From Guinness Book of Records 1974, p.134: "Mines: United Kingdom. The all-time record depth is 4,132 ft (1,259 m) in the Arley Seam of the Parsonage Colliery, Leigh, Greater Manchester in Feb. 1949. The record in Scottish coalmines was 3,093 ft (942 m) in the Michael Colliery, Barncraiog, Fife, reached in August 1939. The deepest present mine workings are the Hem Heath Colliery (Moss Seam), Trentham, Staffordshire, England at 3,300 ft (1,005 m). The deepest in Scotland is the Great Seam at Monkton Hall Colliery, Millerhill, Midlothian at 2,930 ft (893 m). The deepest eve shaft in England, is that of the Cleveland Potash Ltd. at Boulby, North Yorkshire at 3,754 ft (1,144 m) completed in February 1973 and the deepest in Scotland was Monkton Hall No.1, Midlothian at 3,054 ft (930 m). The deepest Cornish tin mine was dolcoath mine, near Camborne. The William shaft was completed in 1910 to 550 fathoms (3,300 ft [1,005 m]) from adit or approximately 3,600 ft (1,097 m) from the surface."