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Bradford Colliery was a coal mine in Bradford, Manchester, England. Although part of the Manchester Coalfield, the seams of the Bradford Coalfield correspond more closely to those of the Oldham Coalfield. The Bradford coalfield is crossed by a number of fault lines, principally the Bradford Fault, which was reactivated by mining activity in the mid-1960s. Coal had been mined at Bradford since at least the early 17th century, when the area around the pits was largely rural; it became increasingly built-up and industrialised as nearby Manchester expanded during the 19th century. Coal was transported from the colliery by canal and railway, but most was consumed locally by the adjacent Bradford Ironworks. In the mid-20th century a 469-yard (420 m) underground tunnel was dug to supply coal directly to the Stuart Street Power Station. Damage to buildings in the area around the colliery caused by subsidence led to it becoming uneconomic despite its sitting on large reserves of high-quality coal, and it was closed in 1968. The site was cleared and is now occupied by the City of Manchester Stadium. ==Geology== The Bradford Coalfield is isolated from the rest of the Manchester Coalfield; its coal seams, laid down in the Carboniferous period, dip at an average of 1 in 3 towards the south and correspond more closely with those of the Oldham Coalfield. The Upper Coal Measures above the Worsley Four Foot mine horizon were worked at Bradford, where the Worsley Four Foot is known as the Parker mine. The Two Foot, Doctor, New, Yard, Bradford Four Foot, Three Quarters and Charlotte mines, above the Parker mine, are known as the Bradford Group; the Charlotte mine is closest to the surface. The Openshaw mine, above the Charlotte, was worked for fireclay. Below the Bradford Group and the Parker mine are the Top, Middle and Deep mines, and below them, the Roger mine. The Top, Middle and Deep mines correspond to the Major, Bland, and Ashton Great mines in the Oldham Coalfield. The Crombouke mine in the western coalfield corresponds to the Roger mine at Bradford Colliery. In total the workable seams contained 310 million long tons (347 million short tons) of coal. The Bradford Coalfield is crossed by a number of fault lines, principally the Bradford Fault. The extraction of coal caused that fault to reactivate in the 1960s, resulting in a scarp that seriously damaged Crompton Hall, a residential complex built in the early 20th century. The building was subsequently demolished. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bradford Colliery」の詳細全文を読む スポンサード リンク
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