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The copper ore deposit in Poland is extracted by three underground mines which belong to KGHM Polish Copper JSC. Since the very beginning, copper ore mining has been accompanied by seismic activity and rock-burst hazard controlled by means of several prevention activities aiming at assessing and combating the danger. Seismology is the prime method to measure seismic activity i.e. the number and energy of rock mass shocks. The hazard monitoring also encompasses measurements of the convergence of mine workings, i.e....

Extraction of the copper ore deposit in the Legnica-G?ogow Copper Basin in Poland is usually associated with high seismic activity. In order to face this threats, a number of organizational and technical prevention methods are utilized, from which blasting works seem to be the most effective. A significant number of recorded dynamic events may be clearly and directly explained by the effects of this approach. It is also expected, that the simultaneous firing of a number of mining faces may provide the amplificatio...

For underground extraction of coal are running a complex network mining vertical, horizontal and inclined role extraction, transportation and evacuation on the surface. Associated system of mining works has the ventilation network to ensure the oxygen necessary for workers, diluting explosive gases and toxic substances and evacuated heat and humidity from the underground. For air evacuation from the underground workings, from the point of entry of fresh air to the polluted air exit point, is used powerful fans loc...

This article presents the analysis of the existing schemes of mining, logistics and consumption of fuel in North Yakutia which ones are form technological chains unique in complexity of management. This is due to negative impact of a large number of analyzed factors. The general trend is towards to reduction of coal consumption in hard-to-reach regions. Therefore, local coal deposits near the key points of consumption are not developed. Geotechnical and economic indicators of small-scale coal mines are generally l...

This paper refers on the result of an experimental work developed in a quarrying site aimed to test the reliability of geostatistical approach as an alternative tool in the assessment of spatial variability of professional hazards. The case study is referred to the exposure of workers to airborne dust generated from typical quarrying activities. In such a risk assessment procedure in fact, the most useful alternative method to personal sampling is represented by defining the space-time variability of the physical ...

The strategic management of the mining companies involved in the extraction and processing of energy raw materials still lacked a strategic tool to help determine the patterns of extraction of energy resources in the development of the external environment or external conditions. In this article, the authors sought to find a possible econometric model of black coal. Research is based on data available from the macroeconomics and mining of the selected mineral, which are analyzed using the multidimensional regressi...

The paper presents results of experimental study of microstructural changes in rock specimens under the effect of high pulse pressure due to shock waves. Specimens of strong rock and coal were placed into special steel preservation ampoules. Shock waves were generated by explosion of trotyl blocks. The study involved electron microscopy, micro- and nanoindentation and laser spectroscopy of particle size. Images of specimen surface fragments were obtained by electron microscopy at various scale levels before and af...

Computer assisted design and simulation are essential stages in the process of creating a new technical product. The paper presents the utilization of cutting parts, equipping 2K-52 machines, as fundamental element in the development of modified cutting parts for KSW-460NE machine. This modification has been possible due to the study of the machine?s cutting parts with the help of CAD/CAE software. Adapting the cutting parts to KSW-460NE machine has been imposed by the geological-mining conditions of the coal laye...

It is important to analyze the current state of a person during respiration in individual breathing apparatus. For that reason, you need to register cardiorespiratory parameters of a human. Reusable simulators of breathing apparatus with specific hardware and software are used for these purposes. They allow simulating the conditions of the breathing, equivalent to primary breathing apparatus with chemically bound oxygen. During the development of the mine insulating self-rescuer simulator for the personnel of mini...

The use of a trenchless method of laying underground utilities is an advantageous alternative to the use of open methods. The method of vibro-impact immersion in the ground of steel pipes with an open front end is widely used in the construction of closed underground passages. Determining the trajectory of a clogged pipe is one of the most important operations in this technology. The article describes result of laboratory tests of prototype model of strapdown inertial navigation system designed in N.A. Chinakal In...

Introducing new technical solutions into practice is inseparably connected with a number of problems. In addition to obvious concerns about the quality, reliability and effectiveness of the solution, there are also social problems. They are related to distrust of employees regarding new solutions and is caused by a limited knowledge about the introduced product which is related to employees' concerns that such a product may disturb the existing state of balance. Therefore, in the case of introducing a new solution...

It is generally recognized that bus drivers are potentially being exposed to daily vibration levels higher than recommended by the international guidelines, especially on certain road types in the urban context. The literature shows up that the whole body vibrations exposure may contribute to low back pain and produce negative effects on the human health. The principal issue about the relationship between exposure and biodynamic response has not been clarified yet. The purpose of this paper is to determine the lev...

Impact of horizontal stresses on stability of underground workings in mines is a very important issue in underground mining. Identification of the initial state of stress in the rock-mass should be one of the main actions taken into account while designing and carrying out the mining activity in underground mines. The paper presents the azimuths difference method. This innovative method can be used to estimate numerical quantity of the perpendicular and parallel horizontal stress around underground mining excavati...

The paper presents the results of the analysis of the accuracy of estimates of copper resources in parts of a Cu-Ag deposit in the Lubin-Glogow Copper District (LGCD) (Poland) where samples were not collected (test areas). The estimation was based on the samples collected from excavations surrounding the areas scheduled for mining activities, while the evaluation of the accuracy of the estimates was based on data obtained during the exploitation. The estimates of resources in the examined area were based on a 3D s...

This paper addresses mechanisms of destruction of methane-saturated coal at micro- and macro-levels under dynamical impact due to methane transition from its natural bound to a free state. The focus is on possible destruction of practically impenetrable (crushed and pressed) coal. Our study is based on analysis of experimental investigations and computed modeling. The experimental investigations involved experiments with rock pre-cracking under explosive impact and analysis of photo images of coal microstructure a...

In order to ensure energy security, at national level, coal constitutes an important source, though its share in the energy mix is reduced in the past few years in favor of clean technologies and on the background of the fall in the energy consumption. Where can be located in the project of energy security, the production of coal, exploited in the mining units in the Jiu Valley and valorized at the two power plants, Mintia and Paroseni-components of the Hunedoara Energy Complex, amid the request for intervention f...

The dynamic changes occurring in recent years in the global industry have been referred to as the fourth industrial revolution. The main assumption behind this concept is extensive implementation of IT and ICT developments into production processes. Production processes should make maximum use of the latest technologies, thus leading to the creation of intelligent factories in the end. In such a factory, wireless network systems are supposed to quickly and reliably combine all the components of the production proc...

The paper deals with the influence of mining works on the transport in the area mainly the structural layers of transport-related engineering structures elements as railways, roads, railway crossings and the overall transport system. Long-term underground coal mining is usually associated with environmental impacts in the Moravian-Silesian Region in the Czech Republic. There are two types of undermined areas in mentioned region: District of Ostrava where the mines were closed and the mining phenomena are considere...

High level of mining in Polish copper mines, in the Legnica-Glogow Copper Belt (LGOM), caused an increasing amount of mining works to be carried out in difficult geological and mining conditions, for instance in the vicinity of remnants. Issues related to performing mining operations with the use of the room and pillar mining system in the vicinity of remnants is important in terms of work safety. Remnants are sites of the concentration of high stress values and may affect rock layers of the rock mass located in t...

Biomass belongs among renewable energy sources and its representation in national energy strategies is increasing due to the limited supplies of fossil fuels. One of the options for substitution of fossil fuels is short rotation cropping systems for woody biomass as a method of reclamation and revitalization of anthropogenic soil profiles during restoration activities in the areas after brown coal mining. The scope of the project "Methodology of sustainable agricultural management in anthropogenic damaged landscap...

During the extraction of minerals in underground mines or surface mines all material extracted must be transported long distances. This transport is usually done using belt conveyors. For the transport of rocks to a mine disposal site, a combination of multiple belt conveyors is necessary. This material must be poured from one belt conveyor to another. At the places of transfer, the upper protecting layers of the conveyor belts are often damaged due to the impact of the material. This deterioration of contact laye...

The purpose of this expertise is to evaluate by mathematical modeling the stability of the slag and ash deposit Compartment II Emergency Cicani, which will be carried out on the past site of the Cicani Mid-East compartment by elevation with a height of 3,0-3,5 m, up to + 178mdMN. The deposit will be made using the "thick slurry" technology, having as foundation the deposition of slag and ash existing in the Cicani Middle + East (existing) compartment, made by the hydraulic transport technology. The basses of the e...

The Cu-Ag deposit exploited in the Lubin-G?og?w Copper district (LGCD) in Poland is located in the Permian Rotliegend (sandstones) and Zechstein (shale and carbonate rocks) formations. The three main lithological series are not internally homogenous; within them, a total of 16 individual lithological units can be determined. The differentiation between lithological, mineralogical and geometallurgical ore properties is a criterion used to distinguish between main and individual lithologies in the deposit area. A sy...

The subject of the study was to characterize three deposit parameters of Pacific polymetallic nodules (the content and the abundance of nickel and the nodule abundance) using classical statistical methods. The input data points come from 448 sampling points of a bed area of about 48,000 km2 in the Clarion-Clipperton fracture zone (approx. 1,000 km west of the coast of Mexico). The sample points formed a pseudoregular grid with an average distance between them of about 10 km. On the basis of these, the basic statis...

A tough requirement for the development of the Partomchorr apatite-nepheline ore deposit containing rare-earth elements is a performance of environmental safety of production, because a sanitary zone of the projected mining and processing plant sides with the boundaries of the existing Simbozersky nature reserve and the created Khibiny national park. The studies have substantiated reasonability of the Partomchorr deposit development by a combined mining method; in the first stage step-by-step mining of four open p...

The technology of cutting with a laser beam today is a widespread solution for thermally cuttable materials. In mechanical engineering laser technologies currently, belong among the most progressive ways how a person can act on materials within the production process. Machining and processing materials using a laser is based on the conversion of light energy into heat energy. According to the active environment, a distinction can be made between three basic types of lasers - gas, solid state and semiconducting. Th...

The technology of oxy-cutting is a widespread solution for thermally cuttable materials nowadays. This article discusses the use of oxy-cutting technology on CNC machines. This technology is particularly suitable for unalloyed and low-alloy steels and cast steels. With the help of this technology, it is possible to cut sheets ranging from 3 to 1000 mm. For sheets with a thickness of 20 mm it is preferable to use a laser or plasma technology. When cutting with an oxy-fuel the workpiece it is initially heated on the...

In the era of dynamically changing business environment, planning in an enterprise is a part of decision making process. Therefore, a good prepared action plan is necessary. The rationality of decisions included in the plan depends on the quantity and quality of information available to the decision maker. Enterprises, including coal mines, are a set of interdependent phenomena. For that, we need to create decision support tools, the results of which will be visible in the future. Common tools include methods base...

The basis for safety management is the assumption that safe conditions as well as safe behaviour at work do not arise spontaneously, but must be worked out according to a pre-approved program. It is known that preventive actions have a much greater importance and sense than the removing of a damage resulting from accidents. Therefore, it is necessary to take measures aimed at improving the working conditions, equipment and conduct of employees hired in the mine. The presented article is an attempt at a practical a...

It often becomes necessary to evaluate the stress state of the rock massif when developing deposits of solid minerals. Timeous obtaining of data on geomechanical condition of rock massif provides the opportunity to estimate the level of stress and strain fields? development in the mining area and to address the possibility of the occurrence of unfortunate events associated with the rock pressure and gas-dynamic processes. Also, this information offers an opportunity to select effective and safe design schemes and ...

Typomorphic features of placer gold from alluvial deposits of the Bolshaya Kuonamka river basin, draining Eastern framing of the Anabar massif are studied in order to identify association types of primary sources and places, promising for their discovery. Based on identified indicators of gold, it is defined that, ore manifestations of low-sulfide gold-quartz association are the main primary sources of gold-bearing placers. Identification of palladium gold in association with platinoids, as well as its intergrowth...

During the process of conceptual designing of earthmoving or construction boom type machine we have must ensure that it is applicable in practice, meaning stable. Unfortunately, not every time is design of upper structure of such a machine ideal in consideration of position of centre of gravity and that is the reason why are stabilizing outriggers usually attached. This article talks about possibilities of use various schematic drafts of stabilizing outriggers for earthmoving and construction machines on the wheel...

The use of risk analysis methods in evaluating mining landscape. Mining landscape and landscape affected by mining activities is typical for the Moravian-Silesian Region. It is caused by coal mining, which took place on a large amount of territory in the past. Currently the mining is reduced, however, the effects of undermining will continue to persist in the area affected by mining activities. The development of mining is also closely related to the development of industry and industrial production. For evaluatio...

My presentation discusses facts about usage of brickmaking materials necessary for production. I named technological processes for extraction of brickmaking materials reaching to fifties of twentieth century. Their shift in modernization of technological processes in extraction of brickmaking materials and their current state. I concentrated on individual mechanical devices. From first machines serving in help of extraction, transportation and processing which have been entering extraction processes from the begin...

One of the reasons for spontaneous combustion of coal waste dumps is the air intake into the body of a dump. Despite the measures taken to isolate the bases and dump slopes, spontaneous combustion of dumps occur in many countries around the world. That breeds a hypothesis that spontaneous combustion process is facilitated by placement of a dump in the geodynamically active zone of the earth's crust. In geodynamically active zone, due to its high permeability, the interaction of the dumps with environment occurs. P...

The article is devoted to ergatic systems for training skills of handling breathing apparatus (mine self-rescuer) for staff protection in emergency situations. These systems represent hardware-software systems for simulation of physical activity, emergency situations and monitoring the status of a trainee. These tasks are interrelated and must be solved simultaneously in real time to ensure training process. The joint solution of these tasks implies the need to process large amounts of data within short time inter...

For generalized inversion, non L2-norm inversions have been widely used in geophysical inversion to obtain sharp and blocky models. However, problems such as the boundary of anomaly body obtained by inversion is not clear enough and the recovered residual susceptibility value is far less than or greater than the true susceptibility generally exist. In this paper a new 3D magnetic inversion approach based on residual node susceptibility is proposed. The residual node susceptibility model comes from residual block s...

The purpose of this article is to describe the modern methods of making models of quarry using the latest technologies such as laser scanning, land and air photogrammetry using Unmanned Aerial Vehicles (UAV) and their subsequent use in the planning of technological processes in the quarry. The first part of the article is dedicated to the creation of models with a focus on data collection and processing, compatibility of each format, the very creation of the model as well as the possibility of using the created mo...

Meta-siltstones are solid sedimentary rocks containing some clay material. Such geomaterial is taken mainly for the production of cement and garden paths. It can also be found in coal mines between coal beds. Processes of technological extraction of such natural material are always connected with the problems of its physical and mechanical behavior, therefore it is important to evaluate the basic deformation-strength properties. Moreover, if we consider the influence of the scale factor, we will get a more complet...

Coal mining causes undesirable terrain subsidence due to caving in of the overlying rocks into the already excavated space. Subsidence deforms the terrain, damages structures on the surface and water flows, which results in the formation of inaccessible wetlands and swamps, and these areas need to be reclaimed. The problem of large flooded areas as a result of mining activities also concerns an area known as пїЅKozinecпїЅ, which is located between KarvinпїЅ and Doubrava in the Czech Republic. That territory has lo...

The major changes occurred in Romanian mining industry imposed by the transition to the market economy, concentration of extraction to fewer output units in deeper seams, the high gas emission rates and coal rank, other current specific trends requires new methods to produce the optimum design and operation of a safe and economic methane drainage system. Under the circumstances, the paper describes a mathematical model together with a computer-aided optimization strategy to assist the analysis of the differences b...

Testing and certification of explosion-proof electrical equipment required for product conformity assessment are extremely important, taking into account the unexpected hazard of explosion occurrence due to potentially explosive atmospheres generated by mixtures of air-gas/dust. The explosion risk has to be minimized in order to ensure the health and safety of people and for preventing material damages. The new European Directive which regulates the protection to explosion field is the ATEX Directive 2014/34/EU wh...

One of the fundamental problems in coal mining industry is inefficient use of machinery and equipment. It is therefore necessary to take measures to improve the situation. An innovative system to test components of mining machinery control hydraulics presented in the article may support the initiative. This system enables reliable and efficient testing of components of the control hydraulics. This has an essential and practical significance, since hydraulic systems are commonly applied by many industries, in parti...

Changes of damage to the belt core that are not controlled during the exploitation can lead to dangerous accumulation of the defects (strains) in the cross cross-section. It can lead to serious weakness and even rupture of the belt. Early detection of the mic rodamage of the covers and evaluation of the increase speed of the damage allows the user to plan maintenance more precisely. Furthermore, it allows more effective cost management when conveyor belt maintenance is scheduled. In this paper, geometric data o f ...

Degraded post-mining areas have considerable potential for redevelopment. They are usually located in attractive urban areas and have convenient road and rail links to the rest of the city and other places in the region or country. These areas are often equipped with power, water and sewage systems. The redevelopment of these sites could take place in many different directions. They can be used to carry out production, service, commercial, residential and leisure activities. However, the unstabilized legal situati...

Working in mining companies, which extract coal, is very difficult and dangerous. Miners carry out activities in a hostile environmental in which there are many natural and technical dangers. The accumulation of such unfavorable factors makes it necessary to take actions to appropriately prepare the workers to work in these conditions. These actions mainly include different kinds of trainings before and during the work. One of the goals of these trainings is to make the workers get to know the threats that occur i...

Conditions of the microclimate prevailing in mine workings are one of the most important factors influencing on the comfort and safety of the working mine crews. This climate depends on parameters of the ventilated air stream and conditions prevailing in these workings. Parameters having the most important influence on the conditions of microclimate are temperature of the air and rock mass, humidity, velocity of air stream and average temperature of radiation of wall surface of the working. Nowadays, due to the la...

The paper begins with the idea that in a large energy enterprise, formed by merging several energy companies with a mining company, the organizational culture is the key to success. The paper underlines the close connection between the organizational culture and the enterprise efficiency. The organizational culture supports the economic and social efficiency, the adaptability in the competitive context and the company which has a strong organizational culture may be saved from the consequences of unfavorable econo...

Rosia Montana deposit is made up of several ore bodies; the natural factors are characteristics of each ore body. The deposit is accompanied by an extensive area of hydrothermal alteration, whose distribution has a complex character. Fast alteration and humidity were one of the factors that have been taken into account in order to achieve quarry. The quarry platform has reached at the level of the upper bottoms in the breccia area, which involves passing to the exploitation of the reserves included in these pillar...

The article describes the chosen Japanese production and maintenance management philosophies, such as Lean Management, kazien and TPM. Japanese approaches to the process of work organizing and work planning, workplace preparing, tasks, duties and responsibilities turn out to be the most effective and the most efficient in the world. The practical application of these philosophies entails achieving the measurable benefits by the companies that use them. The basis of these philosophies is the elimination of all kind...