1969 United Kingdom miners' strike
An unofficial miners' strike took place in the United Kingdom in 1969, involving 140 of the 307 collieries owned by the National Coal Board, including all collieries in the Yorkshire area. The strike began on 13 October 1969 and lasted for roughly two weeks, with some pits returning to work before others. The NCB lost £15 million and 2.5 million tonnes of coal as a result of the strike.