Opencast mining dominates coal production in India. A survey was conducted to evaluate its local atmospheric impact. ... The results show that both wave patterns undergo "rolling" + "lifting" during the dust lifting process. The difference is that the dust layer is first pressed and then lifted in the case of spherical waves, while the ...
The technology for opencast lignite mining is noted for its high production efficiency, high level of recovery and lower risk as regards the safety of workers when compared with underground mining systems. ... The authors concluded that mined land reclamation is an important process in opencast coal mine production; however, it was rarely ...
Opencast coal mining in India: Analyzing and addressing the air environmental impacts Mrinal K. Ghose First published: 04 April 2007 https://// Citations: 8 PDF Tools Share References Citing Literature Volume 16, Issue 3 Spring 2007 Pages 7187 References Information
opencast coal mines is an essential application in previous studies. Caro explored the relationship between surface deformation and subsurface water levels to provide rough
Surface mining consumes land; land reclamation is the process of returning minedthrough land to an environmentally and socially acceptable state. Unfortunately, as in the recycling of other ...
In particular, we analyzed the dynamic change process of land use in typical openpit coal mines from 2001 to 2020, identified the reasons for the spatial changes in land use, and put forward policy recommendations for the optimization of land mining and reclamation in mining areas. ... Mukherjee S., Pahari Underground and Opencast Coal ...
The last operating opencast mine in the UK, which produces around twothirds of the country's coal, has closed amid concerns that it could be left abandoned. The FfosyFran pit in Merthyr Tydfil has produced nearly million tonnes of coal since opening in 2008, and is responsible for 86% of the UK's total coal output.
Define opencast mining. opencast mining synonyms, opencast mining pronunciation, opencast mining translation, English dictionary definition of opencast mining. n Brit mining by excavating from the surface. ... opencast mining the mining of ore or coal from an open mine. strip mining. mining, excavation the act of extracting ores or coal etc ...
Such work provides a theoretical foundation and technical support for systematic research on the process of land reclamation in large opencast coal mines (Song et al., 2020). In general, the important roles of monitoring and evaluating the land reclamation effects at different stages in guiding the ecological restoration of degraded mining ...
Opencast coal mining activities result in severe degradation of land resources and ecological environment (Wang et al. 2016).In the process of opencast mining, topsoil overlying the coal are stripped and deposited on damlike dump with largescale heavy machinery (Krummelbein et al. 2010).The compaction effects are intensified by the large tires of crawlers and dump trucks going back and forth.
Opencast mining operations involve the removal of huge quantities of overburden, dumping, and backfilling of the excavated area. These overburden deposits of waste material containing lowgrade ores are represented as mine spoil dumps.
The reclamation of surface (opencast) coal mines is not always successful; there remains a legacy of degraded land that burdens local communities. This article evaluates a communityoriented, lowcost means of geoecological regeneration, the "Cradle for Nature" strategy, which uses mosaic tree planting to foster positive natural ecological processes. Results show that, while the ...
OPENCAST MINING definition: the activity of taking minerals, especially coal, from the surface of the ground rather than from.. Learn more.
In the coal mining process, elemental pollution is one of the most important environmental issues (Mileusnic et al., 2014). During the process of opencast and underground coal mining, various types of rocks and rock dusts with varied compositions are subjected to atmospheres and engage in accelerated weathering (Bhuiyan et al., 2010).
Longwall mining involves the full extraction of coal from a section of the seam, or 'face' using mechanical shearers. The coal 'face' can vary in length from 100350m. Selfadvancing, hydraulicallypowered supports temporarily hold up the roof while coal is extracted. When coal has been extracted from the area, the roof is allowed to ...
This study therefore investigated the pollution of surface soils surrounding 135 large opencast coal mining pits in China. A total of 1772 surface soil samples were collected, and the concentrations of eight major HMs were determined. The HM concentrations in this study were relatively lower than the published HM concentrations of coal mine ...
opencast mining Stripping surface layers from the Earth's crust to obtain coal, ores or other valuable minerals. Dragline excavators strip away surface layers and mechanical shovels distribute minerals and spoil. The minerals are carried away for grading and processing. In some countries, owners of opencast mines are required to restore the environmental quality of the land after mining has ...
Open Cast Mining. Open cast mining is usually associated with coal or other tabular deposits that are more or less flatlying. A significant difference between open pit and open cast mining methods is that in open cast mining, overburden that is removed to gain access to the ore is immediately placed in the previously mined cut.
The opencast coal mining complex extends. over two mines within the Witbank Coalfield, ... These sumps required a mud loading process prior to mining the coal below the sequence. The mud loading ...
The change process of land use in the region reveals the internal human driving mechanism of its evolution. Therefore, the change of land use can intuitively and objectively reflect the intensity and progress of mining activities in the opencast mining area. Inside the mining area, largescale exploitation of coal resources will lead to rapid ...
Coal mining is the process of extracting a coal reserve from the ground. As a commodity, coal is valued for its energy content and since the nineteenth century has been widely used to generate electricity and as a fuel source for the steel and cement industries. ... Opencast coal mining recovers a greater proportion of the coal deposit than ...
Abstract. Coal mining contributes to economic development, but has an immense impact on the quality of the environment. Soils near coal mines may get contaminated by the dispersion of coal particles and dust from the mines. Soil samples were collected near an opencast coal mine (OCM) in Dhanbad, India.
The opencast coal mining technique is used in areas were the coal reserves are scattered in shallow and thin seams and cannot be extracted by deep mining methods (Beynon et al., 2000). The opencast process starts with exploration activities to identify where there are deposits of coal and what is the depth of the seams.
But open cast coal production moved in an increasing scale for development of higher capacity Heavy Earth Moving Machinery (HEMM) in the globe and its adoption in Indian Coal Mining Industry. In ...
Opencast mining is regarded as one of the most dramatic disturbances in terrestrial ecosystems. Opencast coal mining leads to the destruction of local ecological environment and the loss of natural conditions (Milder et al. 2013 ).
The mineable and partially mineable seams in the mining area are 5 #, 6 #, and 9 #. Of the three coal seams, 5 # is partially mineable. As for 9 # coal seam, its mining authority is restricted within the scope of mineral rights. Therefore, 6 # composite seam is the main mining area with an average thickness of m.
Surface coal mining in the steep terrain of the central Appalachian coalfields includes: auger mining. scattered areas of eastern Tennessee. removing parts or all of mountaintops to expose buried seams of coal, and. "interburden" (rock between coal seams). Overburden and interburden are disposed of in adjacent valleys because the broken rock ...
The Piparwar opencast mine in Jharkhand was once the largest coalproducing mine in the state and had damaged the local ecology. Now, after about 30 years of mining operations being started, the staterun Central Coalfields Limited (CCL), is carrying out reclamation and restoration in a part of the original mining area, to make it suitable for public use.
Highwall mining is an adaptation of auger mining. Instead of an auger hole, an entry into the coal seam is made by a continuous miner, remotely operated from a cabin at the surface. The cut coal is transported by conveyors behind the miner to the outside. Using a television camera, the operator can see and control the miner's progress.
The coal industry serves a vital role in the nation's economy by producing fuel for more than half of its electricity. Despite the industry's importance, industry financial data for 2005—the strongest year for the coal industry in recent years—shows that it is a relatively small industry with revenues totaling 20 billion to 25 billion and net income between 1 billion and 2 ...
Openpit mining technology. Openpit mining clearly offers a number of economic advantages over underground mining, especially now that mineralprocessing technology has advanced to the stage where very lowgrade ores can be treated profitably. 100 to 150 years ago, this was not the case, and mining was still much more selective.
The opencast mining process mainly entails topsoil stripping, coal mining, coal transportation, solid waste disposal, and land reclamation (Fig. 3). First, the topsoil and rock are stripped from the surface covering the ore body. Then, the exposed ore body is mined directly.
Openpit mining. Some 53% of South Africa's coal is produced from surface mining, via opencast or openpit mines. This is because the coal is less than 60 metres below the surface. Openpit mines use draglines, as well as truck and shovel operations to extract coal. A dragline excavator uses a dragline to pull a bucket by a wire cable.
In order to improve dust pollution control in opencast coal mines, this study combines prospect theory with evolutionary game theory, analyzing the evolutionary game process of coordinated governance activities of coal mining enterprises, local regulators, and social camps in the management of dust pollution against the backdrop of national supe...
Especially in the mining of opencast coal mines (FernandezManso et al., 2012; ... Based on the fluctuation analysis of the dynamic succession characteristics of NDVI time series images in the process of land reclamation in mining areas, the maximum synthesis method was used to synthesize the NDVI data in the vegetation growing season (May ...
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