Kellingley Colliery, known affectionately as the 'Big K',[1] was a deep coal mine in North Yorkshire, England, 3.6 miles (5.8 km) east of Ferrybridge power station.

After a concrete lining sealed the shafts, the cooling brine was stopped and the frozen ground allowed to thaw.

Grout, a thin cement mixture, was pumped at high pressure through holes bored through the shaft's concrete lining into the water-bearing strata.

Many of the miners relocated from Scotland to work at the colliery, having lost their jobs at Scottish pits that closed in the 1960s.

[9] In 1990 and 1991, the proposed extension to the colliery necessitated the excavation and underpinning of the nearby Church of St Edmund King and Martyr, Kellington.

[14] Kellingley Colliery closed on 18 December 2015, marking the end of deep mining in the United Kingdom.

[17] The shafts of the colliery were emptied of cables and ropes and then filled with a concrete block about 10 metres deep.

Demolition started on the surface buildings and the site was levelled out before ownership is transferred to Harworth Estates for future redevelopment.

[18] On Saturday 19 December 2015, thousands of people turned out for a march in Yorkshire to commemorate the end of deep coal mining in the UK and, specifically, Kellingley's last shift the day before.

[20] The site is intended for future phased development over a 10-year plan into commercial units to nurture employment opportunities.