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<p>Shaft sinking for the extraction of minerals has taken place for centuries, and for much of this time, coal mining was carried out in the North East of England. Various methods of pit sinking developed from the use of shallow bell pits to the excavation of deep shafts, in order to access rich seams of coal and other minerals for sale in rapidly urbanising areas such as London. In the close mining communities of Northumberland and Durham, those...Seguir leyendo