The OHM-BMP was created under the initiative of the CNRS/INEE and was attached to the ECCOREV Federation to promote a new form of scientific interdisciplinarity in order to address the question of human-environment interactions in a zone characterized by major human impacts: that of the reconversion of the mining basin after its closure. Each of the disciplines that make up OT-Med is involved: biology, economics, history, sociology, environment, health, geography, ecology and law. The OHM promotes exchange and interaction, and maintains relations with the region’s different stakeholders (local authorities, companies, government departments, etc.). The activities have been divided into four main areas: Research, Information Systems, Animation and Administration. In particular, the OHM organises and manages information systems and a database with a view to capitalising knowledge and supporting research projects. To date, the network comprised 35 individual partners, nine research units and seven institutional partners. Their research was primarily dealing with soil use in urban fringes, atmospheric pollution, slag-heap biodiversity and risk as perceived by the population. This observatory is an important member of the new labex DRIIHM.