They began to sink salt mines and start salt works north-west of Northwich. Platt’s Hill Mine, Wincham, was sunk by John Thompson in 1843, and in 1846 was followed by the Dunkirk Works, in Witton-cum-Twambrooks.
They started to dig salt mines and establish salt factories northwest of Northwich. Platt's Hill Mine, Wincham, was excavated by John Thompson in 1843, followed by the Dunkirk Works in Witton-cum-Twambrooks in 1846.