One of the pits sunk in the late nineteenth century was the Elliot Colliery. At its peak before World War I, it was producing over a million tons of coal a year and employing nearly three thousand people. The coal eventually became depleted and the colliery closed in 1967. Most of the site was cleared but the East Winding House survives and is now a Grade II listed building, and a museum of the coal industry in the area has been opened on the site. All the pits in the valley were closed by the end of the twentieth century; the spoil heaps were removed and the area was landscaped so that it is not now apparent that the valley ever had an industrial past.