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1

Influence of cutting parameters on the performance of plough during hard rock cutting in coal mining

Palaniappan Sathish Kumar, Chinnasamy Moganapriya, Pal Samir Kumar, Rathanasamy Rajasekar

Journal of Sustainable Mining

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2023

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Vol. 22. iss. 3

185--194

EN

Coal ploughs have proved very successful on many faces in various parts of the world. Recently, there has been a general tendency in longwall working to increase the speed at which the machine progresses along the coal face. An increase in production rate demands enhances either due to depth of penetration or cutting speed. This, in turn, results in increasing power demand and also the force acting on an individual pick. To get maximum efficiency from a cutting machine, a number of parameters need to be investigated. The first and foremost thing of interest is naturally the pick geometry. The cutting force can be expected to depend mainly on the rack angle and clearance angle of the tool. The second parameter is the cutting depth, which when enhanced, increases the rate of advancement and, at the same time, results in enhanced cutting force. This results in large power demand and increases wear of picks. Thirdly, cutting speed, in which higher cutting speed will increase the production rate but at the same time is expected to enhance the power demand and the cutting force. This paper aims at investigating the cutting efficiency of the plough by simulating the coal cutting operation in the laboratory. The effect of three main parameters like pick geometry, cutting depth, and cutting speed, on cutting efficiency have been studied in detail. The cutting force elevates at a faster rate with an increase in depth at higher speeds. The percentage increase in force is nearly 20% for a speed increase of 20%.

2

Study on pressure relief mechanism of hydraulic support in working face under directional roof crack

Zhang Jun, Liu Jianning, Wang Yajun, Yang Gang, Hou Shilin, Wang Yuanjun, He Manchao, Yang Jun

Archives of Mining Sciences

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2023

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Vol. 68, no. 1

103--123

EN

When mining coal from the working face, the main roof withstands the overlying strata. The main roof’s first weighting and periodic weighting may cause accidents, such as crushing the working face hydraulic supports. A mechanical model of the main roof was constructed, and the contributing factors of first and periodic weights on the main roof were examined in order to prevent such accidents. The thickness of the main roof was found as the most contributory factor to the main roof’s stability. Therefore, a new directional roof crack (DRC) technique is proposed, which produces directional cracks in the main roof through directional blasting and makes part of it collapse in advance so as to reduce the thickness and relieve the first and periodic weighting. To verify the effectiveness of DRC, the mechanism of DRC was analysed. A mechanical model of the hydraulic support was constructed, and the DRC techniques were tested on-site. Field experiments with a complete set of monitoring schemes showed that, with DRC technology, the roof periodic weighting interval decreased by 35.36%, and the hydraulic support pressure decreased by 17.56%. The theoretical analysis was consistent with the measured results. Therefore, the DRC technology is feasible and effective to ensure mining safety at the working face.

3

Shaft liquidation method adjusted for high precipitation associated with climate change impact

Szymała Jan, Całus Moszko Joanna, Janson Ewa, Sobczak Dagmara, Konsek Stanisław

Journal of Sustainable Mining

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2022

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Vol. 21, iss. 3

216--227

EN

In connection with the implementation of the international project TEXMIN within the framework of the RFCS fund, a project for the liquidation of the Głowacki Shaft in Rybnik (Poland) was undertaken, which takes into account the effects of climate change, i.e. evaluation of the increase of precipitation in the region. In addition to the standard research undertaken before liquidation activities, precipitation data recorded by the Institute of Meteorology and Water Management from 1995 to 2019 was collected and the precipitation variability was analysed. As a result, a method for liquidation of the shaft was selected consisting of constructing a permeable backfill column in the shaft and using a shaft pipe filled with permeable backfill material. Metallurgical aggregate was identified as a suitable backfill material, for which degradation tests, filtration coefficient tests and an assessment of its impact on water quality were carried out. It has been determined that a backfill column constructed in this manner can fulfil its function as a long-term gravity-driven water flow.

4

Geomechanical assessments of longwall working stability – a case study

Nguyen Phu Minh Vuong, Rajwa Sylwester, Płonka Marek, Stachura Waldemar

Archives of Mining Sciences

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2022

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Vol. 67, no. 2

333--354

EN

The stability of longwall mining is one of the most important and the most difficult aspects of underground coal mining. The loss of longwall stability can threaten lives, disrupt the continuity of the mining operations, and it requires significant materials and labour costs associated with replacing the damages. In fact, longwall mining stability is affected by many factors combined. Each case of longwall mining has its own unique and complex geological and mining conditions. Therefore, any case study of longwall stability requires an individual analysis. In Poland, longwall mining has been applied in underground coal mining for years. The stability of the longwall working is often examined using an empirical method. A regular longwall mining panel (F3) operation was designed and conducted at the Borynia-Zofiówka-Jastrzębie (BZJ) coal mine. During its advancement, roof failures were observed, causing a stoppage. This paper aims to identify and determine the mechanisms of these failures that occurred in the F3 longwall. A numerical model was performed using the finite difference method - code FLAC2D, representing the exact geological and mining conditions of the F3 longwall working. Major factors that influenced the stability of the F3 longwall were taken into account. Based on the obtained results from numerical analysis and the in-situ observations, the stability of the F3 longwall was discussed and evaluated. Consequently, recommended practical actions regarding roof control were put forward for continued operation in the F3 longwall panel.

5

Case study: Mechanism and effect analysis of presplitting blasting in shallow extra-thick coal seam

Sun Qiang, Shan Chegfang, Wu Zhongya, Wang Yunbo

Archives of Mining Sciences

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2022

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Vol. 67, no. 3

381--399

EN

The caving effect of the top coal caving is crucial for efficient mining. Using the Yushuling coal mine, Xinjiang province, China, as a case study, the coal and rock physical and mechanical parameters, such as the compressive, tensile, and shear strength values and hardness of the top coal and roof rock, were determined. The analysis of the effect of different factors on the blasting presplitting process was numerically simulated, and the optimal parameters of blast drilling were identified. Three presplit boreholes were implemented: in the workface, the workface’s advance area, and the two roadway roofs in the workface’s advance area. The optimal blasting drilling parameters and charge structure were designed. The field test results in the mine under study indicated that the top coal recovery rate of the 110501 fully mechanised top coal caving face was improved twice (from 40 to more than 80%), and an effective blasting presplitting was achieved. The proposed blasting presplitting method has an important guiding significance for fully mechanised top coal caving mining in Xinjiang and similar mining areas.

6

The assessment of the optimal time window for prediction of seismic hazard for longwall coal mining: the case study

Małkowski Piotr, Niedbalski Zbigniew, Sojka Wojciech

Acta Geophysica

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2021

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Vol. 69, no. 2

691--699

EN

The dynamic nature of rock mass damage during mining activity generates seismic events. This article shows, how the time window for the database infuences on the actual status of seismic hazard for the longwall mining area in one of Polish coal mines using Gutenberg–Richter law. A time window of 10–90 days was assumed with similar or shorter prediction times forecast on its basis. Additionally, for each seismic database the hazard prediction accuracy was determined. The analysis shows that the 10- and 20-day base periods are too short for prediction purposes. The higher-energy seismic events sometimes do not occur within such a short period of time, preventing regression analysis and parameter b determination. The best time window for the seismic hazard prognosis in given geological and mining conditions seems to be 30–50 days. The shorter periods cause the underestimation of the seismic hazard prognosis. Low range of tremor energies and the relatively low number of seismic events with high energy cause the low probability of prediction of the seismic mining events (10–40%) of the energy of min. 106 J, even for longer day base periods. The accuracy of hazard prediction, obtained from each seismic database period, was determined, using the developed coefcient of hazard autoregression CN. The analysis of the Gutenberg–Richter distribution should serve as complementary tool of seismic hazard prediction only.

7

Filarowy system wybierania węgla i jego rozwój w śląskich kopalniach

Gierlotka Stefan

Napędy i Sterowanie

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2020

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R. 22, nr 2

90--92

PL

W XVIII wieku na obszarze Górnego Śląska węgiel urabiano systemem chodników wybierkowych. Od chodnika podstawowego prowadzono prostopadle chodniki wybierkowe, z których starano się uzyskać jak najwięcej węgla. Ze względu na wzmożone ciśnienie górotworu występujące na skrzyżowaniu chodników pozostawiano filar węglowy podtrzymujący strop. System ten był mało wydajny i niebezpieczny.

8

True cost of coal: Coal mining industry and its associated environmental impacts on water resource development

Masood Noshin, Hudsone-Edwards Karen, Farooqi Abida

Journal of Sustainable Mining

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2020

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Vol. 19, iss. 3

135--149

EN

Coal is a strategic and essential resource that ensures quality of life, energy security and sustainable development. Being the cheapest source of energy, it is the second after oil that is used to generate 40% of the world's electricity. However, traditional and conventional coal fuel extraction can threaten human health bycontaminating air and water, harming land, and contributing to global warming. The environmental impacts associated with conventional methods of coal mining and consumption can affect all components of the environment, and these impacts may be beneficial or harmful, permanent or temporary, repairable or irreparable, and reversible or irreversible in nature. These effects require considering of changing the production and consumption of coalwithin a technological framework. Coal mining operationscan cause both quantitative and qualitative impacts on water systems in and around mining areas. This paper reviews the impacts of coal mining on water resource development. Land subsidence, disruption of hydrological channels, flooding, and contamination of water resources and depletion of water table are the major measurable impacts of mining activity on the hydrological environment.

9

COVID-19: A spectio-temporal analysis of air quality status in coking coalfields of India due to nationwide lockdown in India

Singh Amarjeet, Singh Gurdeep

Journal of Sustainable Mining

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2020

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Vol. 19, iss. 4

243--253

EN

A novel infectious corona virus disease (COVID-19) was identified in the month of December 2019. It has now been announced as a worldwide pandemic by the World Health Organization. COVID-19 pandemic has positive impacts on the environmental pollutants. In present work, Coalfield areas of Jharia Coalfields (JCF), India have been taken as a case study to evaluate the effect of the lockdown on air quality at 10 locations. This study had been selected to estimate the reduction in concentration of pollutants likePM10, PM2.5, SO2, and NOx during 3 Seasons (summer, Post-Monsoon and winter season) in the year 2019 in comparison to the concentration during the lockdown period i.e. from April 2020 to June 2020. The study areas selected was as fire affected and non-fire affected areas of Jharia Coalfield to identify the contribution of pollutants in the mining area to establish the baseline concentration of Business as usual (BAU) vs. the lockdown condition. The average reduction in concentration of PM10, PM2.5, SO2 and NOx was observed as 18%, 14%, 22% and 26% respectively during the lockdown period in comparison with the annual average concentration. As observed, the AQI value at the selected monitoring sites in JCF was 1.5 times higher in comparison to the lockdown period. This study will provide the confidence to the regulatory body for strict implementation of the applicable air quality standard/policies in the mining areas. The study will also provide confidence to the regulatory body in making emission control strategies for improvement of environmental conditions and human health.

10

Influence of the geology of coal deposits on their extraction and urbanistic development: a case study of Petřvald (Czech part of the Upper Silesian Basin)

Sivek Martin, Jirásek Jakub

Gospodarka Surowcami Mineralnymi

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2020

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T. 36, z. 2

21--40

EN

Petřvald is a typical mining town in the Czech part of the Upper Silesian Basin. Since the Petřvald sub-basin is limited by significant tectonic structures, its development was to a great extent independent from other areas of the basin and can serve as an example of the influence of the geological structure on the development of mining and residential communities. In the first phase of mining development (ca 1830 to 1844) first claims begin to occur in the area. Thick coal seams were available in shallow depths. Due to missing railway connection, the demand for coal was not very large and the village economy was focused on agriculture. In the second phase (1844 to 1871), the first underground mines start to operate in the area. They were situated in favorable areas with thin overburden. Also, the connection to the railway improved the sale opportunities and a significant share of the local population worked in the mines. The third phase of mining (1871 to 1963) brought still increasing demand for coal, which resulted in establishing new coal mines in geologically less favorable areas (thicker overburden, water-bearing horizons). From the 1930s to the end of the 1950s the extraction peaked, which coincided with the urbanistic and cultural climax. New housing was provided for miners and their families by the companies. The final stage of mining development (1963 to 1998) is connected with the steady decline of production and phase-out of mining. The reason was a lack of economically recoverable coal reserves connected to unfavorable geological conditions. We conclude that the results of studies concerning specific geological parameters of coal deposits can be used for more detailed analyses regarding the development of urbanism, or to explain its causes.

PL

Petřvald jest typowym miastem górniczym w czeskiej części Górnośląskiego Zagłębia Węglowego. Ponieważ subzagłębie Petřvald jest ograniczone znacznymi strukturami tektonicznymi, jego rozwój był w dużej mierze niezależny od innych obszarów subzagłębia i może służyć jako przykład wpływu struktury geologicznej na rozwój wspólnot górniczych i mieszkalnych. W pierwszej fazie rozwoju górnictwa (ok. 1830–1844) w okolicy zaczynają pojawiać się pierwsze roszczenia. Grube pokłady węgla były dostępne na płytkich głębokościach. Z powodu braku połączenia kolejowego zapotrzebowanie na węgiel nie było bardzo duże, a gospodarka wsi koncentrowała się na rolnictwie. W drugiej fazie (1844–1871) pierwsze podziemne kopalnie zaczęły działać na tym obszarze. Umieszczono je w sprzyjających obszarach z cienkim nadkładem. Połączenie z koleją poprawiło także możliwości sprzedaży i warunki życia znacznej części miejscowej ludności pracującej w kopalniach. Trzecia faza wydobycia (1871–1961) przyniosła wciąż rosnące zapotrzebowanie na węgiel, co zaowocowało utworzeniem nowych kopalń węgla na obszarach mniej korzystnych geologicznie (grubszy nadkład, poziomy wodonośne). Od lat trzydziestych do końca lat pięćdziesiątych ubiegłego wieku wydobycie osiągnęło szczyt, co zbiegło się w czasie z punktem kulminacyjnym urbanistyki i kultury. Firmy zapewniły nowe mieszkania dla górników i ich rodzin. Ostatni etap rozwoju górnictwa (1961–1998) związany jest ze stałym spadkiem produkcji i likwidacją wydobycia. Przyczyną był brak ekonomicznie wydobywalnych zasobów węgla związanych z niekorzystnymi warunkami geologicznymi. Stwierdzamy, że wyniki badań dotyczące konkretnych parametrów geologicznych złóż węgla można wykorzystać do bardziej szczegółowych analiz dotyczących rozwoju urbanistyki.

11

A preliminary assessment of climate change impacts – implications for mining activity in Polish coal regions

Janson Ewa, Markowska Małgorzata, Łabaj Paweł, Wrana Aleksander, Zawartka Paweł

Archives of Mining Sciences

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2020

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Vol. 65, no. 3

703--717

EN

It is widely known and accepted that the global climate is changing with unprecedented speed. Climate models project increasing temperatures and changes in precipitation regimes which will alter the frequency, magnitude, and geographic distribution of climate-related hazards including flood, drought and heat waves. In the mining industry, climate change impacts are an area of research around the world, mostly in relation to the mining industry in Australia and Canada, where mining policies and mitigation actions based on the results of this research were adopted and applied. In Poland, there is still a lack of research on how climate change, and especially extreme weather events, impacts mining activity. This impact may be of particular importance in Poland, where the mining industry is in the process of intensive transition. The paper presents an overview of hazardous events in mining in Poland that were related to extreme weather phenomena. The needs and recommended actions in the scope of mitigating the impact of future climate change on mining in all stages of its functioning were also indicated. The presented analyses and conclusions are the results of the first activities in the TEXMIN project: The impact of extreme weather events on mining activities, identifying the most important factors resulting from climate change impact on mining.

12

A new prediction model of surface subsidence with cauchy distribution in the coal mine of thick topsoil condition

Jiang Yue, Misa Rafał, Tajduś Krzysztof, Sroka Anton, Jiang Yan

Archives of Mining Sciences

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2020

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Vol. 65, no. 1

147--158

EN

Coal is the main energy source in China, but its underground mining causes surface subsidence, chich seriously damages the ecological and living environments. How to calculate subsidence accurately is a core issue in evaluating mining damage. At present, the most commonly used method of calculation is the Probability Integral Method (PIM), based on a normal distribution. However, this method has limitations in thick topsoil (thickness > 100 m), in that the extent of the calculated boundary of the subsidence basin is smaller than its real extent, and this has an undoubted impact on the accurate assessment of the extent of mining damage. Therefore, this paper introduces a calculation model for surface subsidence based on a Cauchy distribution for thick topsoil conditions. This not only improves the accuracy of calculation at the subsidence basin boundary, but also provides a universal method for the calculation of surface subsidence.

13

Financial Liabilities of the Hard Coal Mining Sector in Poland

Pepłowska Monika, Gawlik Lidia

Inżynieria Mineralna

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2019

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R. 21, nr 1/2

293--299

EN

In this article, the authors analyze the hard coal mining sector. Global, European and national trends are presented. The financial situation of mining enterprises and the financial liabilities of this sector are described in detail.Fees and charges to the state budget and local budgets are analyzed in detail. The problem of competitiveness of Polish mining enterprises and their contribution to the functioning of the national economy has been noticed. The article ends with the most important conclusions.

PL

W artykule autorzy analizują sektor wydobycia węgla kamiennego. Przedstawione są trendy globalne, europejskie i krajowe. Szczegółowo opisano sytuację finansową przedsiębiorstw górniczych i zobowiązania finansowe tego sektora, szczegółowo analizując opłaty i obciążenia budżetu państwa i budżetów lokalnych. Zauważono problem konkurencyjności polskich przedsiębiorstw górniczych i ich wkładu w funkcjonowanie gospodarki krajowej. Artykuł kończy się najważniejszymi wnioskami.

14

Application of the Cobb-Douglas production function to study the results of the production process and planning under turbulent environment conditions

Rybak Aurelia

Gospodarka Surowcami Mineralnymi

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2019

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T. 35, z. 3

99--118

EN

The article presents the possibility of using the Cobb-Douglas production function for planning in a turbulent environment. A case study was carried out – the Cobb-Douglas function was used to examine the condition of the Polish hard coal mining industry and the progress which has been made after undertaking certain activities aimed at increasing the competitiveness of coal companies over recent years. Only the correct and confirmed identification of the causes of irregularities in the production process can allow for the introduction of effective remedies. The effectiveness of the solutions proposed by the author has been confirmed thanks to the simulation during which the impact of the proposed production strategy on the parameters of the CD function was examined. Three variants of production functions models were created and production productivity rates and marginal substitution rates were determined. The results enabled the verification of the progress of restructuring as well as identification of the origin of the observed problems and comparison of the current state with the results of analyses carried out in previous years. Scenarios of possible trend developments for the factors introduced into the function model in order to present remedial measures that could improve the process of hard coal extraction were created. The scenarios were created using the ARIMA class models. Which scenario is the most favourable was determined. A computer program, created by the author, for optimising the level and use of labor resources at the level of the entire coal company has been presented.

PL

W artykule zaprezentowano możliwość zastosowania funkcji produkcji Cobba-Douglasa do planowania w warunkach turbulentnego otoczenia. Przeprowadzono studium przypadku – funkcja Cobba-Douglasa wykorzystana została do zbadania stanu polskiego górnictwa węgla kamiennego oraz postępów podejmowanych w ostatnich latach działań mających na celu zwiększenie konkurencyjności spółek węglowych. Utworzono modele funkcji produkcji w 3 wariantach, wyznaczono wskaźniki produktywności produkcji oraz krańcową stopę substytucji. Pozyskane rezultaty umożliwiły zweryfikowanie postępów restrukturyzacji, określenie głównych przyczyn zidentyfikowanych problemów oraz porównanie obecnego stanu z wynikami analiz prowadzonych w ubiegłych latach. Tylko prawidłowa i potwierdzona identyfikacja przyczyn nieprawidłowości w procesie produkcji umożliwić może wprowadzenie właściwych środków zaradczych. Skuteczność zaproponowanych przez autorkę rozwiązań została potwierdzona dzięki symulacji, podczas której zbadano wpływ proponowanej strategii produkcji na parametry funkcji CD. W celu wskazania środków zaradczych mogących usprawnić proces wydobycia węgla kamiennego, utworzono scenariusze możliwego rozwoju trendów czynników wprowadzonych do modelu funkcji. Scenariusze utworzono z wykorzystaniem modeli klasy ARIMA. Określono, który scenariusz jest najbardziej korzystny. Zaprezentowano także stworzony przez autorkę program komputerowy, który ma za zadanie zoptymalizowanie poziomu i wykorzystania środków pracy żywej na poziomie całej spółki węglowej.

15

Z historii kopalń węgla kamiennego w wybranych dzielnicach Dąbrowy Górniczej. Komunikat

Ciepiela B.

Wiadomości Górnicze

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2018

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R. 69, nr 1-2

33--40

PL

Historia górnictwa węglowego w Dąbrowie Górniczej ma 210 lat, bowiem wydobywanie węgla rozpoczęto w 1785 r., a zakończono z chwilą unieruchomienia ostatniej kopalni, kopalni „Paryż” w 1995 r. (z dniem 30 czerwca 1995 r. zakończono wydobywanie węgla, a 30 grudnia 1996 r. zakończono jej likwidację). W związku ze 100-leciem nadania praw miejskich Dąbrowie Górniczej wydana została monografia miasta w trzech częściach. W części drugiej opisano historię poszczególnych dzielnic, wchodzących w skład miasta. Wobec niekompletnych wiadomości o historii górnictwa węglowego na terenie niektórych dzielnic, w artykule przedstawiono bardziej szczegółowo historię funkcjonowania kopalń w dzielnicy Gołonóg.

EN

The history of coal mining in Dąbrowa Górnicza is 210 years old, as coal mining started in 1785 and ended when the last mine, „Paryż" mine, was closed down in 1995 (on 30 June 1995 coal mining was terminated and on 30 December 1996 the mine's liquidation was completed). In connection with the 100th anniversary of granting city rights to Dąbrowa Górnicza, a monograph on the city was published in three parts. The second part describes the history of the individual districts that make up the city. In view of incomplete information about the history of coal mining in some districts, the article presents, in more detail, the history of the functioning of mines in the district of Gołonóg.

16

A priori determining of the accuracy of mineral resources volume determination

Staňková H., Šafář V., Dandoš R.

Gospodarka Surowcami Mineralnymi

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2018

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T. 34, z. 3

5--22

EN

Several surface measurement methods for determining the volume of deep or layered stone exist. One of the key indicators of coal extraction efficiency in open cast mining is to determine the volume of excavated rock. Procedures for determining the volume have been used for many centuries. Determining the extracted volume or layered material has been a periodically recurring role of mine -surveying practice, and mine surveyors apply different methods for its determination. The incorrect determination of the rock volume may result in large economic losses of the mining enterprise. The choice of the method for determining the volume depends on the deadline by which the determined volume has to be submitted to the superior components or the mining enterprise management, as well as on the requirements for accuracy of the volume determination, and a financial limit beyond which this volume determination has to be done. Secondary conditions for determining the volumes include the level of personnel training in the individual procedures and methods of measuring and calculating volumes, the technical standards of the enterprise, the applied instrumentation, hardware and software. The article compares the values of the accurately defined mathematical solid (a cylindrical segment) to the methods of calculating the volume normally used in mining and surveying practice and programs commonly used to calculate volumes in order to determine the threshold value of the systematic deviation in input measurements to determine the volume. The mathematical model is the basis for determining the correct volumes of the extracted material. The surface of the drawn or layered material does not form a smooth surface as a mathematical model. The process of determining volume errors on the mathematical model has been verified on the real body of coal deposition. The comparison of the determination of the errors between the digital terrain model on the mathematical body and the real homogenization coal stock is presented at the Conclusion of the article.

PL

Jest kilka metod pomiaru powierzchni dla określenia objętości zasobów surowców mineralnych. Jednym z kluczowych wskaźników wydajności wydobycia węgla w górnictwie odkrywkowym jest określenie objętości wydobytej skały. Procedury określania objętości były stosowane przez wiele stuleci. Określanie wydobytej objętości lub warstwy surowca jest okresowo powtarzającą się praktyką geodezyjną, a geodeci stosują różne metody jej określania. Nieprawidłowe określenie objętości skały może skutkować dużymi stratami ekonomicznymi przedsiębiorstwa górniczego. Wybór metody określania objętości zależy od terminu, w którym ustalona objętość musi być przekazana do jednostek nadrzędnych lub zarządzania przedsiębiorstwem wydobywczym, a także od wymagań dotyczących dokładności określania objętości oraz od środków finansowych przeznaczonych na ten cel. Drugorzędne warunki określania objętości obejmują: poziom szkolenia personelu w poszczególnych procedurach i metodach pomiaru i obliczania objętości, standardy techniczne przedsiębiorstwa, stosowane oprzyrządowanie, sprzęt i oprogramowanie. W artykule porównano wartości dokładnie zdefiniowanej bryły matematycznej (segment cylindryczny) z metodami obliczania objętości zwykle stosowanej w praktyce górniczej i geodezyjnej oraz programy powszechnie stosowane do obliczania objętości w celu określenia wartości progowej odchylenia systematycznego w pomiarach wejściowych do określenia objętości. Model matematyczny jest podstawą do określenia prawidłowych objętości wydobytego materiału. Proces określania błędów objętościowych w modelu matematycznym został zweryfikowany na rzeczywistym składowisku węgla. Porównanie błędów między cyfrowym modelem matematycznym a rzeczywistym składowiskiem węgla homogenizacyjnego przedstawiono na końcu artykułu.

17

Maszyny górnicze w dobie czwartej rewolucji przemysłowej

Bartodziej K.

Napędy i Sterowanie

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2017

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R. 19, nr 7/8

30--31

PL

Większość nowoczesnych przedsiębiorstw doskonale rozumie, że konkurencyjność rynkowa zależy dziś od sukcesywnego podnoszenia wydajności procesów produkcyjnych. Cel ten najefektywniej osiąga się poprzez zwiększenie automatyzacji poszczególnych etapów ciągu technologicznego, jego monitorowanie i systematyczne eliminowanie „wąskich gardeł”. Założenie to leży u podstaw czwartej rewolucji przemysłowej. Wiedzą o tym także producenci maszyn górniczych, przekładając ten globalny trend na specyfikę swojej branży, w której procesem produkcyjnym jest wydobycie węgla.

18

Stan zagrożeń wodnych w kopalniach węgla kamiennego w związku z ich restrukturyzacją

Bukowski P., Szczepański A., Niedbalska K.

Przegląd Geologiczny

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2015

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Vol. 63, nr 10/1

616--621

EN

In recent years, symptoms of water hazards associated with mine closure were escalated. The presence of the water hazard can be related even to underground mine submersible dewatering systems in the areas of closed mines. This is connected with a loss of control of the majority of the mine workings in the areas of liquidated mines, where processes significantly changing the hydrogeological and geomechanical conditions are occurred. To avoid the worsen of the state of water hazards in coal mines it is necessary to: improve the existing procedures and law regulations relating to assessment, monitoring and control of water hazards and highlight this issue in hydrogeological documentations, as well as improve the quality of hydrogeological documenting and change the procedure of making opinion and approving of documentations.

19

Dokumentowanie warunków hydrogeologicznych w związku z restrukturyzacją górnictwa węgla kamiennego

Bukowski P., Szczepański A., Niedbalska K.

Przegląd Geologiczny

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2015

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Vol. 63, nr 10/1

612--615

EN

After novelization of a new geological and mining law in 1994, a lot of changes in the functioning of the hard coal mining – associated with the multifold mining industry restructure – have occurred. These activities resulted in the liquidation of almost half of Polish coal mines, ore and other mineral mines, as well as in the significant changes in the hydrogeological conditions in the areas of influence of mining activities. In each case, together with the organizational transformation it was necessary to create the hydrogeological documentations or supplement to these documentations in accordance with the currently applicable regulations and procedures. Against the background of the experience from this period, it was found that some of the solutions improve the condition and quality of documenting, and influence on the improvement of mine, public and environmental safety, while some others worsen them. It is believed that it is possible to improve this state of affairs by making changes in the law regulations and procedure of hydrogeological documenting, evaluation and approval of documentation. In order to achieve it, it is necessary to make changes in the procedure for evaluation of documentation, and determine requirements for institutions, government and people with entitlements of expert within the group XVII of issues related to water hazards, as well as in the relation to the content of the text part of the hydrogeological documentation.

20

Quality assessment of occupational health and safety management at the level of business units making up the organizational structure of a coal mine: a case study

Korban Z.

International Journal of Occupational Safety and Ergonomics

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2015

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Vol. 21, No. 3

373--381

EN

The audit of the health and safety management system is understood as a form and tool of controlling. The objective of the audit is to define whether the undertaken measures and the obtained results are in conformity with the predicted assumptions or plans, whether the agreed decisions have been implemented and whether they are suitable in view of the accepted health and safety policy. This paper presents the results of an audit examination carried out on the system of health and safety management between 2002 and 2012 on a group of respondents, the employees of two mining departments (G-1 and G-2) of Jan, a coal mine. The audit was carried out using the questionnaire developed by the author based on the MERIT-APBK survey.