 The first stage of redevelopment was completed in 1957 at a cost of c. 400 million Deutschmarks, giving a capacity of c. 600,000 tons steel pa. Facilities included three open hearth steelmaking furnaces, a hot rolling mill for coil and sheets, and a tinplate plant.In 1960 the board at Klöckner authorised a second phase (200 million Deutschmarks) to increase capacity to 1 million tons.In 1960 the ultimate aim was to develop the site as a full steel mill with a production capacity of 4 to 5 million tons of steel pa. By the 1960s the workforce had risen to 6,000 – many of the new workers were immigrants, predominately from Turkey.