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46 results for “Coal mining”
Figure 3 in Diversity of ground-dwelling arthropods on overburden dumps after coal mining
Figure 3. The ratio of ground-dwelling arthropods taxa in the study site.
Figure 2C-D in Diversity of ground-dwelling arthropods on overburden dumps after coal mining
Figure 2C-D. Study sites: (C) Kedr3, (D) Kedr4.
Inventory of coal mining caused landslides and fissures in the center Chinese Loess Plateau
<p>A new inventory of coal mining caused landslides and fissures in the center of the Chinese Loess Plateau was generated based on four high-resolution DOMs conducted by UAV surveys and field investigations from 2020 to 2023. The field named "area" in the attribute tables of shapefiles named "2020_Landslides", "2021_Landslides", "2022_Landslides", and "2023_Landslides" indicates the area of the landslides (square meter) , and the "Time" indicates the occurred year of landslides. The field named "Length" in the attribute tables of shapefiles named "2020_Fissures", "2021_Fissures", "2022_Fissures", and "2023_Fissures" indicates the length of the fissures (meter), and the "Time" indicates the occurred year of fissures. The inventory of landslides and fissures in 2020 published by Yang et al., (2022) was referenced when we conducted visual interpretation.</p>
Characterization of metal-removing Mn oxides at a coal mine drainage treatment site in Glasgow, PA
<p>Dataset for: Characterization of metal-removing Mn oxides at a coal mine drainage treatment site in Glasgow, PA</p> <p>Includes the following: XRD, XAFS, FTIR, Raman, ICP-OES, EDS</p>
Study on the improvement of grouting stone properties in coal mine goafs using combined denitrifying bacteria
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Hydrochory, a key ecological function of a tropical dry forest river threatened by a dam and open-pit coal mining in Colombia
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FIGURE 2. Heterolepidoderma sinus Kolicka, 2015 in From saline to salty? Heterolepidoderma sinus (Chaetonotida, Chaetonotidae) from subsaline coal mine settling ponds
FIGURE 2. Heterolepidoderma sinus Kolicka, 2015. Scales are in µm. A—Dorsal body view. B—View of internal morphology. C— Ventral body view. D—Detail of head with lateral lamellae. E—Detail of head, neck and anterior trunk ventral view with visible lamellae. F—Detail of trunk, furca base and furcal appendages ventral view with visible ventral lamellae.
The sustainable development of coal mines by new cutting roof technology
<p>China consumes more than 3.6 billion tons of coal every year, accounting for over 60% of the energy consumption. Therefore, the sustainable development of coal mine is a problem needed to be solved by the Chinese government. During the coal resources recovery, the protective coal pillars between the adjacent working faces cause the serious loss for coal resources. In order to solve the problem, it was put forward that the new technology of roof cutting with chain arm to retain roadway in the paper. Firstly, the process of retaining roadway, roof-cutting parameters and the damage ranges of roadway surrounding rock induced by roof cutting with chain arm were analyzed. Then, it was given that the working resistance of the temporary support equipment in technology of roof cutting with chain arm to retain roadway. Next, the roof-cutting height, the type of temporary support equipment, working resistance of portal support and support parameters of the bolt and anchor cables were optimized by the numerical calculation. Finally, the industrial experiment of retaining roadway by roof cutting with chain arm was carried out in a working face. The surrounding rock damage was minimal with the use of chain arm-roof cutting technology, and the variation range of the uniaxial compressive strength was only 5%, resulting in the roof damage rate to 82 mm. From the studies, it was concluded that this technology could be of a great asset to the coal mining community.</p>
Data from: Restoration as mitigation: analysis of stream mitigation for coal mining impacts in southern Appalachia
Compensatory mitigation is commonly used to replace aquatic natural resources being lost or degraded but little is known about the success of stream mitigation. This article presents a synthesis of information about 434 stream mitigation projects from 117 permits for surface mining in Appalachia. Data from annual monitoring reports indicate that the ratio of lengths of stream impacted to lengths of stream mitigation projects were < 1 for many projects, and most mitigation was implemented on perennial streams while most impacts were to ephemeral and intermittent streams. Regulatory requirements for assessing project outcome were minimal; visual assessments were the most common and 97% of the projects reported suboptimal or marginal habitat even after 5 years of monitoring. Less than a third of the projects provided biotic or chemical data; most of these were impaired with biotic indices below state standards and stream conductivity exceeding federal water quality criteria. Levels of selenium known to impair aquatic life were reported in 7 of the 11 projects that provided Se data. Overall, the data show that mitigation efforts being implemented in southern Appalachia for coal mining are not meeting the objectives of the Clean Water Act to replace lost or degraded streams ecosystems and their functions.
Fig. 1 in Pannonibacter carbonis sp. nov., isolated from coal mine water
Fig. 1. Phylogenetic tree showing the relationship of strains Q4.6T and Q2.11 with strains of closely related species within the genus Pannonibacter as inferred from 16S rRNA gene sequences. Data with gaps and ambiguous nucleotides were removed during alignment for reconstruction of the tree. The tree was generated using the NJ method in MEGA 7.0 based on a comparison of 1497 nt. Bootstrap values are expressed as percentages of 1000 replications. The GenBank/EMBL/DDBJ accession number of each sequence is shown in parentheses.
Data from: Restoration as mitigation: analysis of stream mitigation for coal mining impacts in southern Appalachia
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The sustainable development of coal mines by new cutting roof technology
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FIGURE 1. A—Study area with marked sampling sites. B in From saline to salty? Heterolepidoderma sinus (Chaetonotida, Chaetonotidae) from subsaline coal mine settling ponds
FIGURE 1. A—Study area with marked sampling sites. B—Studied coal mine settling pond.
Data from: An experimental study of the influence of lithology on compaction behaviour of broken waste rock in coal mine backfill
The research aims to explore the influences of lithology on the compaction behaviours of broken waste rocks. For this purpose, a WAW1000D servo test machine and a self-made bidirectional loading test system for granular materials were used to conduct axial and lateral compaction tests on four typical types of broken waste rocks: sandstone, mudstone, limestone, and shale. On this basis, we analysed the relationships between lateral and axial stress with the strain in, and porosity of, the four types of broken waste rocks. In addition, the relationship of axial stress with lateral stress and lateral pressure coefficient, and the changes in the particle size distribution of broken waste rocks before, and after, compaction were discussed. The test results demonstrated that the samples of higher strength were found to have low lateral and axial strains as well as a lower porosity in axial and lateral loading tests; while samples of lower strength showed low lateral stress and lateral pressure coefficient under axial load. After being compacted, the samples of the four types of broken waste rocks were found to have a higher proportion of small particles, indicating some particle crushing. Moreover, the samples of lower strength were broken to a greater extent.
Datasets for "A survey of methane point source emissions from coal mines in Shanxi province of China using AHSI on board Gaofen-5B"
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Seismic datas generated while excavation of coal mine roadway
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Data and code for 'Coal mine closure substantially increases terrestrial water storage in China'
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Microseismic activity and subsurface structure characteristic of the Laohutai coal mine in Northeast China based on a linear dense seismic array
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Figure 5 in Diversity of ground-dwelling arthropods on overburden dumps after coal mining
Figure 5. Ordination of the ground-dwelling of arthropods in the overburden dumps and control area in the plane of two discriminant axes.
Microseismic activity and subsurface structural characteristic of the Laohutai coal mine in Northeast China based on a linear dense seismic array
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