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Grimes Graves is a large Neolithic flint mining complex near Brandon in England close to the border between Norfolk and Suffolk. It was worked between around 2300 BC and 1800 BC, when the growing prevalence of bronze tools rendered its products obsolete. It extends over an area of more than 20 ha (0.2 km² / 50 acres) and consists of almost 400 shafts dug into the natural chalk to reach seams of flint.