Surface mining is used for about 40% of coal production in the world. ... Methods of Coal Mining. This method is the one of the most dangerous mining method as it ...
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Surface mining is used for about 40% of coal production in the world. ... Methods Of Coal Mining ... Retreat mining method uses pillars or coal ribs to hold up the ...
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Switch to proposed mining method unlocks value; ... expected to underpin the first phase of production from our Polish coal ... World Coal; World ...