Darton Colliery (also marked as Swallow Hill Colliery) is known from 1869 but it didn’t reach a large scale which impacted significantly these fields until the late 20th century. The colliery was amalgamated with North Gawber Colliery in 1948 (Gill 2007b). The large spoil heap remains so legibility is significant. The colliery spoil heap leaves no legibility of the former strip fields which characterised this area. They were probably enclosed from the medieval open fields around Darton and Mapplewell.