Haig Colliery was a coal mine in Whitehaven, Cumbria, in north-west England. The mine was in operation for almost 70 years and produced high volatile strongly caking general purpose coal which was used in the local iron making industry, gas making and domestic fires. In later years, following closure of Workington Steelworks in 1980, it was used in electricity generation at Fiddler's Ferry. Situated on the coast, the underground workings of the mine spread westwards out under the Irish Sea and mining was undertaken at over 4 miles (6.4 km) out underneath the sea bed.