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In page Sunderland:

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Rapid growth of the port was initially prompted by the salt trade.[4] Salt exports from Sunderland are recorded from as early as the 13th century, but In 1589, salt pans were laid at Bishopwearmouth Panns (the modern-day name of the area the pans occupied is Pann's Bank, on the river bank between the city centre and the East End).[6] Large vats of seawater were heated using coal; as the water evaporated the salt remained. As coal was required to heat the salt pans, a coal mining community began to emerge. Only poor quality coal was used in salt panning; better quality coal was traded via the port, which subsequently began to grow.[7]