This paper fills a gap in recent literature on productivity and regional development by examining the determinants of productivity in primary industries in English regions during the Middle Ages. It provides a comprehensive review of relevant literature on the tin, lead and silver mining industries in Medieval England. Modern studies of productivity typically focus on technology, labour skills, unionization and regional economic infrastructure as key determinants of productivity growth and focus on high‐technology manufacturing industries This study of medieval mining, however, focuses on extractive industries in which advanced technologies played only a limited role. The paper shows that alternative factors contributed to the productivity of medieval mining including royal policy, the location of deposits and fluctuations in demand. Technology, investment in training and worker activism had, in contrast, little impact.