1973 Dumping waste rocks outside opencast coal mine causing instability of top soil benches of quarry
DOI:
https://doi.org/10.17159/Abstract
One of the consequences of large scale opencast mining for coal is the disposal of an enormous volume of overburden material that needs to be removed. With the enlargement of opencast mines and the high stripping ratio associated with these mines, the volume of overburden extraction is rising heavily. Overburden (O.B) from the initial mine cut has to be necessarily dumped outside the mining area till enough void is created inside the mine for back-filling operations. The quantity of overburden put outside the mining area normally varies from 10 to 30% of the total O.B removal. The stability of these dumps placed outside the mining area is of prime importance from the point of view of smooth operation of the mines and safety of the persons in and around the dumping area. Due to increasing pressure on land use, mine operators do not have any other option other than putting waste dump very near to the surface edge of the quarry which may lead to the failure of top soil benches of working quarry. This paper identifies major controlling parameters influencing stable but economic combination of height and slope angle of external dumps located close to the quarry.Downloads
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