Historically a part of Lancashire; during the Industrial Revolution Wigan experienced dramatic economic expansion and a rapid rise in the population. Although porcelain manufacture and clock making had been major industries in the town, Wigan has since become known as a major mill town and coal mining district. The first coal mine was established at Wigan in 1450 and at its peak there were 1,000 pit shafts within of the town centre. Mining was so extensive that one of its town councillors once remarked that "a coal mine in the backyard was not uncommon in Wigan". Coal mining ceased during the latter part of the 20th century. In 1974, Wigan became a part of Greater Manchester.