Artificial intelligent assistant

coal-mine

ˈcoal-mine
  A mine in which coal is worked or dug, a coal-pit or colliery.

1613 Lanc. & Chesh. Wills (1884) 159 The yssues..of one Cole myne. 1853 W. Gregory Inorg. Chem. 156 The frightful accidents..so common in coal-mines.

  So coal-miner, coal-mining.

1639 R. Junius Sinne Stigmatizd 295 Like..Coleminers..when the candles burning blew, tells the dampe commeth. 1854 Encycl. Brit. VII. 123/1 The uninitiated in coal mining. 1880 All Y. Round No. 55. 102 Coal-miners are under inspection. 1887 Times (weekly ed.) 30 Sept. 13/4 The extent of the coal-mining industry in Great Britain.

Oxford English Dictionary

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