From Longman Dictionary of Contemporary Englishcoal mineˈcoal mine (also coal pit British English) noun [countable] TPGa place from which coal is dug out of the ground —coal miner noun [countable]
Examples from the Corpus
coal mine• They used to live in the county of Saepiol in North Hamgyong, where the father worked in the Aoji coal mine.• Cerrejon is the second largest open pit coal mine in the world. 