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The exploitation of copper ore deposits in Polish underground mines is performed primarily by the use of blasting technology which seems to be relatively well suited to the hardness of the local rocks and to local mining and geological conditions. Blasting works are also recognized as an active method of seismic events prevention, conducted as group strain-release blasting within potentially instable main roof strata and in pillars. A notable number of recorded dynamic events can be clearly explained by the blasti...

According Act No. 157/2009 Coll., on mining waste management, the Czech Geological Survey carried out a project of the Operational Programme Environment in 2010пїЅ2012. The project was entitled пїЅInvestigation of closed and abandoned mining waste facilities posing a serious threat to the environment or human healthпїЅ. The aim was to create an inventory of hazardous mining waste facilities and to develop a methodology for their assessment. In the Czech Republic, 300 potentially hazardous mining waste sites were i...

A conveyor belt in regular operation is negatively influenced by a number of factors. This negative influence is the result of coming in direct contact with the transported material, which frequently causes serious damage and reduces belt lifetime. The scale and type of this damage depends on many factors, such as a beltпїЅs physical and mechanical properties and its design. The properties of the transported material and the design of the feed point are also of considerable importance [4]. When the damage is cause...

This paperwork is based on the data emerged from a conducted research related to a moisture influence on ignition sensitivity of air-methane gas mixture. For the purpose of this demarche it were used method of signal processing approach as it is data filtering and mathematical transform of the experimental data. In the first part of the paper, it was presented the spark test apparatus used for the experimentation and the results of the experimental data obtained during the tests with mixture air-methane and moistu...

The balancing devices in cable tension, DEC's, linking the extraction vessel (SKIP) and cables binding devices, DLCпїЅs, and are designed to equalize the tension in cables of extraction plant (multicable). The paper presents a new solution design of the screw-nut mechanism of initial tension cable for the uniformity tension and horizontal positioning of the rocking mechanism. The extraction vessels cables are attached to those by means of binding devices and equipment. Binding devices and equipment should be safe ...

In Polish underground copper ore mines belt conveyors are the most common transport facilities. In KGHM Polish Copper SA there are over 100 km of belt conveyors. To increase reliability of the transportation system there are built numerous ore bunkers ensuring continuity of the excavation during 5 working days of the week and on weekends, during which ore bunkers feed processing plants. In addition, some conveyors were built as reverse ones what in cases of emergency can provide alternative routes to supply ore to...

Ostrava city and Karvina city has a long history of mining. Over time in Ostrava there has been a decline in mining activity. But closed coal mine may be performed in the correct disposal of heavy burden on their surroundings. One of the biggest dangers are the outputs of mine gases. If gas leaks into a confined space, there is an accumulation of gas and may result in an explosion. The article presents two cases of methane explosions, which were noticed in the Ostrava-Karvina coalfield. Such an explosion had a dev...

The copper ore deposit in Poland is mined by three underground mines using mainly group blasting technology, which serves as the active rock-burst prevention, aiming at distressing rock mass by means of vibration provoked with blasting. The mines belong to KGHM Polish Copper Joint Stock Company (KGHM). The paper objective was to determine the influence of the length of after-group blasting waiting time on provoked seismic energy in one of the KGHMпїЅs copper ore mine. It was necessary to investigate, evaluate and ...

The management features of mining project life cycle are connected with unregulated periods of coordination, confirmation, certification, a time gap between development stage and project implementation, specific features of mineral deposit technological processes (overburden removal, mining, mineral processing). The Scheduling method does not take into consideration volatile deviations. Thus the management method of project life cycle is corrected by technicians of changes management. As a result it leads to signi...

The article deals with the examination of the state of the ball track at the heavy machine ZP6600/Z79. It gives results of material exams which were taken on given samples and it describes the progress and results of the numeric counting for the state of tenseness. The used method works with the ending parts at the bottom of part of the ball track when it touches the ball. The decision about the renovation of the track depended on the determination of the groove size degradation at the ball track. The material tes...

Development of energy, nuclear, engineering, petrochemical and chemical industry requires very massive and large workpieces. Requirements for machining workpieces of these department is the necessary adapt to the design and construction of machine tools. Analyses were conducted to carry out the overhaul and modernization for heavy cutting machine SKODA W 200 HC with digital subtraction, turntable S 100 C from 0 to 360пїЅ, while the carrying capacity of the turntable 100 t. The complexity of the repairs consisted o...

Currently, worldwide companies engaged in mineral processing are more and more interested in ecological transportation systems that do not effect and pollute the environment during their operation. One important element of such transportation systems is feeding station, which ensures the correct implementation of continuous transportation system. Proper functioning also increases the efficiency and reliability in transporting raw materials. The article deals with own 3D engineering design of the feeding and fillin...

The mining companies are often faced with the requirement for bulky material transfer which is possible to realize using overhead travelling cranes. An overhead travelling crane has rectangular work space, which is characteristic for this type of crane. A part of an overhead travelling crane is also a crane crab. Crane crab movement is carried out after the double-girder crane construction and loads are displacing along the whole length of the crane. The aim of this paper is a proposal of 3D geometric model of the...

The article deals with the design of new technology for the treatment of thin-walled house for carrier pipe conveyor drive roller. Production on conventional machine tool is unsatisfactory because of the failure of the machine tool and the actual production inaccuracies. Conventional machine tools are being replaced by numerically controlled machines CNC OS which allow reuse through production and higher labor productivity. They were designed and compared the new CNC axes of different structures, appropriate tools...

We considered the problem of training personnel of mining enterprises in effective application of personal protective equipment for respiratory organs - regenerative self-contained self-rescuers based on chemically bound oxygen. The engineering design task of constructing a reusable self-rescuer simulator with chemically bound oxygen supply in the absence of regenerative chemical agent was formulated. The paper describes a new design of a self-contained self-rescuer simulator, which is equipped with electric heate...

The problem of visualization of fires is relevant to the design of emergency situation simulators for industrial facilities involving a risk of fire or explosion. The effectiveness of a simulator depends on the accuracy of animation (visualization) used in this simulator. The present paper aims to build a mathematical model of fire spread at industrial facilities with regard to the associated processes of smoke generation, release of toxic combustion products and their influence on physical condition of an individ...

Safety of underground mining is significantly complicated if horizontal tectonic stresses hugely predominate over vertical ones and influence of tectonic disturbances, heterogeneities of physical-mechanical properties of rocks and mountainous relief is considerable. To the date multiply efficient tool methods have been developed aimed at estimation and forecast of rockburst hazardous events in the highly-stress rock mass. They allow studying the stress-strain state of the rock mass in the vicinity of underground m...

Research concerning magnetic diagnostics of the conveyor belt with steel cords was focused on its sections. In this paper authors are focusing on the extraction of the diagnostic parameters for the technical evaluation of the condition of the splice in belt conveyor. Data used for the analysis were acquired from the belt core testing using HRDS system. Parameters that are used in this paper take into account and can define its condition in the specific locations. Parameters were analysed and research shown influen...

Hydraulic fracturing is a widely used in the hydrocarbon production industry to stimulate oil and gas flow from traditional and shale formations. This technique is one of the essential elements of borehole mining technologies and is designed for controlled impact on the rock mass during the development of solid, liquid and gaseous mineral resources. The creation of a system of traversing cracks in the rock mass that are parallel to each other is of great practical interest for many geotechnical issues such as impr...

Drilling rigs are one of the most primary equipment of the underground mining industry. Thanks to their application, it was possible to multiply several times obtained metal ore output generated in underground mines. For last several years, the research related to the development of special rigs predisposed to mine narrow vein deposits are conducted. Dynamic testing of one of such structures are discussed in the paper. The dynamic tests of the rig have been carried out in two ways - either as a real construction s...

In Polish mines several belt replacement strategies are applied. They have been discussed in the context of strategies for machinery maintenance. The common practice is to base belt replacement on its condition established through visual inspections. Two main policies have been recognized: replacements in order to prevent costly downtimes of conveyor systems (in underground mines) and replacements in order to assure profitable refurbishment of worn out belts (in surface lignite mines). In order to choose the most ...

The process of Underground Coal Gasification involves risks of uncontrolled/unpredictable course of the gasification process. To minimize the risks of contaminants leaking outside the georeactor zone in the event of emergency is of a significant importance when aiming to maintain safe course of the process. The article presents methods and measures aimed at reducing the risk. These methods are based on reduction of the impact of released gaseous contaminants generated during the process. In order to achieve it, a ...

Dust is one of the major hazards that affect workers in the mining industry. Currently, there are many technologies that help reduce the dust load on the miners. But looking at the statistics of professional and profession-related diseases, it can be seen that the incidence of diseases caused by various industrial aerosols is not reduced. This indicates that the existing methods are not sufficiently effective. It is not excluded that the very method of estimating the dust load on workers is not correct and needs t...

One of the key parameters of the mine, which affects the choice of the scheme for stripping and transporting ore, is its annual productive capacity. At the same time, the analysis of the experience of domestic mining enterprises using the underground mining methods allows us to say that the traditional and most common transportation methods are skip hoisting and road transport using underground dump trucks [1]. Along with traditional ones, there are progressive energy-efficient and poorly-staffed types of transpor...

Among unique deposits of high-grade iron ores (HGIO) of the Kursk Magnetic Anomaly those that are referred to the Belgorod group are ranked as outstanding. One of them, located in the Central European part of Russia, is known as the YakovlevпїЅs underground mine. Its singularity is resulting from following circumstances: 1) high quality of ores, in which iron content exceeds 65%; 2) genesis of HGIO that are originating from ancient crust of jaspilites chemical weathering and appear to be an extremely fine-grained ...

The problem of stress state evaluation is really actual for the underground structures been exploited for a long time. Stress and deformation monitoring give opportunity for hazard prevention and planning operation mode of the underground facility. One of the most common methods of deformation control is convergence measurement, but transformation of measured data into stress state of underground structures is quite difficult. A technique for stress state evaluation of underground structures on the base of the ana...

Regarding the mining industry, the risk of an explosive atmosphere occurrence and the consequences differ from one mine to another, depending on the configuration of the mine and on the type of the coal extracted. Although preventive measures are taken, the potential risk of explosion cannot be excluded from firedamp mines, but only reduced as much as possible. Therefore, where the possibility of forming these explosive atmospheres exists, the explosion risk assessment is required by developing scenarios that cons...

Decades are mining raw materials from seabed deposits. We are talking about deposits which are on the interface of land and sea. These are placer deposits as heavy metals and gemstones, secondary deposits of limestone, phosphorus, salt and also beach deposits on the edge of the continents. In this article, the authors want to become familiar with both forecasting utilization of selected earth resources, but also want to point out new trends in obtaining them. In this article, we have a broad spectrum of earth reso...

Industrial ventilation is an extremely complex area and involving deep knowledge of fluid dynamics in the modern version (CFD), three-dimensional propagation of heat, complex flow of fluids, steady state in transient conditions, operating problems, contaminants inside the industrial objective, and outside respectively. Ventilation and air-conditioning installations in industrial conditions are designed to ensure the purity of the air and the corresponding inside environment for man's activity and the nature of the...

Increasing competition in the domestic and global markets causes companies to be more and more active in taking steps to obtain an advantage over competitors. The area, which is particularly important in building this advantage, is knowledge. Knowledge is the basic resource for every company, which if used properly, ensures development, growth and economic success. It very often happens that the companies are not fully aware of the knowledge potential they possess. Therefore, it is justified to take activities tha...

The article presents the research results on geomechanical processes related to the change in the stress-strain state in the rock mass during large-scale mining operations in highly stressed rock massifs. A geomechanical model has been created that allows considering the sequential development of a complex of adjacent deposits at the Khibiny rock massif. Based on the modeling results, the optimal order and direction of development of mining operations under rockburst hazardous conditions are determined. At that, t...

In this research the regularities of heavy oil conversion in supercritical water and the presence of finely dispersed caustobioliths and metal oxides were shown. The process of thermo-catalytic conversion was carried out in a closed reactor under temperature and pressure conditions, providing the transition of the aqueous phase in supercritical fluid. To investigate the selectivity of catalysts, different compositions of catalyst systems were prepared and studied for their effectiveness in the process of degradati...

The aim of this study is to contribute to the detection and identification of hydrothermal alteration zones in Variscan granites using magnetic susceptibility. The studied area is located in the North-western of Portugal and is characterised by the occurrence of Au mineralizations in quartz veins hosted in Variscan granites. Three different granite facies were studied, using two methodologies: (i) measurements, in situ, of magnetic susceptibility using a portable susceptibility meter (TerraPlus KT-10), allowing th...

The effectiveness of enrichment process of run-of-mine copper ore (at KGHMпїЅs ore enrichment plants) depends on the selection of appropriate working parameters of processing machines which are customized mainly to fit the fed rock type. Therefore, the knowledge of lithological composition of run-of-mine copper ore fed to the ore processing plant can significantly improve the effectiveness of the enrichment process. The issue of optimization of enrichment processes with the help of the use of in-situ sensor techno...

The threat of seismic activity is an inherent part of the operation in each of the three mines owned by KGHM Polish Copper JSC. It results from the high compressive strength of the rock, the high depth of retreat, and the significant tectonic of the deposit as well as human mining activity. There is no complete elimination of this threat, but adequate prevention is used to limit it. Impacts on this threat also include operational indicators such as advancement or progress and pace of mining work. The progress is d...

98% of total explosives used for civil uses are consumed by Polish mining plants, with 2.5 thousands of tonnes of explosives used in bituminous coal mines yearly. Bituminous mines are now facing the necessity of implementing a new project for preparing a system for recording the distribution of blasting materials. The execution of projects related to the implementation of new technologies at each organization, with Polish bituminous coal mines in particular, apart from problems related to legal, economical, techni...

In modern mining a tendency is observed to extend underground development of near open-pit reserves in thick ore deposits because of increase of open-pits ready to complete open mining operations or technical elimination. Researchers of Mining Institute KSC RAS have established that when developing the near open-pit reserves by mining systems of ore and country rock caving, the parameters of ore excavation and mining safety increase due to controlling ore drawing and constructing a thermal insulating layer. The ma...

Mining technical reclamation as the main technological process for the development of ore deposits with the open method, as well as the cost optimization of reclamation, taking into account possible technical solutions have been considered in the paper. The investigation proves that the time gap between the soil disturbance and reclamation should be minimal, that is, reclamation must be carried out not at the final stage of mining, but in the process of mineral mining. The reclamation time is directly related to t...

Despite of the significant reduction of the injuriesпїЅ number in recent years, Poland belongs to the countries with high rates of accidents at work. One of the leading industries in accidents at work is hard coal mining. The accidents occurring, their effects, and the poor condition of health of employees (due to working in adverse conditions of physical work environment) are the cause of significant financial loss of victims, their employers, and also the entire society. Therefore the question is: what action sh...

The quality of bucket wheel excavators (BWEs) operations is largely influenced by the physical-mechanical (structure, mineralogical composition, plasticity, anisotropy, degree of fracturing etc.) and technological properties (compressive strength, tensile strength, shear strength, compaction, consolidation, cutting resistance etc.) of the rocks. If the excavated materials are relatively homogenous, without intercalations with excessive cutting resistance, it is not difficult to conduct the technological process. I...

In accordance with the developed methodology for a comprehensive solution of issues of mineral deposits development in the Russian Arctic zone, a list of criteria has been established that allow evaluating the priority of nuclear power sources in solving problems of power supply to the Russian Arctic regions while developing the deposits and performing a ranking of the various reactor plants. The list is based on information technologies modeling objects, production and processing of raw material and geoecotechnol...

The authors have carried out uniaxial compression tests of 200 mm side cube specimens made of artificial layered geomaterial with the bedding angles of 0, 30, 45, 60 and 90 deg and with the different strength of the layers to study the process of deformation to failure using the multiparametric equipment designed for synchronous recording of physical fields of stresses, macrostrains, microseismic emission (MSE) and microstrains by speckle method. The integrated analyses of MSE signals, microstrains, stresses and s...

Schemes of mining and construction operations have been developed for inclined trenches on the open pit edge, where transport platforms and safety benches using the drilling and blasting method of rock mass preparation are located. The volume of mining operations is calculated taking into account the dislocation of a part of the open pit edge of the deep open pit mine for placement of loading points at the bottom of inclined workings. A new scheme of conducting mining operations implementing steeply inclined conve...

Conveyor belts operated on belt conveyors are subjected to a variety of loads that lead to damage. Belts undergo wear in a process that depends on the type of conveyor, its length, the material transported and the working site [2, 3, 5, 8]. Laboratory evaluation of a conveyor beltпїЅs lifetime requires determining a number of its properties, such as tensile strength, longitudinal and transverse elongation strength, delamination strength, shear strength, flammability, and resistance to low temperatures, as well as ...

Ensuring the stability of the sides and ledges of deep open-pit mines is one of the main conditions for the safety of mining operations. To detect various deformations in both the array of permafrost and on the surface of berms and bench slopes along the edges of the open-pit mine, a ground-based laser scanner was used to monitor the local section of the southeastern edge of the Nyurbinsky open-pit mine. There are three conditionally most active temperature periods, influencing on the geocryological state of perma...

The worldwide development of studies concerning volcanic-related deposits caused renewed interest in epithermal mineralizations in Sardinia and a prospecting program was developed in the eighties. A series of field surveys showed that hydrothermal alteration halos are widespread in the Tertiary volcanic terrains, and AuпїЅAg bearing mineralized outcrops were detected in a few localities. An exploration program was performed which reached the ore evaluation stage in two areas. The first economically viable gold dep...

A regulation of the mining operations mode during a new phase of open pit mining deep lying minerals through implementation of temporary non-operating open pit edges on many deep open pit mines made it difficult to extract minerals. Innovative technologies of working zones development along steep open pit edges have been tested at the pre-design stage with comparison of the obtained mining schedules with the design schedules based on the analysis of methods of controlling mining operations mode and their existing ...

The paper deals with the study of Powered roof support analysis, taking into account the interaction with surrounding rocks. In this respect, an analytical model of kinematics and load of the shield, a differential model of the shield-rock system equivalent stiffness and a Fuzzy logic based analysis of the parameters variation are presented. In the first two models, the classical approach of shield mechanics, the loading scheme was modified by taking into account the horizontal force acting between the roof and th...

The article aims at the presentation of results as well as the prognosis of deformations during mining works based on experimental measurements. For this study were explored the directional galleries from the layer nr.3 and transversal galleries from the mining basin in Valea Jiului. According to the depth of exploitation, the mining works are situated in rocks with variable resistance. In order to increase the reliability of mine works for the opening and afferent preparing of mining field from Valea Jiului, the ...

The authors propose a method for automated processing of seismic data obtained in high-stress rock masses structured as hierarchy of blocks with a view to detecting seismically active zones and seismic event clusters within a mine field. The processing algorithm is developed based on the statistical theory of classification and cluster analysis. Suitable for zoning of seismic data, FOREL family algorithms include algorithms based on the idea of incorporating objects in the zones of their highest concentration into...