Coal was discovered in Kentucky in 1750. Since the first commercial coal mine opened in 1820 coal has gained both economic importance and controversy regarding its environmental consequences. As of 2010 there were 442 operating coal mines in the state,[1] and as of 2017 there were fewer than 4,000 underground coalminers.[2]
- ^ "Online KY Coal Facts". Coaleducation.org. Archived from the original on 2012-03-03. Retrieved 2012-08-17.
- ^ I.K. (10 October 2017). "Scott Pruitt signs a measure to repeal the Clean Power Plan". The Economist.
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