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In page Wirral Peninsula:

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The excavation of the New Cut of the Dee, opened in 1737, to improve access to Chester, diverted the river's course to the Welsh side of the estuary and took trade away from the Wirral coastline.[3] Although plans were made to overcome its gradual silting up, including one in 1857 to cut a ship canal from a point between Thurstaston and Heswall to run along the length of Wirral to Chester, this and other schemes came to nothing, and the focus of general trade moved irrevocably to the much deeper Mersey. However, from the late 18th century there was coal mining near Neston, in tunnels stretching up to two miles under the Dee, and a quay at Denhall was used for coal exports.[1]