The Iron and Steel Industry in Scunthorpe was established in the mid 19th century, following the discovery and exploitation of middle Lias ironstone east of Scunthorpe, Lincolnshire, England. Initially iron ore was exported to iron producers in South Yorkshire. Later, after the construction of the Trent, Ancholme and Grimsby Railway (1860s) gave rail access to the area local iron production rapidly expanded using local ironstone and imported coal or coke. The local ore was relatively poor in iron (around 25% average) and high in lime (CaCO3) requiring co-smelting with more acidic silicious iron ores. The growth of industry in the area led to the development of the town of Scunthorpe in a formerly sparsely populated entirely agricultural area.