Salt panning was a very important industry in the early history of Prestonpans. By the beginning of the fifteenth century there were 10 salt works belonging to the town capable of producing between 800 and 900 bushels of salt per week. However, Prestonpans was not a one-industry town, and many other industries flourished in Prestonpans and contributed towards the town's growth. The discovery and mining of coal by the Newbattle monks in the early thirteenth century was arguably the first instance of coal mining in Britain. The mining of coal in Prestonpans began in the year 1210, and continued for centuries.