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 initiated the excavation of salt mines and the establishment of salt production facilities north-west of Northwich. The development of Platt's Hill Mine in Wincham by John Thompson in 1843 was soon followed by the creation of the Dunkirk Works in Witton-cum-Twambrooks.