Hydraulic mills were introduced in the early colonial period in the Americas to grind wheat into flour. During the nineteenth and twentieth centuries, the rise of the agro-export model in Latin America shaped the development of a flour industry in which water-powered mills played a central role. Over time, these technologies were used not only to increase production for the export market but also to meet the needs of domestic consumption, both local and regional. In this context, in 2017 we began to investigate the characteristics of a hydraulic mill, currently in disuse, in the town of Payogasta in the province of Salta (Argentina), to determine its chronology and functionality. In addition to surveying the structure, we conducted excavations in the nearby rooms that were part of the site. We found that this mill was in operation between the end of the nineteenth and the end of the twentieth centuries, grinding wheat, corn, carob, and red bell pepper, and that the adjoining rooms were used to house the people who were waiting their turn to grind their raw materials.
