918, Vol. 7, no 4, p. 294-312Article in journal (Refereed)
    Abstract [en]

    The Printzsköld orebody in the Malmberget mine of NorthernSweden is currently under production and is centrally located in the miningarea. The effects of the on-going sublevel cave-mining in this orebody arecurrently investigated with respect to cave development with an initialemphasis on the effects of stress redistribution and potential rock massyielding. In this study, three-dimensional discontinuum modelling of thePrintzsköld orebody is presented, in which the effect of three pre-existinglarge-scale geological structures have been studied. The results of the presentstudy showed low stress build-ups in the crown pillar and cave bottom, due toshear slip developing along the structures. The presence of large-scalestructures has no significant effects on the far-field stresses as shear slip alongthese structures is confined to cave boundaries. An analysis of the shearstrength of the structures showed larger effects of slip on reducing frictionangle than the reduction of cohesion.

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