FILE - In this Oct. 15, 2014 photo, coal miners return on a buggy after working a shift underground at the Perkins Branch Coal Mine in Cumberland, Ky. As recently as the late 1970s, there were more than 350 mines operating at any given time in Harlan County. In 2014, it's around 40. (AP Photo/David Goldman, File) - David Goldman | AP

FILE – In this Oct. 15, 2014 photo, coal miners return on a buggy after working a shift underground at the Perkins Branch Coal Mine in Cumberland, Ky. As recently as the late 1970s, there were more than 350 mines operating at any given time in Harlan County. In 2014, it’s around 40. (AP Photo/David Goldman, File)

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