coal mine

noun
a mine or pit from which coal is obtained.

Origin:
1605–15

coal miner, noun
coal mining, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The fossil snake bones were found in an open-pit coal mine, along with its
  prey, which included turtles and crocodiles.
In addition there have been many lives lost due to coal mine explosions,
  collapses and other energy accidents.
Coal mine accidents grab the major headlines, and ravages of the land are
  visible and dramatic.
See pictures of a coal mine's attempt to clean up its image.
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