The 14 coal samples were collected from surface and underground mines developed in coal intervals of the Tertiary (Upper Paleocene-Middle Miocene) Los Cuervos, Carbonera, and Palmar Formations of the Andean Cordillera. Preliminary analytical results indicate that, on an as-received basis, the samples...
Studies of this kind have been carried out in Poland in the areas of closed hard-coal mines in the Lower Silesian Coal Basin (Sechman et al., 2013, Sechman et al., 2017) as well as in the USCB in abandoned and active hard-coal mines (Sechman et al., 2019, Sechman et al., ...
Unsupervised Detection of Active, New, and Closed Coal Mines with Reclamation Activity from Landsat 8 OLI/TIRS ImagesClay mineral ratioCoal mine indexSurface coal mineChange detectionMine classesLandsat 8Monitoring and classification of surface coal mine regions have several research aspects, as they ...
However, it is revealed that the Ce/Ce* (CeA) is increased in the coal layer and is raised to the uppermost Fe-depleted domain, but not the lowermost Fe-rich bauxite domain. This might be attributed to the Ce3+ ↔ Ce4+ and the LREE re-mobilization during the supergene/epigenetic ...
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1993 Trace elements in coal samples from active mines in the Foreland Belt, British Columbia, Canada. Int. J. Coal. Geol. 24, 259-280. (doi:10.1016/0166- 5162(93)90014-2)Grieve, D.A., and Goodarzi, F, "Trace elements in coal samples from active mines in the Foreland belt, ...
SHAPKOFF, S.; SPEARING, A.; MCDONNELL, J.; GROUNDS, D. (2006). The Development of Active Cable Anchors for Primary Supports in Coal Mines. 25th International Conference on Ground Control in Mining. U.S.A.
Mining engineering Active current injection method for limiting ground fault current harmonics in underground coal mines UNIVERSITY OF KENTUCKY Joseph Sottile ZhangYigongCurrent practice in U.S. underground coal mine high-voltage distribution systems is to attempt to limit ground fault current to 25 ...
This report presents the results of a three-phase investigation of the feasibility of using cemented coal waste in active underground coal mines to prevent mine subsidence. Coal waste was broadly defined to include waste from both coal preparation plants and coal-fired powerplants. Underground ...
This paper introduces ActiveGCN-CT, a novel graph convolutional network (GCN) model enriched with an active learning strategy, tailored for active source computational tomography (CT) inversion in coal mines. The research shows that the magnitude of stress in coal bodies is generally positively ...