Article
Geology
Baoyi Zhang, Kun Xu, Umair Khan, Xuefeng Li, Linze Du, Zhanghao Xu
Summary: In this study, a lightweight three-dimensional convolutional neural network method is proposed for concealed ore deposit exploration. It can effectively extract crosscorrelations among geological factors and generate fewer parameters in the face of massive data. Compared to previous studies, this method overcomes some drawbacks and shows better prediction effectiveness and efficiency.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Zhan-Ke Li, Chang Wang, Zhen-Qiang Wang, Kai -Wen Li, Jun-Jie Zhou, Xiao-Ming Li, Jia Hu, Jun Zhang
Summary: The Nannihu ore field in the southern North China Craton is home to a variety of valuable mineral resources, including Mo, W, Zn, Pb, Cu, and Ag. Through a comprehensive geological, geochronological, and pyrite geochemical study, researchers have uncovered the relationships between different types of deposits in the area. The findings reveal a giant magmatic-hydrothermal metallogenic system, with zonation of porphyry, skarn, and epithermal mineralization. The multi-episode magmatism and mineralization have led to the significant enrichment of mineral resources in the Nannihu ore field.
ORE GEOLOGY REVIEWS
(2023)
Article
Energy & Fuels
Fulin Cai, Sheng Xue, Mei Zhang, Jing Zhang, Xiufeng Chen, Yi Bao, Yaqiang Li
Summary: In China, coal miners face significant psychological challenges due to occupational stress and high risk of occupational diseases. This study demonstrates that the Chinese version of the Crown-Crisp Experience Index (CCEI) questionnaire is highly reliable and valid, and can be used as a screening tool to assess the psychological state of coal miners.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Geology
Xuan Wang, Jingwen Mao, Changqing Zhang, Da Zhang, Xinming Zhang, Yongfei Tian, Wei Jian, Mingjian Yang, Songyan Liu, Wenjie Li, Wensheng Shi, Zhenxu Liu
Summary: The Xiayu Ag-Pb-Zn-Au deposit in the southern North China Craton has been studied to understand the connection between extensional faults and vein-hosted mineralization. New structural data and fault-slip data analysis were used to determine that the region experienced two discrete stress fields, leading to the formation of fault-fill veins (stage I) and extensional veins (stage II). These veins are believed to have formed during regional extension in different directions.
ORE GEOLOGY REVIEWS
(2023)
Article
Energy & Fuels
Jiuzhu Wang, Cuifeng Du, Yuan Wang, Zheng Chen
Summary: The microstructure and adhesion force of dust particles on the soil pavement of an open-pit mine were examined using scanning electron microscopy, the BET method, and the abruption technique. The results show that the dust shape is mainly irregular quadrilateral, pentagonal and circular. The adhesion force of dust particles decreases as particle size and temperature increase, and increases with environmental humidity and pressure.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Geology
Xiang-Ying Ye, Bin Li, Xiao-Dong Chen, Jing Lei, An-Huai Lu, Lei Zhao, Xing Li, Dong-Bo Tana, Yilin Xiao
Summary: This study investigates the geochemistry and Li isotopes of the Renli-Chuanziyuan lithium-niobium-tantalum deposit in China's Mufushan batholith, finding that magmatic volatile phase (MVP) exsolution is related to pegmatite formation and MVP migration plays a role in the different Li isotopic compositions of pegmatites. The results suggest that MVP exsolution, migration, and accumulation are key factors in rare metal mineralization.
ORE GEOLOGY REVIEWS
(2023)
Correction
Energy & Fuels
Grzegorz Lesniak, Daniel J. J. Brunner, Tomasz Topor, Malgorzata Slota-Valim, Renata Cicha-Szot, Bartlomiej Jura, Jacek Skiba, Arnold Przystolik, Ben Lyddall, Grzegorz Plonka
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Pengfei Ji, Haifei Lin, Xiangguo Kong, Shugang Li, Biao Hu, Pei Wang, Di He, Songrui Yang
Summary: The pore structure of coal is crucial for the storage and migration of CH4/N-2, as well as for the effectiveness of N-2 injection. This study analyzed the pore structure characteristics of low-permeability coal and investigated its deformation during CH4/N-2 adsorption-desorption. The results show that N-2 injection has the potential to improve coal seam permeability and enhance gas flow.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Shidong Wang, Jianhua Guo, Yang Yu, Pujie Shi, Hebing Zhang
Summary: There are several deficiencies in the current evaluation of land reclamation quality in mining areas, including the absence of established evaluation index systems and standard acceptance criteria, as well as the use of costly and inefficient traditional sampling techniques. Compared with traditional sampling survey methods, remote sensing has advantages such as wide detection range, diverse information collection, multiple data-acquiring strategies, high speed, and short cycle. In this study, remote sensing techniques were used to extract information and evaluate land reclamation quality in the Xinzhuang coal mining field in Yongcheng, Henan Province.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Chunguang Wang, Hongxu Wang, Derek Elsworth, Guanglei Cui, Bingqian Li, Meng Zhou, Wenxin Li, Jiyuan Zhang
Summary: Accurately identifying changes in coal permeability and effective stresses is crucial for predicting gas flow in coal reservoirs. Traditional methods underestimate permeability and effective stress, but corrected values are more accurate.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Parviz Enany, Oleksandr Shevchenko, Carsten Drebenshtedt
Summary: One of the key factors in reducing air consumption in particle conveying with an airlift pump is the understanding of the factors that affect particle motion at zero initial velocity. By studying the airlift pump and using spherical glass and irregular coal as experimental particles, the influence of submergence ratio and particle physical properties (such as size, shape, and mass) on the onset of vertical particle motion was determined. The results show that the start of particle motion in the water-air mixture is not always at a certain value of superficial water velocity, and this value increases with increasing submergence level. Among the parameters considered, the submergence ratio has a more significant effect compared to particle dimensions and shape, as increasing the submergence from 0.3 to 0.8 can reduce air consumption up to 8 times. This study optimized the theoretical model proposed by Fujimoto et al., and the modified theory showed good agreement with the experimental data. Contrary to Fujimoto, the minimum superficial water velocity for lifting solids in the air-water mixture is not always smaller than water ambient, indicating an optimum submergence ratio higher than 0.7. Finally, a new criterion was introduced to describe the onset of particle motion as a function of the superficial fluid velocity ratio for each submergence value.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Xuewei Liu, Haixiao Chen, Bin Liu, Sai Wang, Quansheng Liu, Yong Luo, Jin Luo
Summary: Water injection is a widely used technique to prevent coal burst. This study investigated the effects of water content on the failure mode, fragment size, and energy characteristics of coal specimens through laboratory tests. It was found that strength, energy characteristics, and brittleness index decrease with increasing water content, while the failure mode transitions gradually and the average fragment size increases. Numerical modeling also showed that water injection can reduce coal burst and ejection velocity, but increase crack depth and surface displacement of the roadway.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Daixin Deng, Hongwei Wang, Lili Xie, Zeliang Wang, Jiaqi Song
Summary: A physical simulation model was constructed to study the dynamic disaster mechanism induced by overburden rock caving in a coal mining face. The study found that the overburden rock caving exhibited uneven strength despite the uniform interval. There was a reasonable relationship between mining-induced stress and displacement, temperature, and acoustic emission events. The collaborative characteristics of mining-induced stress, displacement, temperature, and acoustic emission ringing counts can be identified as the precursor information of overburden rock caving.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Lei Sun, Mei Li, Aly Abdelaziz, Xuhai Tang, Quansheng Liu, Giovanni Grasselli
Summary: This paper proposes a simple and efficient numerical framework for simulating fluid flow in fractured porous media using high-resolution images. Through validation and simulations on real samples, the results show that the model achieves a good balance between computational efficiency and accuracy.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Sureka Thiruchittampalam, Sarvesh Kumar Singh, Bikram Pratap Banerjee, Nancy F. Glenn, Simit Raval
Summary: This study explores a novel approach to characterise coal mine spoil using unmanned aerial vehicle (UAV) based optical remote sensing. The proposed workflow utilises the textural and spectral properties of high-resolution UAV images to derive the lithology and geotechnical parameters of the spoil materials. Machine learning algorithms are employed to characterise the spoil rapidly and accurately.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Yuting Men, Zhen Song, Ying Sun, Kaili Li, Xianlin Qing, Hongen Sun, Meng Zhou
Summary: This paper proposes two new integrated tools for breaking and collecting natural gas hydrate, and verifies their technological feasibility through finite element analysis, three-dimensional modeling, and simulations. The results show that these tools can effectively improve the efficiency of hydrate exploitation and ensure reservoir stability, providing a reference for further research on the solid-state fluidization exploitation technology of marine gas hydrates.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Geology
Yan Dao, Jia-Xi Zhou, Xiao-Hu Wang, Ya-Hui Zhang, Guo-Tao Sun, Zheng-Peng Yue, Ye He
Summary: This study investigates the enrichment of selenium in the Dingtoushan Se-rich Pb-Zn deposit and finds that selenium enrichment in sphalerite is jointly controlled by fluid mixing and temperature.
ORE GEOLOGY REVIEWS
(2023)
Article
Energy & Fuels
Jiangjiang Yin, Jiangyang Lei, Kaixin Fan, Shaofeng Wang
Summary: A comprehensive evaluation method is proposed to analyze dust pollution in mines using an optimized image-processing and deep learning framework. The method includes the development of an integrated hazardous index and a four-category dataset. The deep learning model established for dust risk classification achieves a high degree of accuracy and reliability.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Yang Zhao, Xin He, Lishuai Jiang, Zongke Wang, Jianguo Ning, Atsushi Sainoki
Summary: This study used CT scanning to extract the internal crack networks of coal specimens and statistically analyzed the relationship between crack geometric parameters and rock mechanics properties. The results showed that crack parameters were correlated with the uniaxial compressive strength and elasticity modulus of the specimens, and the internal crack structures of the specimens had an impact on their mechanical properties. For complex rock mass structures, it is recommended to analyze at least 16 cracks or geometric parameters with an area larger than 5mm².
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Xiyang Fang, Bo Tan, Haiyan Wang
Summary: This study tested the effectiveness of N(2) and CO2 in preventing coal from spontaneously combusting and found that helium (He) had the best cooling effect, followed by N-2, and CO2 was the least effective. Additionally, the study discovered that N-2 injection was more effective than CO2 injection in cooling coal samples and replacing oxygen. These findings are important for the application of inert flame retardant technology in the goaf.
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2023)
