Kellingley Colliery is located at Knottingley in West Yorkshire. It is the biggest deep mine remaining in Yorkshire and as at 2009 employs approx 600 people.
With reserves of around 50 million tonnes the annual output for 2008 was around 1.2 Million tonnes.
Based on the results of exploratory boreholes sunk in the 1950s, it was established that up to seven workable seams of coal could be accessed from a new colliery, especially when it could be strategically located in the heart of a network of power stations.
Two main shafts were sunk nearly 800 metres deep, production began in April 1965.
The No 1 shaft (791m) is used for the man riding and materials whilst the No 2 upcast shaft (768m) is used for raising coal at a rate of up to 900 tonnes per hour. Currently the Silkstone seam (660 metres below ground) is being worked.
Kellingley produces both housecoal and power station quality coal.
Investment has been made to open new roadways thus giving access to new coal faces in the Beeston seam to the south and east of the current workings. As at 2009 development costs are set to be around £55 million.