Geophysical studies in occurrences of polymetallic minerals (Au, Cu, Pb, Zn, Sn, Cr), generation and flow of acid mine drainage in tailings and open pit, analysis of hydrogeological conditions in geotechnical stability in open pit mine, infiltrations in tailings dams, studies of the ecological function of wetlands in the hydrogeological cycle, analysis of recharge in fractured and porous aquifer systems, erosive processes and piping in tropical soils, contaminations in soils and rocks