At the side of the footpath leading across fields from Bradwell to Brough it is possible to see sections of an old and arched stone tunnel topped with turf which in places has collapsed. These are the remains of a flue running from the former Brough White Lead Works to a tower further up the hillside. Constructed around 1860, the smelting works were operated day and night and used a Dutch process to produce refined white, grey and red lead. In 1854 it is recorded that four men were killed in the Bradwell area by poisonous fumes from a smelter when a pump engine failed. The works closed in 1924 and a tower which was a local landmark was demolished during the Second World War as it posed as a conspicuous marker for the nearby cement works.