1. Royal Belgian Institute of Natural Sciences‐Geological Survey of Belgium Brussels B‐1000 Belgium
2. The Mineral Resources Expert Group (MREG), EuroGeoSurveys Brussels B‐1000 Belgium
3. Université de Lorraine, CNRS, CRPG Nancy F‐54000 France
4. GeoRessources Lab, Université de Lorraine, CNRS Nancy F‐54000 France
5. Department of Geodynamics and Geomaterials Research, Bavarian Georesources Centre Institute of Geography and Geology, University of Würzburg Würzburg D‐97074 Germany
6. Department of Geology and Applied Geology University of Mons Mons B‐5000 Belgium