Study On Ratio Of Cutting Height To Caving Height For Efficient Top-Coal Recovery In Extra Thick And Gently Inclined Coal Seam – A Case Study Of Seam 7 Ha Lam Coal Mine, Vietnam,
2025
Faculty of Mining, Hanoi University of Mining and Geology, Vietnam,
Study On Ratio Of Cutting Height To Caving Height For Efficient Top-Coal Recovery In Extra Thick And Gently Inclined Coal Seam – A Case Study Of Seam 7 Ha Lam Coal Mine, Vietnam, Duc Hung Pham, Tien Dung Le, Phi Hung Nguyen, Van Quan Pham
Journal of Sustainable Mining
The mechanized longwall top-coal caving technology (LTCC) has been used in Quang Ninh underground coal mines owned by Vietnam National Coal – Mineral Industries Holding Corporation Limited (Vinacomin). The application of the LTCC technology has achieved significant achievements, contributing to the production of coal for national economy development. The use of LTCC has shown that the top-coal recovery efficiency is directly affected by the sequence of top coal drawing, ratio of cutting height to caving height, and caving span. These parameters, especially for extracting thick and gently inclined coal seam conditions as in the Quang Ninh coal field, have not …
Native Organizations Fill Gaps In Federal Support For Tribal Renewable Energy, Healing Native Communities,
2025
College of Saint Benedict/Saint John's University
Native Organizations Fill Gaps In Federal Support For Tribal Renewable Energy, Healing Native Communities, Corrie Grosse, Dawn D. Davis, Robert Blake, Chéri Smith
Environmental Studies Faculty Publications
No abstract provided.
A Bayesian Network For Business Uncertainties In Coal Mining Industry,
2025
Interdisciplinary School of Management and Technology, Institut Teknologi Sepuluh Nopember, Indonesia
A Bayesian Network For Business Uncertainties In Coal Mining Industry, Firman Risqul Fidry, Iwan Vanany, Jerry Dwi Trijoyo Purnomo
Journal of Sustainable Mining
In recent years, business uncertainty in the coal mining industry has increased along with increasing global energy demand and carbon emission reduction policies. Not much research has been done on business uncertainty in the coal mining industry based on modelling. This study aimed to develop a model for business uncertainty in the coal mining industry using a Bayesian network approach. The Indonesian coal mining industry was utilized as a case study to develop the proposed model. Two dimensions and nine factors were identified and structured based on a literature review and rigorous interviews with three interviewees from three companies. Each …
Eco-Efficiency And Life Cycle Assessment Of The Long Reach Directionally Drilled And Cross-Measure Boreholes Methane Drainage Technologies Employed In Bituminous Coal Mine On The Basis Of The Pilot Scale Experimental Data,
2025
Central Mining Institute – National Research Institute, Department of Mining Aerology, Poland,
Eco-Efficiency And Life Cycle Assessment Of The Long Reach Directionally Drilled And Cross-Measure Boreholes Methane Drainage Technologies Employed In Bituminous Coal Mine On The Basis Of The Pilot Scale Experimental Data, Bartłomiej Jura, Piotr Krawczyk, Anna Śliwińska, Jacek Skiba, Marcin Karbownik, Natalia Howaniec
Journal of Sustainable Mining
This paper presents the results of eco-efficiency and life cycle analysis conducted for two methane drainage technologies: cross-measure (CM) and long reach directionally drilled (LRDD) boreholes. In the analyses, data from coal mine methane drainage of two coal panels, I-C and II-C, located at the Staszic-Wujek coal mine in Poland, were used. The results of the life cycle and eco-efficiency assessments showed that employment of long reach directional drilling boreholes method has a lower environmental impact and is more eco-efficient, causing the lower environmental impact and lower construction and operating costs per cubic meter of methane extracted. The results of …
Acknowledgement Of Reviewers,
2025
Central Mining Institute
Coal Mining-Induced Composite Damage To Geological Bodies And Geological Guarantee Against Damage Reduction,
2025
Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an University of Science and Technology, Xi’an 710054, China; Geological Research Institute for Coal Green Mining, Xi’an University of Science and Technology, Xi’an 710054, China; College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
Coal Mining-Induced Composite Damage To Geological Bodies And Geological Guarantee Against Damage Reduction, Wang Shuangming, Sun Qiang, Hu Xin, Geng Jishi, Hou Enke, Wang Shengquan, Zhou Shutao, Shi Qingmin, Yuan Shihao, Chen Kai, Song Shijie
Coal Geology & Exploration
Objective and Background Coals have long served as a predominant energy source in China. With an increase in mining scale and intensity in recent years, the correlations between rocks, soils, hydrosphere, and ecological environment in coal mining areas have been strengthened. Given this, there is an urgent need to, from the perspective of Earth system science, understand the coupling relationships and chain characteristics among factors including the movement and deformations of surrounding rocks, rock bursts, coal and gas outbursts, water inrushes, ground subsidence, water and soil erosion, and damage to ecological environments, aiming to achieve safe, green coal mining. Methods …
Fracture-Seepage Characteristic Zones Of The Overburden Of Extra-Thick Coal Seams: Evolutionary Patterns And Their Engineering Applications,
2025
College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; Key Laboratory of Western Mine Exploitation and Hazard Prevention, Ministry of Education, Xi’an University of Science and Technology, Xi’an 710054, China
Fracture-Seepage Characteristic Zones Of The Overburden Of Extra-Thick Coal Seams: Evolutionary Patterns And Their Engineering Applications, Kong Xiangguo, Zhao Tianshuo, Lin Haifei, Zhao Pengxiang, Wang Xu, Cai Yuchu, Ji Pengfei, He Di, Li Ke, Xu Chuanyu
Coal Geology & Exploration
Objective and Methods Given that the overburden’s structure significantly influences pressure relief gas extraction, this study aims to explore the gas migration patterns of the overburden of thick coal seams during coal seam mining. To this end, this study analyzed the evolutionary patterns of the fracture morphology and seepage capacity of the overburden using physical similarity simulation experiments. Accordingly, this study investigated the mechanisms behind the evolution of fracture-seepage characteristic zones of the overburden of extra-thick coal seams and proposed a method for identifying fracture-seepage characteristic zones of the overburden. Using this method, this study conducted gas extraction along the …
Experimental Study Of The Piezoelectricity Of Middle Pleistocene Loess In The Weibei Region, China,
2025
School of Intelligent Science and Engineering, Xi’an Peihua University, Xi’an 710125, China; School of Civil Engineering, Chang’an University, Xi’an 710061, China
Experimental Study Of The Piezoelectricity Of Middle Pleistocene Loess In The Weibei Region, China, Jing Yanlin, Liu Jie, Liu Qingying, Duan Xiaoxiao, Xie Na, Yang Dengke
Coal Geology & Exploration
Objective Quartz, the piezoelectric material discovered the earliest, has found widespread applications in industry, military fields, and daily life due to its piezoelectricity. The widely distributed loess worldwide is composed primarily of quartz, accounting for 37.0% to 69.9%. However, there is a lack of studies on the piezoelectricity of loess both domestically and internationally. Methods This study investigated the ${\mathrm{Q}}_2^{{\mathrm{eol}}} $ loess from the Weibei Loess Tableland in Shaanxi Province as an example to explore the piezoelectricity of loess. The piezoelectric coefficient of the loess was measured, and its piezoelectric voltage under the action of static loading and vibration was …
Deformations And Seepage-Induced Erosion Of Fractured Rocks In Fault Under Confined Settings,
2025
Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi’an 710077, China; College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Deformations And Seepage-Induced Erosion Of Fractured Rocks In Fault Under Confined Settings, Sun Wenbin, Tian Dianjin, Ma Cheng, Xue Yanchao, Yang Can, Zhu Kaipeng
Coal Geology & Exploration
Objective Most of the mining areas in China have entered the deep mining stage. In this case, the risks of mine water inrushes increase significantly due to the complex deep hydrogeological conditions, a significant increase in the number of hidden disaster-causing factors, and the existence of faults. Methods Using a deformation-seepage experiment system for fractured rocks, this study investigated the characteristics of compressive deformations and seepage-induced erosion of fractured rocks in faults. By analyzing the impacts of particle-size distribution combinations, saturation state, and seepage pressure, on the deformation-permeability characteristics of fractured rocks under confined axial compression, this study investigated the …
An Intelligent Lithology Identification Method For Sandstone And Mudstone Strata And Its Applications: A Case Study Of The Jurassic Strata In The Lunnan Area, Xinjiang, China,
2025
Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China; College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430100, China
An Intelligent Lithology Identification Method For Sandstone And Mudstone Strata And Its Applications: A Case Study Of The Jurassic Strata In The Lunnan Area, Xinjiang, China, Cai Ming, Zhou Qingwen, Yang Cong, Chen Feng, Wu Dong, Lin Wang, Zhang Chengguang, Zhang Yuanjun, Miao Yuxin
Coal Geology & Exploration
Objective Lithology identification lays the foundation for fine-scale reservoir evaluation. However, traditional identification methods generally utilize the interactive relationships between only 2‒3 logging parameters, suffering from low utilization rates of logging information and low identification accuracy for strata with small differences in logging responses. This seriously restricts the effects of old well reexamination. The efficient, intelligent CatBoost classification algorithm can fully mine the correlations between multi-source logging information and lithology. Methods This study investigated the Jurassic sandstone and mudstone reservoirs in the Lunnan area, Xinjiang, China. Using five logging parameters determined through sensitivity analysis, i.e., natural gamma-ray value, spontaneous potential, …
A Dehazing And Enhancement Algorithm For Heterogeneous Images Of Underground Mining Environments In Coal Mines,
2025
College of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; Shaanxi Key Laboratory of Mine Electromechanical Equipment Intelligent Monitoring, Xi’an 710054, China
A Dehazing And Enhancement Algorithm For Heterogeneous Images Of Underground Mining Environments In Coal Mines, Zhang Xuhui, Xie Yanbin, Yang Wenjuan, Zhang Chao, Wan Jicheng, Dong Zheng, Wang Yanqun, Jiang Jie, Li Long
Coal Geology & Exploration
Objective In coal mines, the uneven distribution of dust haze and complex illumination conditions caused by underground coal mining and dust removal lead to blurred video images, as well as the loss of information and details. Hence, this study proposed a dehazing and enhancement algorithm for heterogeneous images of underground mining environments. Methods Initially, hazy images were segmented into zones with different brightness values, for which the average ambient light intensity of global dark channels was calculated. The calculation results were integrated through weighting with the ambient light of local bright channels, which was obtained using adaptive gamma correction and …
An Analytical Method For The Desorption Superposition Effect In Commingled Production Of Coalbed Methane And Its Application: A Case Study Of The Xiaotun Mine Field In Western Guizhou Province, China,
2025
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China; Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an 710054, China; Geological Research Institute for Coal Green Mining, Xi’an University of Science and Technology, Xi’an 710054, China
An Analytical Method For The Desorption Superposition Effect In Commingled Production Of Coalbed Methane And Its Application: A Case Study Of The Xiaotun Mine Field In Western Guizhou Province, China, Guo Chen, Ji Yan, Zhao Chenyi, Lu Lingling, Yu Xinhang, Gao Junzhe, Li Houqiang, Zhang Xuyang, Wang Xiang, He Hongbin, Zhang Runhan
Coal Geology & Exploration
Objective The commingled production of coalbed methane (CBM) serves as a significant means to increase single-well production. However, production practices reveal that the commingled production of CBM exhibits complex and varied effects and controlling factors, facing technical challenges of identifying gas-producing contributions, predicting gas-producing potential, and optimizing pay interval combinations. The superposition of desorption for gas production among different coal seams determines whether high CBM production can be achieved using commingled production. Methods This study proposed an analytical method for the desorption superposition effect in the commingled production of CBM, involving determining desorption sequences, analyzing the superposition of desorption intervals …
Optical-Electrical-Acoustic Wave Multiparameter Response Characteristics Of Typical Rocks In Coal-Bearing Strata Throughout The Loading Process,
2025
State Key Laboratory for Safe Mining of Deep Coal Resources and Environment Protection, Anhui University of Science & Technology, Huainan 232001, China; School of Earth and Environment, Anhui University of Science & Technology, Huainan 232001, China
Optical-Electrical-Acoustic Wave Multiparameter Response Characteristics Of Typical Rocks In Coal-Bearing Strata Throughout The Loading Process, Zhang Pingsong, Liu Chang
Coal Geology & Exploration
Objective The deformations and rupture of rocks under loading will cause potential changes in parameters. Dynamic parameter capture assists in characterizing the generation, propagation, and closure processes of fractures, serving as a significant method for assessing rock quality. Methods Using a multiparameter test system, this study synchronously acquired strain measured using distributed optic fibers, electrode current, and compressional wave (P-wave) velocities of rock specimens under uniaxial loading. Accordingly, this study determined strength vs. parameter characteristic relationship graphs and parametric tomography results, finely describing the multiparameter spatiotemporal evolutionary characteristics of three typical rocks (i.e., sandstone, limestone, and mudstone) throughout the loading …
A U-Net-Based Denoising Method For Semi-Airborne Transient Electromagnetic Data And Its Application,
2025
Institute of Geotechnical and Underground Engineering, Shandong University, Jinan 250061, China; Guangxi Communications Investment Group CO., Ltd., Nanning 530022, China; Guangxi Longma Expressway Co., Ltd., Nanning 530022, China
A U-Net-Based Denoising Method For Semi-Airborne Transient Electromagnetic Data And Its Application, Liu Dong, Feng Hao, Wang Yongxin, Zhou Xiaosheng, Yao Yuhong, Sun Huaifeng
Coal Geology & Exploration
Objective and Methods The semi-airborne transient electromagnetic (SATEM) method, an efficient geophysical exploration technique, has been extensively applied to mineral resource exploration, groundwater surveys, and geothermal resource surveys. However, the collected data are frequently susceptible to noise interference, significantly affecting the accuracy of subsequent data processing and interpretation. To address issues such as residual noise and the loss of effective signals, enhance denoising effects, and reduce the influence of subjective factors, this study proposed a denoising method for SATEM data based on the U-Net deep learning architecture (also referred to as the U-Net-based method) by applying U-Net to SATEM data …
China’S Cbm Exploration And Production And Associated Technological Advancements: A Review And Reflections,
2025
China National Offshore Oil Co., Ltd., Beijing 100010, China
China’S Cbm Exploration And Production And Associated Technological Advancements: A Review And Reflections, Ye Jianping
Coal Geology & Exploration
Objective and Methods Based on extensive scientific and technical literature and technical data on coalbed methane (CBM) exploration and production projects, this study conducted a comparative analysis of the development process and latest advances in China’s critical technologies for CBM exploration and production and reviewed the CBM exploration and production history of this country over the past three decades. Accordingly, this study discussed the theoretical and technical challenges in CBM exploration and production and proposed future development directions. Advances The results indicate that the insights into conversion between adsorbed and free deep CBM prove to be a significant theoretical understanding. …
Critical Technologies And Geology-Engineering Integration Practices For Deep Cbm Production In The Yanchuannan Cbm Field,
2025
East China Oil and Gas Company, SINOPEC, Nanjing 210019, China; Linfen Coalbed Methane Company, SINOPEC, Linfen 041000, China; Key Laboratory of Deep Coalbed and Methane Exploration and Development, SINOPEC, Nanjing 210019, China
Critical Technologies And Geology-Engineering Integration Practices For Deep Cbm Production In The Yanchuannan Cbm Field, Chen Zhenlong, Wang Yunhai, Liu Xiao, Cui Bin, Yang Song, Li Xin, Fang Qilong
Coal Geology & Exploration
Objective and Methods This study introduces the adjustments for coalbed methane (CBM) production in the Yanchuannan CBM field‒the first deep CBM field in China. Deep CBM production in this CBM field faces challenges including strong heterogeneity of reservoirs, single arrangement mode of production well patterns, low applicability of conventional hydraulic fracturing, excessively long conventional production cycles, and a high proportion of inefficient wells. To address these challenges, a production capacity construction model for efficient deep CBM production of the field was developed through in-depth geology-engineering integration. Results and Conclusions The results indicate that the production capacity construction process of the …
Connotation, Research Status, And Development Directions Of Clean Coal Geology In China,
2025
State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, College of Geoscience and Surveying Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
Connotation, Research Status, And Development Directions Of Clean Coal Geology In China, Tang Yuegang, Wang Shaoqing, Wang Xiaoshuai, Guo Xin, Wang Yafeng, Xue Liping, Harold H. Schobert
Coal Geology & Exploration
Objective The exploration and assessment of low-carbon, zero-emission, and maximized utilization of coal resources, emerge as a focus of coal geology in the 21st century. [Research Advances] Based on the research content of coals and coal geology, along with the domestic and international development trends of clean coal technology (CCT), this study defines clean coal geology in the broad and narrow sense. Clean coal geology in the narrow sense focuses on the geological and geochemical issues related to efficiency enhancement and emission reduction in coal processing and utilization. In contrast, clean coal geology in the broad sense emphasizes …
Table Of Contents,
2025
China Coal Technology and Engineering Group (CCTEG)
A Deep Learning-Based Method For The Intelligent Identification Of The Quantity Of Coals Flushed Out During Borehole Hydraulic Flushing,
2025
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China; Henan International Joint Laboratory of Coalmine Ground Control, Jiaozuo 454003, China
A Deep Learning-Based Method For The Intelligent Identification Of The Quantity Of Coals Flushed Out During Borehole Hydraulic Flushing, Li Xiaojun, Zhao Mingyang, Li Miao
Coal Geology & Exploration
Objective Given the inaccurate and low-efficiency manual statistics of the quantity of coals flushed out during borehole hydraulic flushing, this study proposed an intelligent identification method that combines YOLOv8n, ResNet34, and PP-OCRv4 algorithms. Methods First, the first-level detection was completed using the YOLOv8n algorithm, which, combined with the ResNet34 and PP-OCRv4 algorithms via parallel cascade, was then employed to conduct second-level processing. Through the above processing and in combination with the method for classification status discrimination based on tracking frame numbers, the framework of an algorithm for automatically calculating the quantity of coals flushed out was established. Subsequently, the deformable …
Advances And Trends Of Modern And Contemporary Research On The Geology Of Coal-Measure Minerals In China,
2025
China University of Mining and Technology, Xuzhou 221008, China
Advances And Trends Of Modern And Contemporary Research On The Geology Of Coal-Measure Minerals In China, Qin Yong
Coal Geology & Exploration
Background Coal-measure minerals (CMMs) play a significant role in ensuring the safe supply of mineral resources in China. Reviewing the advances and trends of research on the geology of CMMs in China holds great historical significance and practical value while potentially providing some insights into subsequent research. Advances Based on textual research and the analysis of logical relations, this study generalized the advances in research on the geology of CMMs in China into four aspects. (1) Increasingly improved geological theory system of CMMs: China’s classic theoretical system of coal field geology was formed in the second half of the 20th …
