[Fabricació del ciment Portland a Castellar de N'Hug]

Documentary about the Portland cement manufacturing factory of the company Asland in Castellar de N'Hug. A view of the factory is shown. Images of the source of the Llobregat, its dam and its waterfall, as well as the route of the large pipe that transports the water. Long shot of the area. The process of creating cement is shown: extraction of mineral, processing and chemical controls. Details of machinery, workers and facilities, including housing for workers, school, cottage for managers. Images of the railroad that connects the factory with Guardiola de Bergueda. Footage of the entrance to the mines and the miners.