Flint mining took place at Cissbury Hill during the Neolithic period long before the construction of the hill fort. Thanks to Victorian archaeologists we know that there are substantial surviving underground shafts and galleries here. In the 1970s radiocarbon dating on material from all Britain’s flint mines showed that mines in Sussex were the earliest in the country.
https://web.archive.org/web/20201126103442/https://www.nationaltrust.org.uk/cissbury-ring/features/neolithic-flint-mines-at-cissbury-ring (archive link)
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