The drillability classification of the surrounding rock during the drilling process of coal mine gas drainage through the Mechanical Specific Energy(MSE) can provide a basis for the drilling rig to adjust the drilling parameters. Aiming at the problems of difficulty and low efficiency of manual layer identification in the process of gas drainage and drilling, a coal …
— Therefore, in this study, a classification method for coal mine gas explosion accident causes based on the sixth edition 24Model and the three-element classification of gas explosions was proposed.
— Several rock mass classification systems developed for the assessment of rock slope stability were evaluated with the condition of rock slopes in the tropics, especially Indonesian region, particularly in sedimentary rocks in the open pit coal mining area in order to get the corrected GSI equation used to characterize rock slopes based on rock ...
— Roadheaders are commonly used in coal mines for roadway excavations. The prediction of roadheader performance is necessary for the planning of roadway projects and the estimation of costs. Recently, a new rock mass cuttability classification (RMCC) system has been introduced for roadheaders used in coal mines. In this study, the …
The first section gives an overview of underground mining methods and practices as used commonly in underground mines, including classification of underground mining …
— The traditional methods of risk classification are time consuming and laborious if the inputs are voluminous. In this study, the hazards occurring in different sections of underground mining have been categorized, and associated risks have been predicted using different machine learning modelling techniques, namely KNN, SVM, logistic …
— The methods of mining of coal varies from deposit to deposit. This report highlights the coal mining methods, their significances, issues of concern and the stages of using coal...
— Labor safety at workplaces is a critical human rights concern in all industries around the world. Coal mines are considered one of the most dangerous workplaces and every year thousands of miners around the world die or get severe injuries in mining accidents. To make efficient technology-based accident mitigation plans for such work …
— Coal quality is a function of coal petrology, element organic and mineral associations, and coal rank • Understanding of coal quality is vital to utilization, research, …
— Surface mining; Classification of surface mining methods together with the desired parameters/ conditions suitable for their applications; Open pit mining; Classification of quarrying methods ...
— Remote sensing data are widely used to identify of surface subsidence area due to the advantages of temporal and spatial continuity and wide coverage (Cai et al., 2023; Lin, 2022).The more commonly used methods for subsidence zone identification are the machine learning classification method based on remote sensing imagery and …
— Bord and pillar method of mining continues to be a major operation in India with about 160 mines producing 35 MT of coal. Owing to the exhaustion of near-surface deposits, environmental impacts and land acquisition issues associated with surface mining, underground coal mining is expected to take a leap in the next decade. Weak and …
— Using fuzzy clustering and empirical evaluation method, the classification model of surrounding rock stability of coal roadway is proposed, which is applied to 37 coal roadways of Zibo Mining ...
— First, text mining technology is used to mine the text features of coal mine accident reports and reduce the initial text features' dimensionality based on the chi-square statistical method. On this basis, the leading causes of accidents are extracted, and the levels of the causes are classified according to the risk management model in the ...
Classification of underground mining methods: Soft Rock Mining Methods. The method of extracting coal, oil shale, potash, and other minerals from soft or sedimentary rocks. ... An older practice of coal mining that uses explosives such as dynamite to break up the coal seam, ... A coal mining method that accounts for less than 1% of deep coal ...
Coal Mining Methods (cont.) Underground mining methods: room and pillar mining – coal is extracted by driving a series of entries (rooms) that are connected periodically by perpendicular entries (cross-cuts). The blocks of coal that remain between the entries …
— Introduction. Coal 1 serves as a fundamental source of energy and a crucial industrial raw material essential for the advancement of human civilization. Within the realm of mining engineering, ensuring the safe extraction of coal stands as a paramount objective. Moreover, proactive measures 2, 3 in early detection and scientific prevention of …
— Methods by which coal can be studied and classified are described, including coal petrography, vitrinite reflection measurement, and chemical and physical characterization methods (ultimate and ...
— The method used gives some indication of the amount and pattern of coal extraction within each mined area, and has some influence on the timing and type of subsidence that can occur over a mine. The following discussion and illustrations of mining methods are based on Guither et al. (1984). Room and pillar
Most underground coal is mined by the room and pillar method, where by rooms are cut into the coal bed leaving a series of pillars, or columns of coal, to help support the mine roof and control the flow of air.Generally, rooms are 2,000 feet wide and the pillars up to 300 feet wide. At least 60 feet of coal was left between an underground mine and the surface, if …
— 4. In Wales there is archaeological evidence of using coal in funeral pyres in bronze age, some 3000-4000 yrs ago. Coal was mined in colonial America in the early 1700s and commercial mining first occurred around 1730 in Midlothian, ia. Coal cutting machine were invented in the 1880s. Before the invention, coal was mined from …
— DOI: 10.1007/s11053-024-10370-0 Corpus ID: 270569382; Characteristics and Evolution of Water-Occurrence in Coal Based on a New Classification Method @article{Liu2024CharacteristicsAE, title={Characteristics and Evolution of Water-Occurrence in Coal Based on a New Classification Method}, author={Ding Liu and Hao …
— The classification of coal bursting liability (CBL) is essential for the mitigation and management of coal bursts in mining operations. This study establishes an index system for CBL ...
— 3. 3 Minerals are the major sources of energy as well as raw materials for industries. earth's natural materials are used as fertilizers and for the production of metals like steel. These were used to make early tools and weapons. This report provides the details of the widely adopted methods of mining, both surface and underground and to …
Although the coal industry of Mexico is relatively small with 15 million tonnes of coal mined per year, the coal mines of northern Mexico are notoriously gassy and these three mines …
— Combined with the fuzzy clustering, the author proposes a SIM-based classification method for surrounding rock stability of coal roadway: SIM, i.e., the strength of surrounding rock, in situ stress, and mining indexes. This method uses site monitoring or laboratory tests to determine the values of evaluation indexes, and the weights of each ...
— Thus, this study aims to determine if the machine learning based classification and spatial methods can be applied with similar success in alternative coal deposits. In this paper, we use the same methods that were used by Maxwell et al. (2019, 2021b), but in a complex, thinly bedded coal deposit in the Moatize Basin in Mozambique that is ...
— Several attempts have been made over the latter half of the twentieth century to devise a system for the classification of underground mining methods. None of these are found to be totally successful. A revised classification is suggested with three main categories being identified by reference to fill requirements, steep stopes and stratified …
Most of the bord and pillar method of coal mining has been done in depth range less than 300 m as at greater depths pillars experience crush. However, in India in some cases the depth of mining by bord and pillar method has been around 600 m, though mining at such depths is beset with the problems of strata control.
— Heerlen was the central town of Dutch coal mining, where also the headquarters of Dutch State Mines (DSM) Footnote 8 were (and still are) located. This classification system, which is still in use, is referred to as the Stopes-Heerlen Classification of Macerals. By convention, maceral names always have an "-inite" suffix.
— 1. A worldwide problem: transition of "Mine-City system" The transition of "Mine-City system" has been a worldwide problem. According to the data of the American mining association, there are about 80 thousand to 250 thousand abandoned mines in the United States. 1 In Ruhr, which has 100 years of coal mining history, the number of coal …
— Coal burst is a catastrophic event that induced by a large variety of certainty and uncertainty factors, and many methods have been proposed to evaluate the risk of this hazard. Conventional evaluation models or empirical criteria are influenced by the complex modelling process or undesirable accuracy. In this study, a total of 147 groups of coal …
— Classification system. What classification system does the mining industry use for reporting mineral resources and mineral reserves? Mexico follows international …
— Introduction. Field-validated geomechanical computational modelling of longwall coal mine excavations has been applied to roadway support design [1], [2] mining stress interactions analysis, coal pillar design [3], analysis of the effect of geological features such as faults, the affect of earthquakes on mine stability [4], [5], in methane …
— Surface mining is the predominant method used to extract coal in South Africa. It involves removing the overlying soil and rock to access the coal seams. There are two main types of surface mining techniques employed: ... The two main underground mining methods used in South Africa are: 4.2.1. Room and Pillar Mining.
There are two types of room and pillar mining–conventional mining and continuous mining. Conventional mining is the oldest method and accounts for only about 12% of underground coal output. In conventional mining, …
