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coal formation and mining

As mining advances a gridlike pattern of rooms and pillars is formed When mining reaches the end of a panel or the property line retreat mining begins In retreat mining the workers mine as much coal as possible from the remaining pillars until the roof begins to fall in aka third mining or ‘robbing the pillars’ When retreat mining is completed the mined area is abandoned... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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