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pillar extraction |
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pillar extraction [′pil·ər ik′strak·shən] (mining engineering) Removal of the pillars of coal left over from mining by the pillar-and-stall method. Also known as pillar mining. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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