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Learn more2018830Open cast coal mining recovers a greater proportion of the coal deposit than underground methods as more of the coal seams in the strata may be exploited Most coal seams are too deep underground for opencast mining and require underground mining a method that currently accounts for about 60 percent of world coal production In deep mining .
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Learn more201955This statistic shows the coal rents as a percentage of the GDP in Malaysia from 2006 to 2016 In 2016 the coal rents in the country amounted to approximately 001 percent of the GDP a decrease .
Learn moreOpencast coal mining at Kriel Colliery98 Once this fact was accepted use was made of the concept of average stripping ratio which required the dragline to dig in the same cut in relatively shallow overburden as well as in overburden as deep as 40 m which is accepted at present as the limit of opencast mining.
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