Optimization of mines parameters when mining coal reserves in difficult mining and geological conditions

2020 ◽  
pp. 3-11
Author(s):  
A.V. Dzhigrin ◽  
V.V. Melnik ◽  
M.G. Lupiy ◽  
V.A. Bakin
Keyword(s):  
Geological Conditions ◽  
Mining Coal ◽  
Coal Reserves

scholarly journals Peculiarities of using classification indicators of the coal metamorphism degree for predicting the hazardous coal seams properties

2020 ◽  
Vol 201 ◽  
pp. 01014
Author(s):  
Mykola Antoshchenko ◽  
Elvira Filatieva ◽  
Vladyslav Yefimtsev ◽  
Vadym Tarasov
Keyword(s):  
Spontaneous Combustion ◽  
Chemical Activity ◽  
Mining Engineering ◽  
Coal Seams ◽  
Mining Operations ◽  
Emergency Situations ◽  
Specific Composition ◽  
Geological Conditions ◽  
Definition Of ◽  
Mining Coal

Currently, there is no reliable regulatory framework for determining the hazardous properties of coal seams, including the propensity of coal for spontaneous combustion. Under relatively identical mining engineering and geological conditions for mining coal seams, the probability of emergency situations is determined to a large extent by the genetic properties of coal. The research methodology is based on the classical definition of metamorphism, which characterizes the change in the composition and properties of coal. The analysis involves indicators that directly or indirectly characterize the elemental composition of organic and mineral mass, chemical activity and physico-mechanical properties. This will allow to establish a specific composition and properties that contribute to the manifestation of certain hazardous properties of coal seams during mining operations. It is shown that the modern industrial classification does not take into account the change in the organic and mineral constituents of coal, which does not make it possible to use it unchanged to predict the hazardous properties of coal seams.

scholarly journals Operational Control of the Feed of the Harvester

2019 ◽  
Vol 105 ◽  
pp. 01009
Author(s):  
Sergey Kubrin ◽  
Konstantin Kopylov
Keyword(s):  
Operational Control ◽  
Coal Seams ◽  
Mining Operations ◽  
Technological Processes ◽  
Mining Enterprise ◽  
Geological Conditions ◽  
Operational Management ◽  
Mining Coal ◽  
The Right ◽  
Planning Production

Comparison of normative and actual indicators on mining testifies to inefficient work of the excavating equipment. The results of the correlation analysis of the speed of movement of the harvester relative to the section of the support with the readings of methane sensors revealed a significant dependence. When conducting mining operations in complex geological conditions at great depths, a joint step-by-step carrying out of various technological processes is required to ensure the preparation, opening and excavation of reserves and the creation of safe conditions for mining coal seams. At the same time, efforts should be made to minimize time, human and energy resources. In this regard, of particular importance is the right choice of the program of operational management of technological processes of mining, monitoring the implementation of technological operations for the timely detection of deviations from the selected mode, adjustment of the established current modes of operation of technological processes and the development, if necessary, measures aimed at reducing the risks of accidents. A promising direction of solving this problem is the use of modeling methods. The developed models of technological processes of the mining enterprise will allow planning production and supporting decision-making in the implementation of operational management.

Research and Practice of Safe Mining Technology in Steeply Inclined Coal Seam under Complicated Geological Conditions

2012 ◽  
Vol 203 ◽  
pp. 509-513
Author(s):  
Xiang Ren ◽  
Rong Zhao ◽  
Xiao Li Chui
Keyword(s):  
Coal Seam ◽  
Coal Face ◽  
Mining Technology ◽  
Current State ◽  
Production Safety ◽  
Geological Conditions ◽  
New Ideas ◽  
Mining Coal ◽  
Cutting Height ◽  
And Control

Based on the analysis of the current state of mining in steeply inclined coal seam, combination with the mining status of the 3up 509 fully mechanized mining coal face with a max 28°inclination and a high cutting height,The key technologies was Study on the anti-sliding of coal face equipment, ends and advance support, water prevention and control as well as other key technology of steeply inclined coal seam, Good technical and economic results achieved in actual production,Support capability of production safety in mine enhanced,This article Opened up new avenues and new ideas for the promotion of mechanized mining technology under similar geological conditions.

Analysing the Sustainable Development of Coal Resources in Shanxi Province from the Perspective of Coal Reserves

2014 ◽  
Vol 962-965 ◽  
pp. 1746-1752
Author(s):  
Chun Chen Wei ◽  
Chun Xiang Hu ◽  
Zhi Wei Yu
Keyword(s):  
Sustainable Development ◽  
Production Capacity ◽  
Shanxi Province ◽  
Coal Production ◽  
The Sustainable Development ◽  
Coal Resources ◽  
Geological Conditions ◽  
Coal Reserves ◽  
Production Target ◽  
Production Conditions

The coal production capacity is determined by many factors, such as geological conditions, production conditions, transportation conditions, environmental factors, coal reserves and so on. The coal reserves play a fundamental role in these factors. Therefore, this paper analyzes whether existing reserves in Shanxi Province could support coal production target which is made by government of Shanxi Province after the integration of coal resources from the perspective of coal reserves. The purpose of this paper is to achieve better sustainable development of coal resources in Shanxi Province.

scholarly journals Comparison of Coal Reserve Estimation Methods, Case Study PT. Bukit Asam Area, South Sumatra, Indonesia

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Taufiq Muhammad Wijayanto ◽  
Wahyu Wilopo ◽  
I Gde Budi Indrawan ◽  
Sunarko Sunarko
Keyword(s):  
Nearest Neighbor ◽  
Coal Extraction ◽  
Estimation Methods ◽  
Coal Reserve ◽  
Reserve Estimation ◽  
Geological Conditions ◽  
Distance Weighted ◽  
Coal Reserves ◽  
Inverse Distance

The calculation of coal reserves is influenced by the dimensions or size of the coal deposit. There are several types of coal reserve calculation methods, and the use of these methods is adjusted to existing geological conditions. Each method will produce a different amount of coal reserves, although the location is the same. Besides, the amount of coal mining that can be produced is primarily determined by the mine design, especially the optimal slope as a basis for mining pits in the coal extraction. This research aims to estimate coal reserves based on existing pit designs using a variety of methods. Data on coal thickness and topography are used as the basis for reserves estimation. Coal reserve estimation is conducted in several methods: nearest neighbor point (NNP), inverse distance weighted (IDW), and kriging using Surfer 13 software. The results of the reserves estimation indicate that kriging is the best method by providing the smallest error value with an RMSE value of 0.67 and coal reserves of 27,801,543 tons.

Methane content and relative methane releasability versus occurrence depth of coal seams in Mạo Khê mine

2020 ◽  
pp. 26-37
Author(s):  
Dik Thang Fam ◽  
Tuan An’ Fan ◽  
K. S. Kolikov
Keyword(s):  
Coal Mining ◽  
Mine Drainage ◽  
Mining Industry ◽  
Methane Content ◽  
Gas Content ◽  
Coal Seams ◽  
Methane Drainage ◽  
Geological Conditions ◽  
Coal Reserves ◽  
Full Conversion

Methane is one of the critical safety concerns in the modern coal mining industry. The current outputs per coal faces induce risk of explosion even at low gas content of coal. Methane drainage is an obligatory component of a coal mining technology; it enables full conversion of coal resources into coal reserves, safe operation of coal mine and utilization of coal methane. The approaches to introduction of norms on methane concentration in return ventilation air and to rating of coal mines by the gas criterion in the leading coal-producing countries are reviewed. Based on the analysis of underground measurements, the content and relative releasability of are estimated as functions of the occurrence depth of coal seams in Mạo Khê mine. The methane content-occurrence depth curves are obtained. Considering the geological conditions of the mine, the promising degassing technologies based on enhancement of coal permeability are discussed, and the required modification of standards to be imposed on geological exploration data for the purpose of introduction of new methane content prediction methods is described. The main problems of pre-mine drainage of methane are examined. The urgent nature of methane drainage in Mạo Khê mine is validated.

scholarly journals Substantiating the criteria for applying selective excavation of coal deposits in the Western Donbass

2018 ◽  
Vol 26 (1) ◽  
pp. 158-164 ◽  
Author(s):  
V. O. Sotskov ◽  
O. O. Podvyhina ◽  
N. I. Dereviahina ◽  
D. S. Malashkevych
Keyword(s):  
Energy Efficient ◽  
Energy System ◽  
Ash Content ◽  
Thin Layers ◽  
Coal Deposits ◽  
Geological Conditions ◽  
New Energy ◽  
Waste Rocks ◽  
Coal Reserves

The provision of the energy system of Ukraine with a stable supply of coal in the long term demands calculation of the capacity of the exploitable deposits. Ukrainian deposits are characterized by insignificant thickness and complicated mining-geological conditions, which significantly complicates the mining process. Therefore, it is necessary to develop and use new energy-efficient technologies of coal mining. The article evaluates the criteria of usefulness of thin layers of deposits in the Western Donbass, which contains 25 bn t of coal, i.e 21.3% of total resources of the country, for processing in selective technology. According to the geologicstructural factor, we distinguished the fields of mines of hydrodynamically “open” and “close” types, the water inflows of which differ by a factor of ten. Taking the example of the mines of the east group, we ascertained the potential of the most promising coal reserves, which are appropriate for mining using selective technology. It was established that in these conditions, selective technology of coal excavation would not only allow a decrease in the ash content of the coal output, but would also prolong the period of the industries` operation. Backfilling of mined-out areas decreases the technogenic load on the underground and surface hydrosphere, decreases the subsidence of the surface and the volume of waste rocks.

scholarly journals PATTERNS OF CONVEYOR EXCAVATION DEFORMATION IN MINING AND GEOLOGICAL CONDITIONS OF THE KRASNOLYMANSKA COAL MINE

2020 ◽  
pp. 176-183
Author(s):  
Oleksandr Shashenko ◽  
◽  
Vladyslava Cherednyk ◽  
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Field Research ◽  
Coal Mass ◽  
Longwall Face ◽  
Influence Zone ◽  
Geological Conditions ◽  
Mining Coal ◽  
Seam Mining ◽  
Mass Deformation

Purpose. carrying out field researches of the conveyor excavation`s state and establishing geomechanical patterns based on the data, that were obtained in the mining and geological conditions of the Krasnolymanska coal mine. Methodology. Mine field researches of the conveyor excavation deformed state, which is under the influence of the longwall face, and moves in time and space, were carried out. The observation was performed by using a measuring station, which included five measuring points. The results of measurements were generalized and the excavation contour deformation features at various stages of mining coal seam were revealed. Results. Dependencies, that characterize the process of coal mass deformation around the mine at various stages of its exploitation. are obtained. During exploitation processes of the conveyor excavation relative to the longwall face, that gradually pass through four geomechanical situations in mining and geological conditions of the Krasnolymanska coal mine, are established – outside influence zone, in the influence zone, within the longwall face, outside the longwall face. These situations differ in the nature of roof and floor deformation, the vertical convergence of which at each stage changes linearly in time and goes to zero at a distance of 23 meters outside the longwall face. These indicators give reason to consider the roof rocks in the longwall as that sink without breaking the continuity, and also to perform the calibration of geomechanical models based on this. Scientific novelty of the research is new patterns establishment of the coal mass deformation, which contain the conveyor excavation, in the process of the coal seam mining in specific mining and geological conditions. Practical value of the research planned to be carried out on the basis of data obtained after field research is allowed to develop a geomechanical model of active methane accumulation zones searching. The model is applied for further industrial use purposes and to improve the safety of coal mining.

scholarly journals Numerical simulation study of mining process of upper and lower walls of normal and reverse faults

2021 ◽  
Vol 2083 (3) ◽  
pp. 032071
Author(s):  
Bian Zhuang
Keyword(s):  
Coal Seam ◽  
Numerical Models ◽  
Hanging Wall ◽  
Coal Pillar ◽  
Normal Fault ◽  
Reverse Fault ◽  
Coal Seams ◽  
Working Face ◽  
Geological Conditions ◽  
Mining Coal

Abstract Mining coal seams near faults are prone to various mine disasters, and different mining sequences have different effects on coal seam disasters. Under this background, the numerical models of normal fault hanging wall, normal faultfoot wall, reverse fault hanging wall and reverse fault footwall under the same geological conditions are established. It is found that the stress concentration of coal pillar is the largest in the mining process of hanging wall of normal fault and footwall of reverse fault, and the possibility of inducing coal pillar rockburst is the largest. Affected by the fault, the coal pillar abutment stress between the working face and the fault shows an upward trend. When mining the coal seam near the fault, various methods such as hydraulic fracturing should be adopted to reduce the coal pillar abutment stress and reduce the risk of mine disasters.

scholarly journals Mining industry in Mozambique

2021 ◽  
Vol 6 (2) ◽  
pp. 114-120
Author(s):  
J. J. Z. Caixao
Keyword(s):  
Underground Mining ◽  
Rapid Development ◽  
Mining Industry ◽  
Mineral Resources ◽  
Open Pit ◽  
Open Pit Mining ◽  
Coal Production ◽  
Geological Conditions ◽  
Shaft Sinking ◽  
Coal Reserves

At present time,Mozambiqueis called the “Rising Star of South Africa” mainly due to the rapid development of its mining industry. Mineral resources sector ofMozambiqueis one of the most dynamically developing sectors of the country’s economy.China,BrazilandIndiahave recently become the main partners forMozambique. Recently, a number of projects is being implemented in the country, for example, Auroch Minerals Manica Gold in gold production. Increasing coal production is connected with commissioning of the Moatize open pit, which is being developed by Brazilian Vale Company, as well as Benga mining company owned by Indian ICVL consortium. The analysis of the extraction of certain mineral types inMozambiquepresented in the paper demonstrates general picture of mining industry development in the country. The analysis findings allow identifying the causes of negative phenomena in the industry, manifesting themselves in decreasing production of certain types of minerals. For instance, the main reasons for the decline in coal production were dropping labor productivity, deterioration of mining conditions, and depletion of the most accessible coal reserves, extractable by open pit mining. In this regard, development of underground mining methods providing for opening of deep deposits by vertical shaft sets is highly relevant. The experience of the neighboringRepublicofSouth Africashows that, in the mining and geological conditions of the south of the African continent, highspeed shaft sinking methods accelerating deposit development can be successfully applied.

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