 Harvey's Foundry was established in 1779 at the head of Penpol Creek by John Harvey to serve local mines.Harvey's built South Quay in 1819 which increased silting in shipping channels; a problem initially resolved by impounding Copperhouse Pool.Carnsew Pool was created in 1834 to impound tidal water, following the building of East Quay by the Cornish Copper Company, which caused the deep water channels used by Harvey's to fill with silt.