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The dilution factor for block caving can be from 10% to 25% of the total ore drawn With stoping methods and room and pillar mining, 15 to 25% of the ore is often left in supporting pillars Underground coal mining recovers an average of 50% of the coal with the room and pillar system and up to 80% using the longwall method [2], [5], [10]...

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Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef or placer depositThese deposits form a mineralized package that is of economic interest to the miner Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay...

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