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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...

One of the commonly present gas hazard in hard coal mines methane hazard. The most endangered region by this hazard, during ventilation of longwall in пїЅU from boundariesпїЅ system is the crossing with ventilation roadway (so called пїЅupper corner of longwallпїЅ). Accumulation of methane in this place results from its release from goaf. Therefore, in order to decrease methane concentration in this region, auxiliary ventilation devices are used. They are aimed to supply to this place such an amount of fresh air, ...

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...

The article presents the results of asymmetrical disk tools laboratory tests. This type of mining tools can be used for mechanical mining of hard rocks, among others in the solution of innovative roadheader head, presented on SGEM conference in 2016. The study was conducted at a dedicated laboratory stand, with an installed drive power of 80 kW. Stand consists of rotating rock sample, mined by special plate equipped with asymmetrical disk tools. The rock is mined using undercutting technique, also known as Wohlemy...

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...

The work given has been aimed at consideration of methodical approaches for the feasibility study of perspective in mineral deposits development, and based on it, preliminary ranking of criteria which should be applied relative to the Arctic solid mineral deposits. Authors used a formal logic method (analysis synthesis). It was revealed that both the domestic and foreign approaches cannot be applied directly for the feasibility studies of the Arctic solid mineral deposits because they consider the arctic condition...

Increasing the efficiency of the mechanization of the brown coal layers extraction requires updating the equipment from the technical endowment of the brown coal pits. The EsRc 1400?30/7?630 excavating machine with impeller represents the main tool from the endowment of the brown coal pits in our country. The cup runs displacement operation of the rock, its performance being found with the highest rate in labor productivity growth and reduce specific costs. It is realised, in this paper, with the help of the CAD/C...

In the paper underground monitoring measurement system for continuous measurement of load changes in instrumented rockbolts was presented. The use of anchor casings creates an effective method of protecting underground mine excavations in KGHM Polska Mied? S.A. mines. Foundation for technical assumptions of original monitoring method was trial measurement period carried out in two underground copper mines of KGHM Polska Mied? S.A. between 2005 and 2008. The main aim was to receive interaction between load variatio...

Great problem of mechanical hard rock mining is low durability of mining tools. In Department of Mining, Dressing and Transport Machines, AGH UST in Cracow new solutions of mining tools and their holders were developed. In paper, a special tool to replace traditional rotary pick (so called crown-shaped pick), new lubricated holder for rotary-tangential picks, asymmetrical disc cutters, results of laboratory, field and industrial tests were described. Crown-shaped pick has the same type of handle as standard soluti...

The acceleration and deceleration periods during each race of a vertical transport installation may be considered as periods of transitional processes where kinematics and dynamic measures variations take place (acceleration, speed and forces) as well as some electric measures (actuating motorпїЅs current). Considering T as the duration of the process, for the minimisation of the installed power, the minimisation of the energy dissipated in the system is imposed during the transitional period: ? ? ? ? ? ? T 2 1 0 ...

The present step brings forward a series of calculation methods for the parameters of the anchored support, their number being therefore the expression of the difficulty when describing the phenomena which occur during the interactive cooperation between the anchors and the surrounding rock. The methods used the most by European mining are the analytical methods (the Bieniawski method, the self-supporting beam method and the method of the interaction between the massive rock пїЅ anchor пїЅ time) and the numerical ...

The paper presents numerical modelling results for ventilating a blind excavation, if there is a leakage into a failure zone. The leakage value of air seeping through the failure zone (binomial law of resistance) was estimated by a formula describing in-situ tests results at the Kola Peninsula mines. The blind excavation ventilation process was simulated based on a previously developed two-stage methodical approach: 1st stage пїЅ calculation of aerodynamics with applying a standard ?k ?? ? -turbulence model; 2nd s...

This paper reviews a developed technology of mining steeply dipping mineral occurrences by steeply inclined sublayers, taking into account spatial position of sublayers relative to ore shoot. Parameters of phase and steeply inclined sublayers, till reaching final open pit depth, have been justified during studies. An order of steeply inclined layers formation on frontal open pit edges is determined depending on location of mineral resources on footwall and hanging wall. A new method of reactivation of a non-operat...

The scientific paper deals with the multi-criterion optimization of the teeth that are used on the buckets of bucket wheel excavators. From past theory and practice, it is known that geometry of the tooth greatly influences the cutting parameters and the endurance and the strength of the tooth itself. The dependencies between the cutting forces, the penetrating forces, the specific energy on the rake angle and the relation between this last one and the robustness of the tooth are somewhat contradictory, so in the ...

The aim of this article is to describe the possibility of increasing the service life of the rod eye on a tilting platform that is used to tilt heavy barrels between the two differences in heights in transport lines. This mode of transport was selected for the lack of space in a given area of a production line, which does not allow the implementation of an inclined plane, which would be structurally easier. Rotating those barrels by 90пїЅ that is achieved during this way of transport, is desired for subsequent tec...

The annual extraction of aggregates in the Czech Republic is between 45 - 50 mega tones. [5]. Many studies for better results of quarries are undertaken. In this paper is solved the question of optimizing. It is solved the optimizing of cost on coal quarries also. The situation on stone and coal quarries is different. There are requirements for stone production, but the production of coal is in decrement. Comparison and solving both situations seems to be useful. The relationships between different production proc...

The annual extraction of aggregates in the Czech Republic is between 45 - 50 mega tones. [5]. Many studies for better results of quarries are undertaken. In this paper is solved the question of optimizing. The relationships between different production processes in quarries are very important matter. On the relationships between the manufacturing processes depends the economic effect of operation. The paper presents patterns in the organization of mining, which mutually related. Using computational methods and the...

One of the frequent problems that needs to be addressed when mining coal deposits is the presence in the working face of cohesive materials having high mechanical strength in relation to the average rock to be excavated. These are generally called пїЅhard formationsпїЅ or пїЅhard inclusionsпїЅ and are in the form of either continuous layers or boulders. This problem is of particular importance in Europe where lignite deposits are exploited in large opencast mines utilizing Bucket Wheel Excavators (BWEs) as the mai...

Conveyor belt loop operates in a system comprising a series of belt segments and the splices between them. Splices are the weakest parts of a loop. Depending on the splicing technology, the spliceпїЅs strength, durability and reliability may vary significantly. Vulcanized splices offer the highest strength and durability. In the case of steel cord belts, such splices are practically the only technology available. In the case of textile belts, adhesive and mechanical splices may also be used. Although mechanical sp...

The authors have revealed particularities in destruction of the rock mass by the system of borehole charges and substantiated the least seismic hazardous blasting schemes which allow decreasing out-contour disturbances and providing more qualitative crushing of rock mass. It has been shown that for the boreholes with 250 mm diameter the least seismic hazardous blasting scheme is one with borehole line placed at the angle of 105пїЅ to the bench wall. At that, the stress level in the out-contour rock mass decreases ...

This paper presents results for a research of the possibility of applying the combined methods of mining in construction of the underground premises in coal mines in the Republic of Serbia. The purpose of this study is to process the application and effects of combined (standard) methods of a pit remises construction through coal with a goal to find new technology of construction which will result in more productive and rational ways of their building. This study includes the analysis of the construction of pit pr...

During mining activities the constructions on the surface are usually influenced. Extent and time course of negative influences is dependent on array of geological, hydro geological and mining conditions and last not least also on the way of implementation of line construction (i.e. how it is ready to react to these awaited influences). In the past for that reason the array of calculation methods working with more or less precision with using for prognosis of influence of mining activities (i.e. influence of minin...

Mining activity represents an important source of harmful emissions into the environment and general impact on the environment. In the Ostrava industrial region this activity represents one of the most serious sources of potential risk for the environment and public health. The article deals with the problem of emissions of a mining enterprise from the point of view of air pollution and potential influence of air pollution on public health for the population. In particular it deals with air pollution impacts from ...

Healthy and safe working conditions underground, especially in areas with potentially explosive atmospheres depend mainly on the method of operation and management of the ventilation system. For underground extraction of coal are running a complex network mining vertical, horizontal and inclined role extraction, transportation and evacuation the surface. Associated system of mining works has the air network to ensure the oxygen necessary for workers, diluting explosive gases and toxic substances and preparations t...

A switch to combined automobile-conveyor transport is offered, i.e. cyclical and continuous method, at an early stage of the development of steeply falling deposits, based on usage of advantages of the safe intensive development of working zones along the steep open pit edges at a number of open pit mines on the territory of Kazakhstan. It is possible to shift from traditional approaches of cutting a new pit banks by advance of the cut trench with the minimum dimensions on the round-shaped open-pit fields. Decreas...

When it comes to workplaces characterized by a high degree of hazard and liability, such as mine intervention and rescue in major risk environments the most important element is the convergence of the skills required by job and skills of the individual, this being the guarantee of successful vocational selection. Along with psychological selection, training / retraining and physical training in conditions as close as possible to the reality of future interventions, under the action of stress factors that cause neg...

Uranium mining is the first step in the nuclear fuel cycle to produce energy. In the nuclear fuel cycle, main steps are; Mining / Milling, Conversion, Enrichment, Nuclear Fuel Fabrication, Reactors, Reprocessing of the spent fuel and Waste Management. In the first step, there are three main methods for uranium ore extraction. These are; Open Pit Mining, Underground Mining and In-Situ leaching (ISL/Lixiviation). All forms of mining methods create health risks for people and hazard for the environment. In this study...

The article deals with the treatment of terrain and the following forestry reclamation in the Erv?nice area situated near the city Most at the foot hills of Ore Mountains. It considers the impal of using secondary energy products for the reclamation of this previously mined area on ground water, surfac ewater, air and noise. The area had previously been used as sands and gravel waste disposal and in the last years efore there clamation there had been some natural restoration of the biotopes on the brought sands ub...

According to the European Commission, critical raw materials are defined as пїЅthose which display a particularly high risk of supply shortage in the next 10 years and which are particularly important for the value chainпїЅ. Therefore, when considering a raw material criticality, two main parameters are taken into account: its economic importance and supply risk. Technologies which a decade ago were considered high tech became current today, and raw materials once considered as minor, have gained importance. Parti...

The article summarised course of activities in trachyandezit (Latit) quarry (tephrite) in Bra?any location starting from mining working permit phase until termination of activities and subsequent redevelopment and reclamation of quarry residual pit. Redevelopment and reclamation of territory after mining is one of the main activities of Severo?eskпїЅ doly a.s.The paper provides data on the Bra?any opencast mine, namely the geography, environmental situation, climatic, hydrologic, geological and hydro-geological co...

The scientific paper proposed deals with the reliability analysis of the average usage time of the brake pads as components of the braking system of the industrial front-end loader and transporter machinery used in mining operations in Romania. The research was conducted at the request of several mining companies in Romania, that are using the front-end loader and transporter machinery in their daily operations. The study is based on the empirical information and the preliminary reliability results that were recor...

Non-electrical equipment has been used for over 150 years in industries in which likely to occur a potentially explosive atmospheres and a great deal of experience has been gained in the application of protective measures for reducing the risk of ignition of such atmospheres to an acceptably safety level. For using non-electrical equipment in potentially explosive atmospheres, it became necessary to produce ignition protection concept standards which clearly defined these protective measures and incorporated the e...

The Cukar 2 east ore body represents the latest explored ore body within the Mucim Mine with possibilities to enter exploitation stage in near fututre. Calculated ore-bearing coefficient in the Cukar 2 east ore body was 0.40%, meaning that within the ore body boundaries 60% of mass is not mineralized somehow, which is compatible with remaining three ore bodies within the Buchim porphyry copper mine. The calculated value of variation coefficient (V) has shown value of 71.39% that is in the range of 43-100%, which d...

The solving of European Commission (Research Fund for Coal and Steel) research project пїЅBucket wheel excavators operating under difficult mining conditions including unmineable inclusions and geological structures with excessive mining resistanceпїЅ is under way from 2015 to 2018. The Brown Coal Research Institute j.s.c. is a member of the research team comprising Czech, Polish, Romanian and Greek technical universities and companies. The main task of the year 2016 was the realisation of the three long term meas...

The paper presents the investigation results of rock mass state change regularities taking into account geological and mining factors by complex methods. The authors consider complexing of results from the cluster analysis of seismic events with numerical modelling of stress state in the rock mass on a case study of the Yukspor deposit (the Khibiny rock massif, Murmansk region, Russia). The time and dimensional analysis of the Yukspor depositпїЅs seismic regime was performed. The cluster groups of seismic events w...

One of the most significant elements of every machine operation is its control system. Proper design, construction and operation of the control system is the key factor for correct and efficient operation of a machine. This particularly applies to mining machinery operating in hazardous environments and exposed to loads which cannot be fully predicted. Such machines must be therefore characterized by high reliability, durability, readiness and safety. In order to fulfil all these requirements, a machine must be eq...

Transport systems are an important component of intra-plant logistics. Their role is the provision of transport services in order to ensure the efficient functioning of the individual processes. The quality and reliability of the transport system greatly affects the efficiency of intra-plant logistics. The extractive and mining industries are particularly sensitive to these indicators and parameters of transport technologies. The use of transport technology in this industry is dependent on a number of factors. The...