<https://www.derelictplaces.co.uk/threads/bonsall-leys-lead-workings-derbyshire-april-2021.38181/>
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"1. The History\nThe Bonsall Leys are small-scale lead workings situated in Derbyshire where lead mining first took place back in the 1540s when it was called Whitelow mines. Extraction of the lead ore, called galena, was done through the use of..."
<https://www.derelictplaces.co.uk/threads/bonsall-leys-lead-workings-derbyshire-april-2021.38181/>