- Mineral Resources 25
- Energy Policy, Economics and Management 12
- Industrial Chemistry/Chemical Engineering 12
- Industrial and Production Engineering 12
- Geology 7
- Mineralogy 5
- Fossil Fuels (incl. Carbon Capture) 4
- Geography, general 4
- Mathematical Modeling and Industrial Mathematics 4
- Statistics for Engineering, Physics, Computer Science, Chemistry and Earth Sciences 4
- Sustainable Development 4
- Ecotoxicology 3
- Hydrogeology 3
- Industrial Pollution Prevention 3
- Water Quality/Water Pollution 3
- Crystallography and Scattering Methods 1
- Earth Sciences, general 1
- Geochemistry 1
- Geophysics/Geodesy 1
- Geotechnical Engineering & Applied Earth Sciences 1