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3 In determining "function," the court in Falcon Coal Co. v. Clemons, 873 F.2d 916, 12 BLR 2-271 (6th Cir. 1989), ruled that the worker's duties must be an "integral" or a "necessary" part of the coal mining process in order to meet the definition of minerGet Detail
As shallow coal resources are gradually depleted, resource exploitation extends from the shallow into the deep, where the mechanical properties of the coal rocks change significantly. To study the mechanical properties and mining-induced response characteristics of deep coal rocks. On a laboratory scale, laboratory tests and mining mechanics simulations were conducted on coal samples recovered ...Get Detail
In underground coal mining, samples of large blocks of undisturbed coal are taken to provide technical information on the strength and quality of the coal. These pillar samples are taken when a speciﬁc problem may have arisen or is anticipated. Such samples are taken in much the same way as whole-seam channel samples except that extra care is ...Get Detail
Jun 24, 2016· Coal mining destructs the structure of aquifer and results in the seepage of groundwater into the goaf (Wang et al., 2012, Xu et al., 2012). How to protect groundwater resource during coal mining is a big issue in northwestern China (Zhang and Peng, 2005, Gu et al., 2014). The Shendong mining area is located in east of Mu Us Desert in ...Get Detail
Mar 01, 2019· Break mass coal samples, select those with particle diameter below 0.5 mm, and placed in a dry place. (2) Evenly mix these samples with water at different ration according to experimental conditions. (3) Place the mixed coal samples into the chamber, impose the required load on the sample and keep for two hours. (4)Get Detail
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In this paper, an experimental study of the variation of resistivity of coal samples in different bedding directions at 1 MHz frequency was performed by establishing an experimental system for resistivity testing of coal under triaxial stress. The low-pressure nitrogen gas adsorption (LP-N 2 GA) experiment and scanning electron microscopy (SEM) were obtained to analyze the pore-fracture ...Get Detail
(A) Chest radiograph obtained after 24 years of coal mine employment showing category 3 simple pneumoconiosis with q- and r-type opacities. (B and C) Chest radiographs obtained after 32 and 35 years of coal-mining employment, respectively. Multiple, large, mass-like lesions and nodules in the bilateral upper lung fields, which coalesce further ...Get Detail
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Price v. Peabody Coal Co., 7 BLR 1-671 (1985). The Act defines a "miner" as: any individual who works or has worked in or around a coal mine or coal preparation facility in the extraction or preparation of coal. Such term also includes an individual who works or has worked in coal mine constructionGet Detail
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Coal quality parameters of greatest interest include ash, moisture, sulfur, and energy density (also known as heat content).Although most coal operations can obtain this information about coal quality by taking physical samples, preparing the samples, and analyzing them with laboratory equipment, these processes often involve a time lag of up to 24 hours from gathering the sample to final ...Get Detail
Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content and since the 1880s, has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production. In the United Kingdom and South Africa, a coal mine and its structures are a colliery, a coal mine – a pit, and the ...Get Detail
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