History of Northwich in the early medieval period is shown by its record in the Domesday Book: It shows that by 1086 the town was producing salt and was valued the same as Middlewich at £8, although less than the £21 value given to Nantwich. It is unclear if salt extraction had continued from the Roman to Medieval periods. The manor of Northwich belonged to the Earls of Chester. However, in 1237 the family line died out. Subsequently, Northwich became a royal manor and was given to a noble family to collect tolls in exchange for a set rent. By 1484 this family
Mining engineering and management, or as an equipment and mineral salesperson. In addition to engineering and operations, the <nowiki>mining engineer</nowiki> may work as an environmental, health and safety manager or design engineer. The act of mining required different methods of extraction depending on the mineralogy, geology, and location of the resources. Characteristics such as mineral hardness, the mineral stratification, and access to that mineral will determine the method of extraction. Generally, mining is either done from the surface or underground. Mining can also occur with both surface and underground operations taking place on the same reserve. Mining activity varies as to what