were often accommodated in the runofmine design. Designs for coal, gold and diamond open pits are very similar. Water is collected at the lowest point in the open pit or underground mine, then pumped to surface. However, where profit is sensitive to the cost of extraction of water, there are often innovations, notably in the coal mining ...

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Mining in the vicinity of large bodies of water, below a worked out coal seam or under confined aquifer or abandoned water logged workings is always fraught with the possibility of the danger of ...

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Mining Methods. Underground coal mining encompasses two principal methods, of which many variations have evolved to address mining conditions in individual operations. Roomandpillar extraction involves mining tunnels (or roadways) on a regular grid, often leaving substantial pillars for longterm support of the roof.

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