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Published 09:47 6 Aug 2021 BST
Updated 09:47 6 Aug 2021 BST

In 1984, there were 170 working coal mines in Britain, employing more than 190,000 people. However, by 2015 they had all closed.
Mrs Thatcher's announcement that she planned to close 20 of them, led to the infamous year-long miners' dispute, with millions protesting and violent clashes taking place between striking miners and police.
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