The concentration of inorganic chemical substances released into surface water from Okaba coal deposit were measured using spectroscopic techniques in order to assess the extent of pollution. Parameters measured (Pb, Fe, Cu, Cr, SO42-, Cl-, Mn, Zn and pH) showed that water samples within the mine area contain Pb, Fe, Cr, Cl-, Mn and Zn in concentrations beyond permissible intake limits; and the concentration of chloride measured (3000 mg/L) is capable of causing acid mine drainage (AMD). Concurrent evaluation of these inorganic substances using quantitative assessment reveal the possible presence of trace minerals like galena, sphalerite, chalcopyrite, pyrite and clay in Okaba coal deposit. Keywords— Acid mine drainage (AMD), Coal, Trace minerals, Water pollution