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Tytuł:
Financing sources of exploration works in the light of risk related to their activity
Źródła finansowania prac eksploracyjnych w świetle ryzyka związanego z ich realizacją
Autorzy:
Kustra, Arkadiusz
Kowal, Barbara
Ranosz, Robert
Powiązania:
https://bibliotekanauki.pl/articles/1841499.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
mining
exploration
junior mines
financing
górnictwo
eksploracja
spółki junior mines
finansowanie
Opis:
The article presents an overview of the determinants of exploration works and the definition of the role of junior mines in those processes. Junior mines, as special purpose vehicles, focus on the stages of exploration and documenting of the deposits, without going into the operational stage related to the exploitation. Due to their nature, those entities finance their activities with equity capital in the form of share issues on the capital markets, addressing their proprietory securities to investors who accept a high level of risk. e largest stock exchanges on which the exploration companies obtain the required funds have been identified, and the trends that complement capital raising, concerning the involvement of private equity funds, have been presented.
W artykule przedstawiono przegląd uwarunkowań prac poszukiwawczych oraz określenie roli spółek typu junior mines w tych procesach. Junior mines, jako spółki celowe, koncentrują się na etapach poszukiwania i dokumentowania złóż, nie wchodząc w fazę operacyjną związaną z eksploatacją. Ze względu na swój charakter, podmioty te finansują swoją działalność kapitałem własnym w formie emisji akcji na rynkach kapitałowych, kierując swoje papiery wartościowe do inwestorów akceptujących wysoki poziom ryzyka. Zidentyfikowano największe giełdy, na których spółki eksploracyjne pozyskują źródła finansowania oraz przedstawiono aktualne tendencje pozyskiwania kapitału, dotyczące zaangażowania funduszy private equity.
Źródło:
Inżynieria Mineralna; 2021, 1; 87-97
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability analysis of security pillars with dimension 10 x 10 m fromed by ore of mineral body during the exploitation of the "Trepça" mine in Stantërg
Autorzy:
Zeqiri, Rafet
Gashi, Jahir
Kutllovci, Festim
Powiązania:
https://bibliotekanauki.pl/articles/89020.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
mines
exploitation
pillars
security
Opis:
The "Trepça" mine in Stanterg consists from several mineral bodies, which if compared to the mineral bodies in the North and South part of mine can be found in different size. Their size in the horizontal plane ranges from 300–7000 m2 and as a matter of fact in the primary exploitation phase, only about two of thirds part of ore is used, while the remaining ore is used like pillars in the secondary stage with special methods. Since the beginning of exploitation at "Trepça" mine landfill, the security pillars are left in dimensions 10 x 10 m, on the schedule of chess fields, at distances from 16 to 20 m and all pillars at those distances are stable and over-dimensioned. In this paper we investigate the stability of the securing pillars with dimensions 10 x 10 m, with surface S = a * b = 10 * 10 = 100 m2 with a distance between them of 10 to 22 m. Pillar stability analysis aims to increase the safety factor along with the increase of exploitation depth.
Źródło:
Mining Science; 2019, 26; 37-44
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Naval mine detection system based of FPGA circuit
Autorzy:
Wołoszyn, M.
Łubkowski, J.
Chomnicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/97240.pdf
Data publikacji:
2011
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
FPGA
naval mines
electrical conductivity
Opis:
Electrochemical processes take place in a metal object immersed into sea water even if an anticorrosive coating is applied [1]. As a result, flowing field appears around the object. There are naval mines between many other objects situated in the sea. Naval mines can be put in the seabed in order to be more difficult to detect by sonars. Such a mine is located on the line demarking two environments of different electrical conductivity. The results of a computer analysis of the influence of seabed’s electrical conductivity on the electric field’s disposition around a mine model are shown below. Also, a naval mine detection system based on the FPGA circuit is presented.
Źródło:
Computer Applications in Electrical Engineering; 2011, 9; 60-68
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The reserve base of hard coal in Poland: a review of changes in the process of restructuring of the coal mining sector
Autorzy:
Buła, Z.
Jureczka, J.
Krieger, W.
Kwarciński, J.
Powiązania:
https://bibliotekanauki.pl/articles/1204909.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
hard coal
reserves
restructuring
mines
Polska
Opis:
On the turn of the 1980s and 1990s several unfavourable events affected the Polish hard coal mining. Critical for the mining sector were breakdown of the country's request for energy and drop of coal prices on the world market. In the period of 1989-1998, Poland's economic reserves (balance sheet resources) of hard coal decreased by 17%, and the industrial reserves dropped by 41%. Simultaneously, there was and there is still in progress a programme of technical and economic restructuring of the hard coal mining. According to the restructuring programme of coal mining, the total yearly output of Polish hard coalmines will drop from 101 million t in 2003 to 80 million t in 2020. However, there should be taken into consideration that in consequence of 2003-2020 liquidation of consecutive coalmines, ceasing of mining of the coal balance sheet reserves contained in seams below 1.50 m thick as well as other factors may limit the recoverable reserves of coal. In this context, it is highly possible that in the period 2010-2020 the availability of coal resources will be one of the critical problems of hard coal mining in Poland.
Źródło:
Polish Geological Institute Special Papers; 2002, 7; 41-44
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model of process management system in enterprises of the hard coal mining industry
Autorzy:
Bijańska, Jolanta
Wodarski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/409898.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
hard coal mines
model
process management system
Opis:
The primary objective of this paper is to present a model of a process management system developed to support the restructuring of Polish enterprises of the hard coal mining industry. The development of this model required research in three stages using several research methods. The stage I of the research was oriented towards the recognition of the existing state of knowledge in the scope of previously developed models of process management in enterprises. At this stage, a method of reviewing the literature, the analysis and synthesis of the results of considerations, was used. The stage II was oriented towards presenting of the current state of knowledge in the field of process management to the managerial staff of mines in order to identify their needs, capabilities and preferences. The research were attended by 24 managers from PGG SA and JSW SA. At this stage, the method of targeted free-form interview and discussions, was used. The stage III of the research was oriented towards the development of a process management system model in enterprises operating in the hard coal mining industry, based on the scientific achievements to date in the field of process management and consensus on the needs, preferences and capabilities of mine managerial staff with regard to its specific elements. At this stage, the method of analysis and synthesis was used. The results of the research presented in this publication are primarily addressed to the managerial staff of polish hard mines, as they provide a synthesized response to the problem of the lack of consistent process management guidelines that could set a standard within a mining enterprise. The model presented in the publication is of a general nature, although it may provide a basis for the application of process management for mines.
Źródło:
Management Systems in Production Engineering; 2020, 2 (28); 112-120
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of computer programs to solve ventilation issues in Vietnamese coal mines
Wykorzystanie programów komputerowych do rozwiązywania problemów wentylacyjnych w wietnamskich kopalniach węgla
Autorzy:
Bui, Hoa
Życzkowski, Piotr
Łuczak, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/318979.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
wentylacja
kopalnie
Wietnam
ventilation
coal mines
Vietnam
Opis:
Having enjoyed an economic upsurge in recent years, Vietnam is now recording increased demand for electrical energy. Its production, for the most part, relies on the coal mining industry, thus resulting in a strong upward trend in mining volumes. Being geologically complex, Vietnamese mines are characterised by a complicated structure of their headings. The local ventilation systems are also affected by there being very few automatic dams and an by increases in airflows delivered to the mine. For this reason, in order to analyse airflows and maintain the proper control of ventilation systems, computer software is required. The article offers a comparison of computer programs – Kazemaru, VentGraph and VentSim – as employed for use in Vietnamese mines. The assessment covered the manner in which these programs are used and how their output data are presented, as well as their range of applications in the conditions of Vietnamese coal mines.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 119-128
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on surveying technology applied for DTM modelling and volume computation in open pit mines
Autorzy:
Wajs, J.
Powiązania:
https://bibliotekanauki.pl/articles/972330.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
digital terrain model (DTM)
photogrammetry
volume
opencast mines
Opis:
The spatial information systems of mining company can be used for monitoring of mining activity, excavation planning, calculations of the ore volume and decision making. Nowadays, data base has to be updated by sources such as surveying positioning technologies and remote sensed photogrammetry data. The presented paper contains review of the methodology for the digital terrain model, i.e. DTM, modelling and obtaining data from surveying technologies in an open pit mine or quarry. This paper reviews the application of GPS, total station measurements, and ground photogrammetry for the volume accuracy assessment of a selected object. The testing field was situated in Belchatow lignite open pit mine. A suitable object had been selected. The testing layer of coal seam was located at 8’th pit sidewall excavation area. The data were acquired two times within one month period and it was connected with monthly DTM actualization of excavation. This paper presents the technological process and the results of the research of using digital photogrammetry for opencast mining purposes in the scope of numerical volume computation and monitoring the mines by comparison of different sources. The results shows that the presented workflow allow to build DTM manually and remote sensed and the accuracy assessment was presented by the volume computation pathway. Major advantages of the techniques are presented illustrating how a terrestrial photogrammetry techniques provide rapid spatial measurements of breaklines 3D data utilized to volume calculation.
Źródło:
Mining Science; 2015, 22; 75-83
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of induced seismic events clustering in equivalent dimension spaces in chosen Rudna Mine panels
Badanie grupowania się indukowanych zjawisk sejsmicznych w przestrzeni wymiarów równoważnych na przykładzie wybranych pól ekslopatacyjnych ZG Rudna
Autorzy:
Lizurek, G.
Lasocki, S.
Powiązania:
https://bibliotekanauki.pl/articles/348627.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
grupowanie zjawisk sejsmicznych
zagrożenie sejsmiczne
kopalnie miedzi
wymiary równoważne
seismicity clustering
seismic hazard in mines
copper mines
equivalent dimensions
Opis:
The study of clustering of an induced seismic event was carried out to find out whether the temporal clustering of smaller events in different parameters can be observed before and after the high energy events (Ml > 3) from different mining panels of the Rudna Mine. The method chosen for the analysis was a study of the temporal variation of the fractal dimension of the seismic events parameters - the interevent epicentral distance (dr), the interevent time (dt), logarithm of seismic energy (lE) and interevent energy coefficient (dlE). The transformation of seismic source parameters changed into the equivalent dimension (ED) space was done before the temporal behavior studies. The transformation allowed for the estimation of the fractal dimension of different parameters using the same method - correlation fractal dimension, and then easily compares the obtained temporal changes of fractal dimension with different parameters. The effect of clustering is expressed by a decrease of the fractal dimension, which is connected with the similarity of the events parameter and values. The temporal changes of the fractal dimension of seismicity before strongly induced events could then indicate some initiation phase of the process leading to the high energy release.
Na podstawie danych o zjawiskach sejsmicznych, które wystąpiły w wybranych oddziałach w ZG Rudna dokonano analizy grupowania się zjawisk w przestrzeni parametrów równoważnych złożonej z wartości dystrybuanty rozkładu parametrów lokalizacji (odległość pomiędzy kolejnymi wstrząsami - dr) i energii (logarytm energii - lE i bezwzględna różnica pomiędzy logarytmami energii kolejnych wstrząsów dlE). Celem tej analizy było sprawdzenie czy przed wystąpieniem zjawiska o dużej energii (powyżej 10/7 J) dochodzi do charakterystycznych zmian rozkładu występowania wstrząsów o mniejszej energii. Analizę oparto o badanie czasowej zmienności wymiaru fraktalnego. Grupowanie się zjawisk odzwierciedla się zmniejszaniem wartości wymiaru fraktalnego. Zmiany w czasie wartości wymiaru fraktalnego przed wystąpieniem silnego zjawiska sejsmicznego mogą wskazywać na występowanie procesu przygotowawczego prowadzącego do wystąpienia silnego zjawiska.
Źródło:
AGH Journal of Mining and Geoengineering; 2012, 36, 2; 203-216
1732-6702
Pojawia się w:
AGH Journal of Mining and Geoengineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Kishnica mines on pollution of the Graçanka River and water wells nearby, Kosovo
Autorzy:
Kadriu, Sadija
Sadiku, Milaim
Kelmendi, Mensur
Aliu, Mehush
Mulliqi, Ismet
Hyseni, Arbër
Powiązania:
https://bibliotekanauki.pl/articles/1844372.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
mines
pollution
Graçanka River
water quality
water wells
Opis:
Mining is an important economic activity in Kosovo. Artana and Kishnica mines are a part of the Trepça industrial complex and the increased exploitation of deposits has resulted in undesirable impact on the environment around the mining sites. More specifically, the mining activity caused water pollution. The aim of the study was to assess the physico-chemical parameters and presence of heavy metals (Ni, Zn, As, Cd, Pb, Cr, Mn, Fe) in water samples of the Graçanka River and household wells in the area. The Inductively Coupled Plasma-Mass Spectrometer (ICP-MS) was used to determine metal concentrations. Samples were collected from five sites along the Graçanka River and from four private water wells during a period from September to November 2019. Concentrations of heavy metals in the Graçanka River were as follows Mn (24–1203 μg∙dm–3), Fe (11–785 μg∙dm–3), Ni (4–299 μg∙dm–3), Pb (2–22 μg∙dm–3), As (1–5 μg∙dm–3), Zn (344–1646 μg∙dm–3), Cr (1–2 μg∙dm–3) and Cd (<1 μg∙dm–3). The well waters were polluted by multiple metals (Mn > Fe > Ni > Pb) with concentrations of Mn 1834–36089 μg∙dm–3, Fe 158–3535 μg∙dm–3, Ni 82–1882 μg∙dm–3, Pb 5–45 μg∙dm–3, As 2–19 μg∙dm–3, Cd 1–12 μg∙dm–3, Zn 979–23474 μg∙dm–3 and Cr 1–2 μg∙dm–3. The pollution has been caused by industrial (mining-related) and urban discharges. The contamination originates from the release of flotation process waste and from the leaching of the tailings dam. Most probably, rainwater has washed contaminants into the aquifers and the Graçanka River. River water is not suitable for irrigation and well water is not suitable for consumption or irrigation. Wastewater should be treated before discharge and the tailings area should be remediated in order to stop the pollution.
Źródło:
Journal of Water and Land Development; 2021, 48; 16-21
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The status and prospect of mining technology in Vietnam underground coal mines
Stan i perspektywy technologii górniczych w kopalniach podziemnych w Wietnamie
Autorzy:
Duong Duc, Hai
Quang, Dao Hong
Turek, Marian
Koteras, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/318463.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
kopalnie podziemne
Wietnam
technologia
underground coal mines
Vietnam
technology
Opis:
Vietnam has the 13th largest hard coal reserves globally, with the reserves totaling 2.22 billion tonnes, and estimated resources of 4.07 billion tonnes. Coal use is playing an increasing role in the energy mix and according to current planning, this role is to increase further. In parallel with the development of the Vietnamese coal sector, underground mining also underwent many stages of improvements, especially in the last two decades. This paper analyzes the achievement and the state of the mining technology applied into the underground mining by the Vietnam National Coal - Mineral Industries Holding Corporation Ltd. (VINACOMIN) during 20 year period and proposes the recommendations for the sustainable development of Vietnam underground mining.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 147-155
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Lasso and Elastic-Net Regularized Generalized Linear Model for Predicting Blast-Induced Air Over-pressure in Open-Pit Mines
Model Lasso i uogólniony model liniowy elastycznej siatki do prognozowania nadciśnienia wywołanego wybuchem w kopalniach odkrywkowych
Autorzy:
Bui, Xuan‑Nam
Nguyen, Hoang
Tran, Quang Hieu
Bui, Hoang‑Bac
Nguyen, Quoc Long
Nguyen, Dinh An
Le, Thi Thu Hoa
Pham, Van Viet
Powiązania:
https://bibliotekanauki.pl/articles/318532.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
Lasso model
kopalnia odkrywkowa
wybuchy
open pit mines
explosives
Opis:
Air overpressure (AOp) is one of the products of blasting operations in open-pit mines which have a great impact on the environment and public health. It can be dangerous for the lungs, brain, hearing and the other human senses. In addition, the impact on the surrounding environment such as the vibration of buildings, break the glass door systems are also dangerous agents caused by AOp. Therefore, it should be properly controlled and forecasted to minimize the impacts on the environment and public health. In this paper, a Lasso and Elastic-Net Regularized Generalized Linear Model (GLMNET) was developed for predicting blast-induced AOp. The United States Bureau of Mines (USBM) empirical technique was also applied to estimate blast-induced AOp and compare with the developed GLMNET model. Nui Beo open-pit coal mine, Vietnam was selected as a case study. The performance indices are used to evaluate the performance of the models, including Root Mean Square Error (RMSE), Determination Coefficient (R2), and Mean Absolute Error (MAE). For this aim, 108 blasting events were investigated with the Maximum of explosive charge capacity, monitoring distance, powder factor, burden, and the length of stemming were considered as input variables for predicting AOp. As a result, a robust GLMNET model was found for predicting blast-induced AOp with an RMSE of 1.663, R2 of 0.975, and MAE of 1.413 on testing datasets. Whereas, the USBM empirical method only reached an RMSE of 2.982, R2 of 0.838, and MAE of 2.162 on testing datasets.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 8-20
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protection of vehicles against mines
Autorzy:
Śliwiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/244465.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
armoured vehicle
mines
IEDs (improvised explosive devices)
reactive armour
Opis:
The paper presents the threats posed by mines and IEDs (improvised explosive devices) to vehicles conducting different combat operations. The typical reaction of a pressure impulse after explosion was presented. The parameters of a pressure impulse having an impact on the hull underside were discussed. The graphic impact of the shape of the hull underside on the propagation of pressure wave resulting from the detonation of the explosive was presented. The structural solutions applied now in the world, able to protect the hull underside against mines, IEDs and RPG-rockets were discussed. The soldier protection means in form of seats with safety belts and protective clothing capable of minimising the impact of an explosion on soldiers in a vehicle were mentioned. A concept of a flexible explosive reactive armour being mounted underneath the hull of an armoured vehicle was presented. The structure of protective armour and its assembly to an armoured vehicle as well as the destructive impact of mines and IEDs containing both blasting charge and shaped charge utilising the principle of either the EFP or a shaped charged jet were discussed. Structural analysis on solutions used world-wide in vehicles resistant to mines was performed and their resistance to mine explosion under the hull and under the wheels was given. The idea of a vehicle with increased resistance to various mines, IEDs and RPG-rockets was presented. The vehicle's hull with suspended flexible explosive reactive armour having the rumple zone in the lower part and the RPG-net on sides, which is mounted to hull's movable arms was proposed. The advantages of proposed above structural solutions were discussed.
Źródło:
Journal of KONES; 2011, 18, 1; 565-572
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dolphin-Inspired Target Detection for Sonar and Radar
Autorzy:
Leighton, T.
White, P.
Powiązania:
https://bibliotekanauki.pl/articles/950221.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sonar
radar
cetacean
dolphin
whale
mines
explosives
nonlinear
wake
Opis:
Gas bubbles in the ocean are produced by breaking waves, rainfall, methane seeps, exsolution, and a range of biological processes including decomposition, photosynthesis, respiration and digestion. However one biological process that produces particularly dense clouds of large bubbles, is bubble netting. This is practiced by several species of cetacean. Given their propensity to use acoustics, and the powerful acoustical attenuation and scattering that bubbles can cause, the relationship between sound and bubble nets is intriguing. It has been postulated that humpback whales produce ‘walls of sound’ at audio frequencies in their bubble nets, trapping prey. Dolphins, on the other hand, use high frequency acoustics for echolocation. This begs the question of whether, in producing bubble nets, they are generating echolocation clutter that potentially helps prey avoid detection (as their bubble nets would do with man-made sonar), or whether they have developed sonar techniques to detect prey within such bubble nets and distinguish it from clutter. Possible sonar schemes that could detect targets in bubble clouds are proposed, and shown to work both in the laboratory and at sea. Following this, similar radar schemes are proposed for the detection of buried explosives and catastrophe victims, and successful laboratory tests are undertaken.
Źródło:
Archives of Acoustics; 2014, 39, 3; 319-332
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coal heritage from Southern Belgium: A preservation and computerized management of coal concessions data
Autorzy:
Devleeschouwer, X.
Decupere, B.
Delforge, X.
Roche, M.
Hance, L.
Powiązania:
https://bibliotekanauki.pl/articles/1204907.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
coal mines
mining data
urban environment
information system
Belgium
Opis:
From the past centuries until the seventies, underground coal mining activities have played an important role in the suburban development of western European coal basins. After closure of collieries, the impact of this activity on a fast growing urban environment is still obvious and cannot be underestimated. Changes in hydrological regime, water and soil pollution, sudden collapse or ground instability are risk factors not to be minimized. Old mining and related industrial sites have now to be revalidated and underground infrastructures and city planners and local authorities cannot ignore mineshafts. This is only possible if the huge amount of available mining data is preserved and their information computerized. These mining data represent an essential component of urban geology that must be integrated in an easy access geographic information system. The old coal districts in southern Belgium serves as a case study for developing an appropriate methodology.
Źródło:
Polish Geological Institute Special Papers; 2002, 7; 79-86
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tests of methane desorption and emission from samples of hard coal in the context of mine closures through flooding
Autorzy:
Krause, Eugeniusz
Karbownik, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/1839015.pdf
Data publikacji:
2019
Wydawca:
Główny Instytut Górnictwa
Tematy:
methane hazard
closing mines
flooding mines
methane emission
safety
underground mining
zagrożenie metanowe
zamykanie kopalni
zalewanie kopalni
emisja metanu
bezpieczeństwo
górnictwo podziemne
Opis:
Forecasts of methane emissions during and after flooding a closed gassy hard coal mine and the evaluation of possible methane migration to the surface in post-mining areas, after cutting off the vertical ventilation workings of hard coal mines from the surface, provide valuable information which can help to ensure public safety. This article presents research into the influence of changes in the hydrostatic pressure of a water column in a flooded mine on the volume of methane emission and migration from hard coal seams, during and after the flooding of a closed mine. The tests were conducted based on a modified research method developed by the French National Institute for Industrial Environment and Risks (INERIS), France, and the Central Mining Institute (GIG), Katowice, Poland. A test stand for gas desorption and autoclaves for emissions, under controlled pressure and temperature, were used. The tests were conducted and changes in pressure in the autoclaves over time were observed. The observations led to the conclusion that water inhibits methane desorption and emission from coal to varying extents, depending on the hydrostatic pressure exerted. Based on the conducted tests, developed a model of methane emission into flooded goafs was developed. A method of determining index k2 was also developed, which lowers the forecast volume of methane emission into goafs depending on the value of the hydrostatic pressure of the water column and the level of submersion. Results of the tests form the basis to calculate forecasts in the developed model of methane emission into the goafs of a mine during its closure, which, as a consequence, enables the identification of the level of methane hazard and the selection of preventive measures aimed at combating methane hazard during and after the closure of a gassy mine.
Źródło:
Journal of Sustainable Mining; 2019, 18, 3; 127-133
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 103

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