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  • 1.
    Skawina, Bartlomiej
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Salama, Abubakary
    Department of Chemical and Mining Engineering, College of Engineering and Technology, University of Dar es Salaam, Dar es Salaam, Tanzania.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Simulating the effect of LHD operations on production rates and ventilation costs in a sublevel cave underground mine2019In: CIM Journal, ISSN 1923-6026, Vol. 10, no 3Article in journal (Refereed)
    Abstract [en]

    Load-haul-dump machines (LHDs) are typically used in underground metal mining opera-tions. Delays or inappropriate use of LHDs can result in production loss. Optimized LHD use is especially crucial in larger mines because longer travel distances increase heat, dust, and gas emissions, which in turn increase ventilation costs. This study, conducted at an existing Swedish sublevel cave underground mine, used discrete event simulation and the AutoMod™ DES tool to determine the ventilation costs related to using too many diesel LHDs in a production area with reduced ore pass availability. When fewer ore passes are available, ventilation costs related to operating LHDs in the production area were found to increase by as much as 200, 224, and 306% for one, three, and six LHDs in operation, respectively.  

  • 2.
    Yi, Changping
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering. Swedish Blasting Research Centre, Luleå University of Technology, Sweden.
    Johansson, Daniel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering. Swedish Blasting Research Centre, Luleå University of Technology, Sweden.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Effects of in-situ stresses on the fracturing of rock by blasting2018In: Computers and geotechnics, ISSN 0266-352X, E-ISSN 1873-7633, Vol. 104, p. 321-330Article in journal (Refereed)
    Abstract [en]

    Blasting is widely applied in deep rock excavation. The effect of in-situ stresses on the fracturing of rock due to blasting was investigated. A theoretical model was used to explain the effect mechanism of in-situ stresses on crack propagation due to blasting. Four cases with different in-situ stress conditions were numerically investigated. The numerical results indicate that the crack propagation is governed by the blast load in the vicinity of the blasthole while the high in-situ stresses can influence the crack propagation in the far-field. The crack propagation trends towards the direction in which the high initial pressure is applied.

  • 3.
    Skawina, Bartlomiej
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Salama, Abubakary
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Svanberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Gustafson, Anna
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    The effects of orepass loss on loading, hauling, and dumping operations and production rates in a sublevel caving mine2018In: The Southern African Journal of Mining and Metallurgy, ISSN 2225-6253, E-ISSN 1543-9518, Vol. 118, no 4, p. 409-418Article in journal (Refereed)
    Abstract [en]

    Orepass failure is a well-known problem in deep mines, and the risk of losing an orepass is associated with severe production disturbances. In the near future, one possible scenario in the Loussavaara Kiirunavaara Aktiebolag (LKAB) Malmberget mine is to concentrate the mining operation in fewer, but larger, production areas. In this paper we evaluate the effects of orepass loss on loading, hauling, and dumping operations and production rates using discrete event simulation, by simulating part of the Malmberget mine loading and hauling system under different environmental and operational constraints.

  • 4.
    Astrand, M.
    et al.
    ABB Corp Res, Control Optimizat & Analyt, Automat Solut, Västerås, KTH Royal Inst Technol.
    Johansson, M.
    KTH Royal Inst Technol.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Underground mine scheduling modelled as a flow shop: a review of relevant work and future challenges2018In: Journal of the southern African institute of mining and metallurgy, ISSN 2225-6253, Vol. 118, no 12, p. 1265-1276Article in journal (Refereed)
    Abstract [en]

    Advanced planning and automation are increasingly important in modern mines. Sophisticated methods for long-term mine planning are often used, and the advent of autonomous machines makes the actual operation more predictable. However, the interface between these two timescales, i.e. the scheduling of the mobile production fleet, often limits the ability to operate mines at maximum profitability. We show how scheduling the production fleet in an underground mine can be modelled as a flow shop. A flow shop is a general abstract process formulation that captures the key properties of a scheduling problem without going into specific details. Thus, the flow shop enables mine scheduling to reap the benefits of scheduling research from other industries. We review recent results from the mining community and the flow shop community, and introduce scheduling methods used in these two fields. This work aims at providing value to researchers from the mining community who want to leverage their skill set, as well as to theoretical researchers by presenting the mining process as a potential application area. Lastly, we discuss the results, and outline some future challenges and opportunities facing the industry.

  • 5.
    Salama, Abubakary
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nehring, Micah
    University of Queensland, School of Mechanics & Mineral Engnineering.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Financial analysis of the impact of increasing mining rate in underground mining, using simulation and mixed integer programming2017In: The Southern African Journal of Mining and Metallurgy, ISSN 2225-6253, E-ISSN 1543-9518, Vol. 117, no 4, p. 365-372Article in journal (Refereed)
    Abstract [en]

    This paper challenges the traditional notion that mine planners need to plan production so as to incur the lowest mining cost. For a given mine configuration, a mine that increases its mining rate will incur increased mining costs. In an environment in which operations are fixated on cost reduction, a proposal that increases costs will not be readily accepted. Such a proposal requires financial justification-the increase in costs might be recuperated by the additional production. This paper evaluates the net present value (NPV) across a range of copper prices for two underground orebodies located at different depths, using a production rate of 300 kt per quarter and a scenario that introduces additional equipment and costs for 450 kt per quarter. The evaluation was based on the changes of NPV for the orebody located at a shallow depth compared with the orebody at a greater depth. Discrete event simulation combined with mixed integer programming was used for analysis. Unlike traditional sensitivity analysis, this study re-optimizes the mine plan for each commodity price at each production rate. The results show that, for the low mining rate at the final copper price, an NPV of A$ 1530.64 million is achieved, whereas an NPV of A$ 1537.59 million is achieved at a higher mining rate. Even though pushing mining rates beyond traditional limits may increase mining costs, this option may be beneficial at certain commodity prices, particularly when prices are elevated.

  • 6.
    Greberg, Jenny
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Salama, Abubakary
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Gustafson, Anna
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Skawina, Bartlomiej
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Alternative Process Flow for Underground Mining Operations: Analysis of Conceptual Transport Methods Using Discrete Event Simulation2016In: Minerals, ISSN 2075-163X, E-ISSN 2075-163X, Vol. 6, no 3, article id 65Article in journal (Refereed)
    Abstract [en]

    As the near surface deposits are being mined out, underground mines will increasingly operate at greater depths. This will increase the challenges related to transporting materials from deeper levels to the surface. For many years, the ore and waste transportation from most deep underground mines has depended on some or all of the following: truck haulage, conveyor belts, shafts, rails, and ore pass systems. In sub-level caving, and where ore passes are used, trains operating on the main lower level transport the ore from ore passes to a crusher, for subsequent hoisting to the surface through the shaft system. In many mines, the use of the ore pass system has led to several problems related to the ore pass availability, causing production disturbances and incurred cost and time for ore pass rehabilitation. These production disturbances have an impact on the mining activities since they increase the operational costs, and lower the mine throughput. A continued dependency on rock mass transportation using ore passes will generate high capital costs for various supporting structures such as rail tracks, shaft extensions, and crushers for every new main level. This study was conducted at an existing underground mine and analyzed the transport of ore from loading areas at the lower levels up to the existing shaft points using trucks without employing ore passes. The results show that, when the costs of extending ore passes to lower levels become too great or ore passes cannot be used for production, haul trucks can be a feasible alternative method for transport of ore and waste up the ramp to the existing crusher located at the previous main level. The use of trucks will avoid installing infrastructure at the next main level and extending the ore passes to lower levels, hence reducing costs.

  • 7.
    Salama, Abubakary
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nehring, Micah
    School of Mechanical and Mining Engineering, The University of Queensland.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Analysis of the impact of increasing mining rate in underground mining using simulation and mixed integer programming2016In: International Journal of Mining Science and Technology, ISSN 2095-2686Article in journal (Refereed)
    Abstract [en]

    This paper challenges the traditional notion that mine planners need to plan production at mining rates that result in a low mining cost. For a given mine configuration, a mine that considers increases to its mining rate most often increases mining costs. In an environment in which operations are fixated on cost reduction, a proposal to increase costs may be very difficult to implement. Such a proposal may need to be justified financially because the increase in costs might not be recuperated by the extra production gained. This paper evaluates the net present value (NPV) of the selected range of copper prices for two underground orebodies located at different depths using a production rate of 300,000 tonnes and one that introduces additional costs at 450,000 tonnes per quarter. Discrete event simulation combined with mixed integer programming was used for the analysis. The results shows that, for the low mining rate at the final copper price, an NPV of $755.65M is achieved, whereas an NPV of $773.45M is achieved at a high mining rate. Therefore, even though pushing mining rates beyond traditional limits increases mining costs, pursuing this option at certain commodity prices may be beneficial, particularly when prices are elevated.

  • 8.
    Gustafson, Anna
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Sundqvist, Fredrik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Sjödin, Erik
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Conceptual models for mining at greater depths: Automated bolt rigs and scaling rigs2016Manuscript (preprint) (Other academic)
    Abstract [en]

    One of the challenges that underground mines face today is the deepening of the mines. This, together with lower grades of the deposits, makes the mines strive for higher productivity and lower costs. By introducing autonomous vehicles, the operators will be removed from the face, and thus safety for operators will be improved. Since autonomous vehicles are scheduled to operate during breaks, there is a potential for a productivity increase. The goal with this study was to determine if and to which degree autonomous bolt rigs and scaling rigs can improve the productivity in a deep underground mine.The research is based on data collected during 2013 from New Boliden AB’s Kristineberg mine in Sweden. A simulation tool, SimMine, was used for analyzing the effects of operational changes and for simulation of parameters that are difficult to estimate, such as traffic congestions. A number of scenarios were simulated and compared to the base case with focus on productivity.It can be concluded that the simulation scenarios using faster, manually operated vehicles shows a productivity increase, and that the automated vehicles further improved the productivity increase. The largest productivity increase comes however from faster vehicles, and not from the automation itself.

  • 9.
    Skawina, Bartlomiej
    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.
    Salama, Abubakary
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering. University of Dar Es Salaam, Department of Chemical and Mining Engineering.
    Novikov, Evgeny
    Boliden Mineral AB, Stockholm.
    Evaluation of near to face sorting plant in an underground mine: A case study from Kristineberg mine2016In: 2016 SME Annual Conference and Expo: The Future for Mining in a Data-Driven World, Phoenix, United States, 21 - 24 February 2016, New York: Society for Mining, Metalurgy and Exploration, 2016, p. 379-383Conference paper (Refereed)
    Abstract [en]

    Mining of ore bodies that are located at great depths enforces long distances to move the excavated rock masses to the surface. The excavated rock mass contains not only ore that can be economically extracted from the face but also waste, which is usually discarded several steps further downstream in the process. As a result large amount of rock masses are transported to the surface, influencing the costs at which the ore is produced. Reducing the amount of waste being transported to the surface by introducing near to face sorting plant would improve the in many cases strained transport system in the deep mine. In this study, one of Boliden’s cut and fill mines was analysed with respect to the challenges related to mass movement and increasing mining depth. The study aims to evaluate the use of the new near to face sorting system in the operating underground mine. Discrete event simulation was used to study and analyse the mass movement with and without the near to face sorting plant. The paper shows how the underground mass movement system and the production were influenced when a near to face sorting equipment was added into the current system.

  • 10.
    Skawina, Bartlomiej
    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.
    Jonsson, Kristina
    LKAB, Research & Development, 983 81 Malmberget.
    Salama, Abubakary
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Ore pass loss mitigation approach in Malmberget mine2016In: Seventh International Conference & Exhibition on Mass Mining: (MassMin 2016), Sydney: The Australian Institute of Mining and Metallurgy , 2016, p. 617-622Conference paper (Refereed)
    Abstract [en]

    In today’s underground mass mining the ore pass is an important part of the infrastructure, since it connects two or more of the mine levels and used for conveying or storing large amounts of material. One of the main risks related to an ore pass is when operational or structural failure occurs thus leading to long-term loss of functionality. Developing or rehabilitating an ore pass when major failure has occurred is a time-consuming and expensive operation, and the risk of a long-term ore pass loss motivates the development of alternative transportation strategies in order to ensure the continuation of smooth operations in large underground systems. The study presented in this paper has been done at the Loussavaara Kiirunavaara AB (LKAB) Malmberget mine in Sweden, where the iron ore deposits are being extracted using sublevel caving. The study analyses the transportation system in one of the mine’s ore bodies using discrete event simulation (DES) with a focus on maintaining ore transportation in the event of the loss of an ore pass.

  • 11.
    Greberg, Jenny
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Sundqvist, Fredrik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Project: Optimized Medium Range Mine Operation Scheduling2016Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Scheduling of mine operations is complicated by the large variations of input parameters, which in,addition is constantly changing, leading to a tedious task which demands managing of severalhundred of activities per week. Scheduling and planning tools exist for single processes alone, but notool has been constructed to coordinate all processes and including real-time information. Such asolution would have a large implication for in-mine resource and production optimization throughtimely management of real-time delays mitigating the risk of unplanned stops in production throughearly rescheduling, yielding lower operation costs due to better utilisation of resources.The need for a more flexible solution for medium range scheduling has been sought after from themining industry for long, although the technology for receiving real-time information and handlingthereof has not previously existed. However, today, many mines have installed mine-wide Wi-Finetworks, for the first time enabling real-time 3D visualisation and communication with all in-mineprocesses and personnel. This project aims to build and demonstrate a working prototype of a tool,designed to coordinate real-time information and actions of mining processes, to optimize thescheduling of resources used in mining.It is estimated that optimized scheduling would increase safety for humans involved in theoperations through decreased traffic in heavily used areas. Also, it would decrease energyconsumption (for e.g. trucks and ventilation) and related emissions per produced ton, as well asdecrease the man-hours per ton through optimal use of resources.

  • 12.
    Pirard, Eric
    et al.
    University of Liège.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    The Material Life Cycle: A Steering Wheel for Europe's Raw Materials Academy2016In: Rewas 2016: Towards Materials Resource Sustainability : proceedings of a symposium sponsored by the Recycling and Environmental Technologies Committee, the Materials and Society Committee, the Extraction & Processing Division, and the Light Metals Division of the Minerals, Metals & Materials Society (TMS) held during TMS 2016, 145th Annual Meeting & Exhibition, February 14-18, Downtown Nashville, Tennessee, Music City Center / [ed] Randolph Kirchain..., Springer International Publishing , 2016, p. 263-268Conference paper (Refereed)
    Abstract [en]

    EIT Raw Materials is a major European initiative supported by more than 120 core and associatepartners from industry, research and academia. Among the core missions of this network is theestablishment of a Raw Materials RM Academy to educate T-shaped professionals that willcontribute to the development of a sustainable and resource efficient Europe.Every T-shaped professional should combine an in depth knowledge of his own discipline with asound understanding of the challenges of the full raw materials value chain and with a mindsetfor innovation and entrepreneurship. The main objective of the RM Academy is to connect all Tshapedprofessionals to help create the circular economy steering wheel. Therefore, the RMAcademy has the following missions:- Label and support educational programs.- Promote a permanent offer of cross-disciplinary programmes, workshops and courses.- Train T-shaped professionals into T-shaped entrepreneurs.- Promote lifelong learning initiatives.- Stimulate wider society learning initiatives aiming at raising social and politicalawareness.- Closely collaborate with industry- Enable a high degree of mobility of students and professionals

  • 13.
    Skawina, Bartlomiej
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Salama, Abubakary
    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.
    Sundqvist, Fredrik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Alternative fleet configuration for Malmberget mine2015Report (Other academic)
    Abstract [en]

    This report is part of the work done by Luleå University of Technology within the EU 7th framework project I2Mine, Innovative Technologies and Concepts for the Sustainable and Intelligent Deep Mine of the Future. The work is performed within work package 2 Novel mining and underground processing methods, subtask 2.1.1 Novel mining methods and processes for deep, steeply dipping orebodies.

  • 14.
    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.
    Skawina, Bartlomiej
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Gustafson, Anna
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Analyzing energy consumption and gas emissions of loading equipment in underground mining2015In: CIM Journal, ISSN 1923-6026, Vol. 6, no 4, p. 179-188Article in journal (Refereed)
    Abstract [en]

    In an environment of rising energy prices and mining at greater depths, cost-efficient loading and hauling equipment is essential. Conducted at an underground mining operation, this study analyzes the energy consumption and gas emissions of diesel and electric load-haul-dump machines (LHDs) with similar bucket capacities. Based on energy prices from the first quarter of 2014, results of discrete event simulation show that energy costs for diesel and electric LHDs are US$0.24/t and US$0.07/t, respectively. Also, diesel LHDs emit 2.68 kg CO2 per litre of diesel fuel, whereas using electric machines reduces the need for ventilation to mitigate engine heat and emissions and reduces energy costs.

  • 15.
    Salama, Abubakary
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nehring, Micah
    School of Mechanical and Mining Engineering, The University of Queensland.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Evaluation of the impact of commodity price change on the mine plan of deep underground mining2015In: International Journal of Mining Science and Technology, ISSN 2095-2686, Vol. 25, no 3, p. 375-382Article in journal (Refereed)
    Abstract [en]

    The fluctuations in commodity prices influences mining operations to continually update and adjust their mine plans in order to capture additional value under the new market condition. Some of the adjustments could include changes to the production sequencing, changes to the point at which the open pit transitions to the underground, and the time for changing or modifying the existing ore handling systems as a result of an increase in mine depth. This paper seeks to present a method for quantifying the net present value component of optimal mine plans that may be directly attributed to the change in commodity prices, and more importantly the changes in the mine plan itself. The evaluation is conducted on a deep underground copper deposit amenable to sublevel stoping whereby optimal mine plans were generated across a total of ten copper price scenarios ranging between $5250/t Cu and $9750/t Cu. Discrete event simulation in conjunction with mixed integer programming was used to attain a viable production strategy and then to generate optimal mine plans. The analysis indicates that the increase in prices results in an increase in net present value from $96.57M to ultimately reach $755.65M. In an environment where mining operations must be looking to gain as much value as possible from the rights to exploiting a finite resource, it is simply not appropriate to keep operating under the same mine plan if commodity prices have altered during the course of operation.

  • 16.
    Salama, Abubakary
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Skawina, Bartlomiej
    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.
    Sundqvist, Fredrik
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Future loading system at Kiirunavaara underground mine2015Report (Other academic)
    Abstract [en]

    This report is part of the work done by Luleå University of Technology within the EU 7th framework project I2Mine, Innovative Technologies and Concepts for the Sustainable and Intelligent Deep Mine of the Future. The work is performed within work package 2 Novel mining and underground processing methods, subtask 2.1.1 Novel mining methods and processes for deep, steeply dipping orebodies.

  • 17.
    Greberg, Jenny
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Salama, Abubakary
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Innovative mining methods and processes for deep steeply dipping deposits: -I2Mine Subtask 2.1.12015Report (Other academic)
    Abstract [en]

    This report presents a summary of the work done by LTU in the 7:th frame work project I2mine, subtask 2.1.1 (Innovative Technologies and Concepts for the Intelligent Deep Mine of the Future, subtask 2.1.1 Development of innovative mining methods and processes for deep steeply dipping deposits).The main objective of the research presented in this report is to develop potential new mining methods or alter/modify already existing mining methods for mining of deep steeply dipping large hard rock ore bodies, and to develop mining methods which are safe, rational, and with a minimum of operational losses. Focus is on large scale underground hard rock mining methods and cut and fill and stoping methods.The processes are developed with focus on three issues: Safe mining, Green Mining and high productivity.

  • 18.
    Skawina, Bartlomiej
    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.
    Salama, Abubakary
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Novikov, Evgeny
    Introducing a sorting plant in the Kristineberg mine: an analysis of the effects on production2015Report (Other academic)
    Abstract [en]

    This report is part of the work done by Luleå University of Technology within the EU 7th framework project I2Mine, Innovative Technologies and Concepts for the Sustainable and Intelligent Deep Mine of the Future. The work is performed within work package 2 Novel mining and underground processing methods, subtask 2.1.1 Novel mining methods and processes for deep, steeply dipping orebodies. Reaching the ore bodies that are located at greater depths require extensive transportation systems. The transported ore before being refined contains not only minerals that can be economically extracted from the production face but also waste. To reduce the amount of transporting unnecessary material up to the surface near to face sorting plant has been introduced. In this study near to face sorting plant was integrated in the simulation model that was based on one of the Boliden’s cut and fill mines for possible enhancement of the currentand future transportation systems to reduce the unnecessary amount of mass movement upstream. In this study discrete event simulation was used to study and analyse the mass movement before and after near to face sorter implementation. The paper shows the effects on the production rate and distribution of rock mass in the underground mine. When miningoperations will continue to reach greater depths, utilizing sorting technique would be advantageous, as it enables to leave the waste behind, hence reduces the costs necessary for transporting and processing unnecessary material further upstream. Taking into consideration the sorting plant speeds equal to or higher than 70 tph, the sorting plant was able to maintain the speed of the simulated production. If the sorting plant will maintain the speed at 30 tph during the simulation it was not possible to fulfil the yearly production blasting plan. In cases of necessary stockpiling of the material in front of the sorting plant, some of the material would have to bypass the sorting plant and be transported up via hoisting system with the rest of the ore. However, further studies with regards to the feasibility of the pre-concentration and integration issues should be addressed.

  • 19.
    Skawina, Bartlomiej
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Salama, Abubakary
    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.
    Production rate comparison using different Load-Haul-Dump fleet configurations: Case study from Kiirunavaara Mine2015Conference paper (Refereed)
  • 20.
    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.
    Gustafson, Anna
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Conceptual models regarding mine layout/infrastructure and process flow at greater depths: A literature review on haulage systems2014Report (Other academic)
    Abstract [en]

    This report is part of the work done by Luleå University of Technology within the EU 7th framework project I2Mine, Innovative Technologies and Concepts for the Sustainable and Intelligent Deep Mine of the Future. The work is performed within work package 2 Novel mining and underground processing methods, subtask 2.1.1 Novel mining methods and processes for deep, steeply dipping orebodies. This subtask aims at identifying new conceptual methods and processes for mining of deep, steeply dipping orebodies. The literature review presented in this report is aiming at identifying haulage systems that might be applicable for the given conditions, and serves as input for the future work within subtask 2.1.1 which is carried out by the research subject Mining and Rock Engineering at LTU together with LKAB and Boliden from November 2011 to November 2015.

  • 21.
    Skawina, Bartlomiej
    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.
    Salama, Abubakary
    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.
    Mechanical excavation and drilling and blasting: a comparison using discrete event simulation2014In: Mine Planning and Equipment Selection: Proceedings of the 22nd MPES Conference, Dresden, Germany, 14th – 19th October 2013 / [ed] Carsten Drebenstedt; Raj Singhal, Springer-Verlag GmbH , 2014, Vol. 1, p. 367-378Conference paper (Refereed)
    Abstract [en]

    Mine development is often a bottleneck in mining operations and is strongly influenced by the choice of excavation method. In this paper, the two well-recognized methods, conventional drill and blast and mechanical excavation, are compared and discussed. The former method is the continuation of a long tradition in mining, while the latter method started to be used in 1960s, when mechanical excavators such as roadheaders, continuous miners or tunnel boring machines were developed. The rate at which the tunnel advances is one of the most important factors for mine development. By evaluating and selecting the right technique, the speed and effectiveness of the development could be improved. This paper aims to estimate and compare the advancement rate between the mechanical excavator and drill and blast method using simulation with AutoMod. This study has been done for one of Boliden Mineral AB’s mines in Sweden. For the drill and blast method, the study shows increased performance for two simultaneously drilled tunnels when compared with a single one. Furthermore, the simulation runs have estimated the total tunnel development times for the specified development lengths. The study is concluded by sketching an interesting picture of mine development using the mechanical excavator.

  • 22.
    Salama, Abubakary
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nehring, Micah
    School of Mechanical and Mining Engineering, The University of Queensland.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Operating value optimization using simulation and mixed integer programming2014In: International Journal of Mining, Reclamation and Environment, ISSN 1748-0930, E-ISSN 1748-0949, Vol. 28, no 1, p. 25-46Article in journal (Refereed)
    Abstract [en]

    Mining operations around the world will increasingly need to operate at greater depths. This significantly influences the complexity of ore extraction and ore transportation to the surface. The increase in mine depth leads to increases in haulage distance from mine areas to the mine surface. This results in an increase in energy costs to haul material further. Due to the increasing cost of future operations, the choice of the haulage method becomes an important factor in the optimization of the mine plan. The haulage process is one of the most energy intensive activities in a mining operation, and thus, one of the main contributors to energy cost. This paper presents the comparison of the operating values of the mine plans at depth levels of 1,000, 2,000, and 3,000 meters for diesel and electric trucks, shaft and belt conveyor haulage systems for the current and a predicted future energy price scenario. The aim is to analyze the impact of energy requirements associated with each haulage method, as well as the use of alternative sequencing techniques as mine depth increases. This study is carried out using a combination of discrete event simulation and mixed integer programming as a tool to improve decision making in the process of generating and optimizing the mine plans. Results show that energy cost increases across each haulage method at both current and future energy prices, with increasing depth. This study thus provides a broad and up to date analysis of the impact on operating values that may be experienced with the use of the main haulage systems available at present. Also, the study shows how the combination of discrete event simulation and mixed integer programming generates a good tool for decision support.

  • 23.
    Greberg, Jenny
    et al.
    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.
    Johansson, Daniel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Project: Face to Surface2014Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    Projekt inom ramen för SIO STRIM

  • 24.
    Greberg, Jenny
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nordqvist, Anders
    LKAB, Sverige.
    Project: I2Mine2014Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Novel mining methods and processes for deep, steeply dipping orebodies

  • 25.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Project: KIC RawMaterials WG Primary resources2014Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Working group Primary Resources in the KIC RawMatTERS-consortium consisting of 70 partners from 11 countries.

  • 26.
    Weihed, Pär
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Björkman, Bo
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
    Abrahamsson, Lena
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Andersson, Eira
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Fältholm, Ylva
    Luleå University of Technology, Department of Business Administration, Technology and Social Sciences, Human Work Science.
    Bäckblom, Göran
    LKAB, Sverige.
    Project: Strategic Research and Innovation Agenda for the Swedish Mining and Metal Producing Industry2014Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Developing the Strategic Research and Innovation Agenda for the Swedish Mining and Metal Producing Industry, for the years 2013-2030.

  • 27.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Project: Sustainable Mining of the Future WP 9 Process and Equipment Reliability2014Other (Other (popular science, discussion, etc.))
  • 28.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Project: Sustainable Mining of the Future WP1 Zero entry in to the production area2014Other (Other (popular science, discussion, etc.))
  • 29.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Project: Sustainable Mining of the Future WP10 Continous Mechanical Excavation2014Other (Other (popular science, discussion, etc.))
  • 30.
    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.

  • 31.
    Hassan, Syed Alley
    et al.
    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.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Gustafson, Anna
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Transition from surface to underground mining in the Arctic region: A case study from Svartliden Gold Mine, Sweden.2014In: Mine Planning and Equipment Selection: Proceedings of the 22nd MPES Conference, Dresden, Germany, 14th – 19th October 2013 / [ed] Carsten Drebenstedt; Raj Singhal, Germany: Encyclopedia of Global Archaeology/Springer Verlag, 2014, Vol. X, p. 1397-1408Conference paper (Refereed)
    Abstract [en]

    Gold ores often consist of nuggets associated with quartz veins. In other ore types gold can be found as a by-product to pyrite. For both types, mine planning of scattered veins type deposits is often complicated regarding both mine design and production scheduling. Despite the cold climate in the Arctic region, near surface deposits are initially mined with open pit mining. As the mine goes deeper, the stripping ratio and the transportation cost increases which economically limit the possibility to continue the project with open pit mining. The transition to underground mining, with gradually decreasing production from an open pit, near its final depth, and with gradually increasing production from newly developed underground production areas, require detailed planning and production scheduling to avoid production delays and maintaining a high cash flow. This paper high-lights the main operational aspects of the Svartliden gold mine in Sweden and in particular how a scattered gold deposit during harsh cold weather conditions was dealt with. The on-going transition from surface to underground mining and the applied concept of minimizing own personnel in favour of national and local contractors for production purposes are also discussed.

  • 32.
    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.
    Optimization of Truck-Loader haulage system in an underground mine: A simulation approach using SimMine2012In: MassMin 2012: 6th International Conference & Exhibition on Mass Mining, Sudbury, In. Canada, June 10-14 2012, Sudbury, Canada, 2012Conference paper (Refereed)
    Abstract [en]

    working face and transporting it to the dumping point where it is reloaded into trucks for further transportation. In some cases, trucks can be loaded directly at the working face or at a dumping point. Due to a limited size of the drifts and the ramps used in transporting material, the size of the haulage equipment is an important factor to consider when seeking to optimize the haulage system. This paper studies the haulage system of a mine which operates a fleet of three Load-Haul-Dump (LHD) machines and three dump trucks, using SimMine simulation software. Its aim is to evaluate the effect of increasing the number of trucks on the overall mine throughput. The results indicated that the capacity of the existing loading equipment does not match the number of trucks; this affects the haulage system and the mine production. The study resulted in the recommendation to increase the fleet of dump trucks.

  • 33.
    Hassan, Syed Alley
    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.
    Transitional phase for small steeply dipping ore bodies from open pit to underground mining: a case study from Scandinavian mining industry2012In: Proceedings of MPES 2012, 2012, p. 291-299Conference paper (Refereed)
    Abstract [en]

    The transition from open pit to underground mining involves drastically changes in the production system. The equipment for underground mining will change as well as the logistics and the transportation system. Demands of rock stability and control will also change in nature and in equipment needed. At the same time the large investments in underground infrastructure and equipment require short lead times to maintain a high cash flow for the companies. Without proper planning many problems can arise influencing the production flow. Therefore it is essential to have detailed planning and modeling before reaching the transitional depth of the mine. Computer software like Surpac can be a suitable tool for simultaneously planning of both the open pit and the underground mining operation.This paper presents some experiences from Björkdal Gold mine, one of the earliest and largest Gold mines in Scandinavia. The paper presents the mine and how the transition from surface to underground mining has been handled and optimized.

  • 34.
    Greberg, Jenny
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Sundqvist, Fredrik
    SimMine.
    Simulation as a tool for mine planning2011Conference paper (Refereed)
    Abstract [en]

    This paper discusses the use of simulation in the mine planning process. A case study on the Newcrest Cadia East project is presented, and the challenges and possibilities for using simulation as a tool for mine planning and scheduling is discussed.The simulation study presented in this paper was performed during the project´s pre-feasibility stage, and focused on the planning and scheduling of the development of panels in the future mine. The Cadia East project will be the largest underground operation in Australia and the first using panel caving. Simulation was used in order to optimize the development of panels; it was mainly used in order to verify the plans for the development process and allocate resources in an optimal way. The work was performed as an iterative process and adjustments to the plans were made according to simulation results. Bottlenecks were identified and different scenarios were tested. The results from the simulation study shows how different operational constraints affect the planned development process and how changes in priorities can be necessary in order to maintain a high development speed. Furthermore the study shows how changes in planned mine layout requires changed strategies, and how this was solved using the simulation tool. In this paper the authors critically discusses the use of simulation in mining operations: what are the limitations and challenges of using simulation as a tool for mine planning and scheduling, what are the benefits, and what do we aim for in the future?

  • 35.
    Greberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Project: Risk- and sensitivity analysis of increased production in Aitik2010Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Aitik is one of Europes largest open-pit mines, and the copper production 2006 is approximately 18 Mton. Aitik is facing an extensive increase in production capacity; initially from 18 Mton to 28 Mton, and further on with possibilities for an increase to 33 Mton. An increase in production brings on risks and uncertainties that are important to consider. This project aims to map and identify these risks and uncertainties, to quantify them and to analyse their impact on cost and production in a 10-15 year perspective.

  • 36. Svanberg, Jenny
    A constructive approach to the interaction between risk and logistics: a study of total offers in the aerospace industry2004Doctoral thesis, comprehensive summary (Other academic)
  • 37. Greberg, Jenny
    et al.
    Almgren, Torgny
    Volvo Aero.
    Riskanalys ur ett logistiskt perspektiv: en fallstudie2004In: Proceedings from PLAN 2004, Lund, Sverige, 2004Conference paper (Refereed)
  • 38.
    Greberg, Jenny
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Almgren, Torgny
    Volvo Aero.
    Ringsberg, Kaj
    HTU.
    Integrated product and service offerings creates logistical challenges: the problem and the choice of research design2002In: Proceedings from Fourth International Meeting for Research in Logistics IMRL: Lisbon, Portugal, October 13-15 2002, 2002Conference paper (Refereed)
  • 39. Greberg, Jenny
    Risk parameters in integrated product and service offerings: a Swedish aerospace industry example2002Conference paper (Other academic)
    Abstract [en]

    The development towards total offers; integrated product and service offers, is a trend in industry, particularly in business to business relations. This strive towards more extended offers can be noticed in a wide range of companies from different branches, and it has important implications on management. Today there is no established method available to handle the extended risks associated with this type of business. This study constitutes a part of an ongoing research project and will be part of the basis for a model to evaluate the outcome of total offers regarding maintenance in the aircraft industry. The paper presents a case study performed at Volvo Aero Corporation, a Swedish aerospace company. The case study explores the importance of logistics and pinpoints the sources of risk in total offers regarding aircraft engine maintenance. Focus is on the sources of risk associated with logistics. The study is a multiple-case case study, and it is performed using multiple sources of evidence, such as is interviews, archival studies and observations, in order to be supported by triangulation for verification. The result from the case study gives an increased knowledge regarding the parameters affecting the risk, and facilitates the creation of win-win relationships within this industry.

  • 40.
    Greberg, Jenny
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Almgren, Torgny
    Volvo Aero.
    Ringsberg, Kaj
    HTU.
    Focus on logistic parameters to control business risk in functions marketing2001In: Proceedings from NOFOMA 2001, Reykjavik, Iceland, 2001Conference paper (Refereed)
  • 41.
    Greberg, Jenny
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Almgren, Torgny
    Volvo Aero.
    Ringsberg, Kaj
    HTU.
    Functions marketing: Take control of logistics to control business risk2001In: Proceedings from International Conference on Industrial Logistics ICIL 2001, Okinawa, Japan, July 9-12, 2001, 2001Conference paper (Other academic)
    Abstract [en]

    This paper introduces the possibility of increasing the efficiency and minimizing the risk in functions marketing in the aircraft industry by focusing on better control of the logistic parameters. Functions marketing can be described as the marketing of a function rather than a product. The emphasis in this paper will be on the maintenance, i.e. repair and overhaul, of aircraft engines. Functions marketing rather than maintenance, is a clear trend in the industry today. It is often economic and financially attractive for the customer to buy a function rather than a product. Buying functions also support many companies’ strategies to focus on their core business.The primary economic advantages for the customer of aircraft engine maintenance, lies in the reduction of business risk, and the possibility to estimate the cost per engine flight hour. As a large part of the risk is transferred from the buyer of maintenance to the seller through the contract regulating the marketing of a function, it is crucial for the seller to have the knowledge and capacity to calculate and control the business risks involved. The maintenance cost consists primarily of the costs for repair and exchange of engine components. The capital costs and obsolete costs for these components are very large. The scope of maintenance works is, to a large extent, controlled by the conditions stipulated in contracts. A number of contracts indicate that the business risk, for the seller, depends on how the contractual agreement and the logistic parameters interact. In order to control the business risk, emphasis must be put on the ability to quantify and control the logistic parameters in question.This paper concludes with a structured discussion about modeling of contractual agreements when logistic parameters are included, and the risks that are associated with this interplay.

  • 42.
    Svanberg, Jenny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Raise boring optimization: analysis of reliability and drilling performance on raise boring in the Kiirunavaara Mine2001Licentiate thesis, monograph (Other academic)
    Abstract [en]

    For the new main level in the Kiirunavaara mine, new ventilation shafts and ore passes had to be made. The method chosen for the excavation was raise boring. This thesis describes an analysis of the raise boring performed, and gives suggestions on how to optimize the raise boring. The analysis is made in two parts, a reliability analysis and an analysis of the drilling. The reliability analysis investigates the reliability measures, such as availability, degree of usage and mean time between failures. The analysis of drilling mainly concerns the achieved penetration rates, and the factors influencing the penetration rates. Some statistical analyses are also made on the penetration rates. Based on the analyses, suggestions for improvements in order to optimize the raise boring, and the use of the raise boring machines are given.

  • 43.
    Greberg, Jenny
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Kumar, Uday
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
    Selection of maintenance strategy for mechanized and automated systems using risk analysis1999In: Proceedings from 5th International Symposium on Mine Mechanization and Automation, Laurentian Univ. Sudbury, CANADA, JUNE 99, 1999Conference paper (Refereed)
    Abstract [en]

    Taking decision concerning selection of maintenance strategy using risk based criteria is essential to develop cost effective maintenance policies for mechanized and automated systems because in this approach technical features (such as reliability & maintainability characteristics) are analyzed considering economic and safety consequences of each alternative at hand. This approach also provides a holistic view of the various decision scenario concerning maintenance strategy where cost consequences of every possible solution can be assessed quantitatively. It is very important that formal reliability and risk assessment form an integral part of the maintenance planning and control process.This paper emphasizes the need of integration of risk analysis methods in all phases of conception, design manufacturing and operation to arrive at the most optimal maintenance policies/strategies for the system under consideration. The paper also discusses various steps involved in risk analysis and concludes that the risk assessment can be used in many activities related to maintenance for arriving at the best decision among the several alternatives available at hand.

1 - 43 of 43
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