Question

What are the pillars of rocks which are left standing in the open water called?​

Answer 1

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A common open-stoping method is room-and-pillar mining, in which pillars of ore are left standing to support the rock over a flat-lying ore body.

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Answer 2

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⇛ A common open-stoping method is room-and-pillar mining, in which pillars of ore are left standing to support the rock over a flat-lying ore body.

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