In 1984, the Yorkshire area had a total of 56 collieries.
The last deep coal mine was Kellingley Colliery which closed on Friday 18 December 2015 signalling the end of deep coal mining not only in Yorkshire but in Britain as a whole.
[1] Hatfield Colliery closed in mid 2015.
The Yorkshire Area of the Coal Board also included Manton and Shireoaks collieries, which were geographically in Nottinghamshire; they closed in 1994 and 1990 respectively.
BBC News.